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href="#using_npm">Using npm</a></li><li class="document-toc-item "><a class="document-toc-link" href="#installing_the_express_application_generator">Installing the Express Application Generator</a></li><li class="document-toc-item "><a class="document-toc-link" href="#summary">Summary</a></li><li class="document-toc-item "><a class="document-toc-link" href="#see_also">See also</a></li></ul></section></div></div><div class="sidebar-body"><ol><li class="section"><a href="/en-US/docs/Learn/Getting_started_with_the_web">Complete beginners start here!</a></li><li><details><summary>Getting started with the web</summary><ol><li><a href="/en-US/docs/Learn/Getting_started_with_the_web">Getting started with the web</a></li><li><a href="/en-US/docs/Learn/Getting_started_with_the_web/Installing_basic_software">Installing basic software</a></li><li><a href="/en-US/docs/Learn/Getting_started_with_the_web/What_will_your_website_look_like">What will your website look like?</a></li><li><a href="/en-US/docs/Learn/Getting_started_with_the_web/Dealing_with_files">Dealing with files</a></li><li><a href="/en-US/docs/Learn/Getting_started_with_the_web/HTML_basics">HTML basics</a></li><li><a href="/en-US/docs/Learn/Getting_started_with_the_web/CSS_basics">CSS basics</a></li><li><a href="/en-US/docs/Learn/Getting_started_with_the_web/JavaScript_basics">JavaScript basics</a></li><li><a href="/en-US/docs/Learn/Getting_started_with_the_web/Publishing_your_website">Publishing your website</a></li><li><a href="/en-US/docs/Learn/Getting_started_with_the_web/How_the_Web_works">How the web works</a></li></ol></details></li><li class="section"><a href="/en-US/docs/Learn/HTML">HTML — Structuring the web</a></li><li><details><summary>Introduction to HTML</summary><ol><li><a href="/en-US/docs/Learn/HTML/Introduction_to_HTML">Introduction to HTML</a></li><li><a href="/en-US/docs/Learn/HTML/Introduction_to_HTML/Getting_started">Getting started with HTML</a></li><li><a href="/en-US/docs/Learn/HTML/Introduction_to_HTML/The_head_metadata_in_HTML">What's in the head? Metadata in HTML</a></li><li><a href="/en-US/docs/Learn/HTML/Introduction_to_HTML/HTML_text_fundamentals">HTML text fundamentals</a></li><li><a href="/en-US/docs/Learn/HTML/Introduction_to_HTML/Creating_hyperlinks">Creating hyperlinks</a></li><li><a href="/en-US/docs/Learn/HTML/Introduction_to_HTML/Advanced_text_formatting">Advanced text formatting</a></li><li><a href="/en-US/docs/Learn/HTML/Introduction_to_HTML/Document_and_website_structure">Document and website structure</a></li><li><a href="/en-US/docs/Learn/HTML/Introduction_to_HTML/Debugging_HTML">Debugging HTML</a></li><li><a href="/en-US/docs/Learn/HTML/Introduction_to_HTML/Marking_up_a_letter">Marking up a letter</a></li><li><a href="/en-US/docs/Learn/HTML/Introduction_to_HTML/Structuring_a_page_of_content">Structuring a page of content</a></li></ol></details></li><li><details><summary>Multimedia and embedding</summary><ol><li><a href="/en-US/docs/Learn/HTML/Multimedia_and_embedding">Multimedia and embedding</a></li><li><a href="/en-US/docs/Learn/HTML/Multimedia_and_embedding/Images_in_HTML">Images in HTML</a></li><li><a href="/en-US/docs/Learn/HTML/Multimedia_and_embedding/Video_and_audio_content">Video and audio content</a></li><li><a href="/en-US/docs/Learn/HTML/Multimedia_and_embedding/Other_embedding_technologies">From object to iframe — other embedding technologies</a></li><li><a href="/en-US/docs/Learn/HTML/Multimedia_and_embedding/Adding_vector_graphics_to_the_Web">Adding vector graphics to the web</a></li><li><a href="/en-US/docs/Learn/HTML/Multimedia_and_embedding/Responsive_images">Responsive images</a></li><li><a href="/en-US/docs/Learn/HTML/Multimedia_and_embedding/Mozilla_splash_page">Mozilla splash page</a></li></ol></details></li><li><details><summary>HTML tables</summary><ol><li><a href="/en-US/docs/Learn/HTML/Tables">HTML tables</a></li><li><a href="/en-US/docs/Learn/HTML/Tables/Basics">HTML table basics</a></li><li><a href="/en-US/docs/Learn/HTML/Tables/Advanced">HTML table advanced features and accessibility</a></li><li><a href="/en-US/docs/Learn/HTML/Tables/Structuring_planet_data">Structuring planet data</a></li></ol></details></li><li class="section"><a href="/en-US/docs/Learn/CSS">CSS — Styling the web</a></li><li><details><summary>CSS first steps</summary><ol><li><a href="/en-US/docs/Learn/CSS/First_steps">CSS first steps</a></li><li><a href="/en-US/docs/Learn/CSS/First_steps/What_is_CSS">What is CSS?</a></li><li><a href="/en-US/docs/Learn/CSS/First_steps/Getting_started">Getting started with CSS</a></li><li><a href="/en-US/docs/Learn/CSS/First_steps/How_CSS_is_structured">How CSS is structured</a></li><li><a href="/en-US/docs/Learn/CSS/First_steps/How_CSS_works">How CSS works</a></li><li><a href="/en-US/docs/Learn/CSS/First_steps/Styling_a_biography_page">Styling a biography page</a></li></ol></details></li><li><details><summary>CSS building blocks</summary><ol><li><a href="/en-US/docs/Learn/CSS/Building_blocks">CSS building blocks</a></li><li><a href="/en-US/docs/Learn/CSS/Building_blocks/Selectors">CSS selectors</a></li><li><a href="/en-US/docs/Learn/CSS/Building_blocks/Selectors/Type_Class_and_ID_Selectors">Type, class, and ID selectors</a></li><li><a href="/en-US/docs/Learn/CSS/Building_blocks/Selectors/Attribute_selectors">Attribute selectors</a></li><li><a href="/en-US/docs/Learn/CSS/Building_blocks/Selectors/Pseudo-classes_and_pseudo-elements">Pseudo-classes and pseudo-elements</a></li><li><a href="/en-US/docs/Learn/CSS/Building_blocks/Selectors/Combinators">Combinators</a></li><li><a href="/en-US/docs/Learn/CSS/Building_blocks/Cascade_and_inheritance">Cascade, specificity, and inheritance</a></li><li><a href="/en-US/docs/Learn/CSS/Building_blocks/Cascade_layers">Cascade layers</a></li><li><a href="/en-US/docs/Learn/CSS/Building_blocks/The_box_model">The box model</a></li><li><a href="/en-US/docs/Learn/CSS/Building_blocks/Backgrounds_and_borders">Backgrounds and borders</a></li><li><a href="/en-US/docs/Learn/CSS/Building_blocks/Handling_different_text_directions">Handling different text directions</a></li><li><a href="/en-US/docs/Learn/CSS/Building_blocks/Overflowing_content">Overflowing content</a></li><li><a href="/en-US/docs/Learn/CSS/Building_blocks/Values_and_units">CSS values and units</a></li><li><a href="/en-US/docs/Learn/CSS/Building_blocks/Sizing_items_in_CSS">Sizing items in CSS</a></li><li><a href="/en-US/docs/Learn/CSS/Building_blocks/Images_media_form_elements">Images, media, and form elements</a></li><li><a href="/en-US/docs/Learn/CSS/Building_blocks/Styling_tables">Styling tables</a></li><li><a href="/en-US/docs/Learn/CSS/Building_blocks/Advanced_styling_effects">Advanced styling effects</a></li><li><a href="/en-US/docs/Learn/CSS/Building_blocks/Debugging_CSS">Debugging CSS</a></li><li><a href="/en-US/docs/Learn/CSS/Building_blocks/Organizing">Organizing your CSS</a></li><li><a href="/en-US/docs/Learn/CSS/Building_blocks/Fundamental_CSS_comprehension">Fundamental CSS comprehension</a></li><li><a href="/en-US/docs/Learn/CSS/Building_blocks/Creating_fancy_letterheaded_paper">Creating fancy letterheaded paper</a></li><li><a href="/en-US/docs/Learn/CSS/Building_blocks/A_cool_looking_box">A cool-looking box</a></li></ol></details></li><li><details><summary>Styling text</summary><ol><li><a href="/en-US/docs/Learn/CSS/Styling_text">CSS styling text</a></li><li><a href="/en-US/docs/Learn/CSS/Styling_text/Fundamentals">Fundamental text and font styling</a></li><li><a href="/en-US/docs/Learn/CSS/Styling_text/Styling_lists">Styling lists</a></li><li><a href="/en-US/docs/Learn/CSS/Styling_text/Styling_links">Styling links</a></li><li><a href="/en-US/docs/Learn/CSS/Styling_text/Web_fonts">Web fonts</a></li><li><a href="/en-US/docs/Learn/CSS/Styling_text/Typesetting_a_homepage">Typesetting a community school homepage</a></li></ol></details></li><li><details><summary>CSS layout</summary><ol><li><a href="/en-US/docs/Learn/CSS/CSS_layout">CSS layout</a></li><li><a href="/en-US/docs/Learn/CSS/CSS_layout/Introduction">Introduction to CSS layout</a></li><li><a href="/en-US/docs/Learn/CSS/CSS_layout/Normal_Flow">Normal Flow</a></li><li><a href="/en-US/docs/Learn/CSS/CSS_layout/Flexbox">Flexbox</a></li><li><a href="/en-US/docs/Learn/CSS/CSS_layout/Grids">Grids</a></li><li><a href="/en-US/docs/Learn/CSS/CSS_layout/Floats">Floats</a></li><li><a href="/en-US/docs/Learn/CSS/CSS_layout/Positioning">Positioning</a></li><li><a href="/en-US/docs/Learn/CSS/CSS_layout/Multiple-column_Layout">Multiple-column layout</a></li><li><a href="/en-US/docs/Learn/CSS/CSS_layout/Responsive_Design">Responsive design</a></li><li><a href="/en-US/docs/Learn/CSS/CSS_layout/Media_queries">Beginner's guide to media queries</a></li><li><a href="/en-US/docs/Learn/CSS/CSS_layout/Legacy_Layout_Methods">Legacy layout methods</a></li><li><a href="/en-US/docs/Learn/CSS/CSS_layout/Supporting_Older_Browsers">Supporting older browsers</a></li><li><a href="/en-US/docs/Learn/CSS/CSS_layout/Fundamental_Layout_Comprehension">Fundamental layout comprehension</a></li></ol></details></li><li class="section"><a href="/en-US/docs/Learn/JavaScript">JavaScript — Dynamic client-side scripting</a></li><li><details><summary>JavaScript first steps</summary><ol><li><a href="/en-US/docs/Learn/JavaScript/First_steps">JavaScript first steps</a></li><li><a href="/en-US/docs/Learn/JavaScript/First_steps/What_is_JavaScript">What is JavaScript?</a></li><li><a href="/en-US/docs/Learn/JavaScript/First_steps/A_first_splash">A first splash into JavaScript</a></li><li><a href="/en-US/docs/Learn/JavaScript/First_steps/What_went_wrong">What went wrong? Troubleshooting JavaScript</a></li><li><a href="/en-US/docs/Learn/JavaScript/First_steps/Variables">Storing the information you need — Variables</a></li><li><a href="/en-US/docs/Learn/JavaScript/First_steps/Math">Basic math in JavaScript — numbers and operators</a></li><li><a href="/en-US/docs/Learn/JavaScript/First_steps/Strings">Handling text — strings in JavaScript</a></li><li><a href="/en-US/docs/Learn/JavaScript/First_steps/Useful_string_methods">Useful string methods</a></li><li><a href="/en-US/docs/Learn/JavaScript/First_steps/Arrays">Arrays</a></li><li><a href="/en-US/docs/Learn/JavaScript/First_steps/Silly_story_generator">Silly story generator</a></li></ol></details></li><li><details><summary>JavaScript building blocks</summary><ol><li><a href="/en-US/docs/Learn/JavaScript/Building_blocks">JavaScript building blocks</a></li><li><a href="/en-US/docs/Learn/JavaScript/Building_blocks/conditionals">Making decisions in your code — conditionals</a></li><li><a href="/en-US/docs/Learn/JavaScript/Building_blocks/Looping_code">Looping code</a></li><li><a href="/en-US/docs/Learn/JavaScript/Building_blocks/Functions">Functions — reusable blocks of code</a></li><li><a href="/en-US/docs/Learn/JavaScript/Building_blocks/Build_your_own_function">Build your own function</a></li><li><a href="/en-US/docs/Learn/JavaScript/Building_blocks/Return_values">Function return values</a></li><li><a href="/en-US/docs/Learn/JavaScript/Building_blocks/Events">Introduction to events</a></li><li><a href="/en-US/docs/Learn/JavaScript/Building_blocks/Event_bubbling">Event bubbling</a></li><li><a href="/en-US/docs/Learn/JavaScript/Building_blocks/Image_gallery">Image gallery</a></li></ol></details></li><li><details><summary>Introducing JavaScript objects</summary><ol><li><a href="/en-US/docs/Learn/JavaScript/Objects">Introducing JavaScript objects</a></li><li><a href="/en-US/docs/Learn/JavaScript/Objects/Basics">JavaScript object basics</a></li><li><a href="/en-US/docs/Learn/JavaScript/Objects/Object_prototypes">Object prototypes</a></li><li><a href="/en-US/docs/Learn/JavaScript/Objects/Object-oriented_programming">Object-oriented programming</a></li><li><a href="/en-US/docs/Learn/JavaScript/Objects/Classes_in_JavaScript">Classes in JavaScript</a></li><li><a href="/en-US/docs/Learn/JavaScript/Objects/JSON">Working with JSON</a></li><li><a href="/en-US/docs/Learn/JavaScript/Objects/Object_building_practice">Object building practice</a></li><li><a href="/en-US/docs/Learn/JavaScript/Objects/Adding_bouncing_balls_features">Adding features to our bouncing balls demo</a></li></ol></details></li><li><details><summary>Asynchronous JavaScript</summary><ol><li><a href="/en-US/docs/Learn/JavaScript/Asynchronous">Asynchronous JavaScript</a></li><li><a href="/en-US/docs/Learn/JavaScript/Asynchronous/Introducing">Introducing asynchronous JavaScript</a></li><li><a href="/en-US/docs/Learn/JavaScript/Asynchronous/Promises">How to use promises</a></li><li><a href="/en-US/docs/Learn/JavaScript/Asynchronous/Implementing_a_promise-based_API">How to implement a promise-based API</a></li><li><a href="/en-US/docs/Learn/JavaScript/Asynchronous/Introducing_workers">Introducing workers</a></li><li><a href="/en-US/docs/Learn/JavaScript/Asynchronous/Sequencing_animations">Sequencing animations</a></li></ol></details></li><li><details><summary>Client-side web APIs</summary><ol><li><a href="/en-US/docs/Learn/JavaScript/Client-side_web_APIs">Client-side web APIs</a></li><li><a href="/en-US/docs/Learn/JavaScript/Client-side_web_APIs/Introduction">Introduction to web APIs</a></li><li><a href="/en-US/docs/Learn/JavaScript/Client-side_web_APIs/Manipulating_documents">Manipulating documents</a></li><li><a href="/en-US/docs/Learn/JavaScript/Client-side_web_APIs/Fetching_data">Fetching data from the server</a></li><li><a href="/en-US/docs/Learn/JavaScript/Client-side_web_APIs/Third_party_APIs">Third-party APIs</a></li><li><a href="/en-US/docs/Learn/JavaScript/Client-side_web_APIs/Drawing_graphics">Drawing graphics</a></li><li><a href="/en-US/docs/Learn/JavaScript/Client-side_web_APIs/Video_and_audio_APIs">Video and Audio APIs</a></li><li><a href="/en-US/docs/Learn/JavaScript/Client-side_web_APIs/Client-side_storage">Client-side storage</a></li></ol></details></li><li class="section"><a href="/en-US/docs/Learn/Forms">Web forms — Working with user data</a></li><li><details><summary>Web form building blocks</summary><ol><li><a href="/en-US/docs/Learn/Forms">Web form building blocks</a></li><li><a href="/en-US/docs/Learn/Forms/Your_first_form">Your first form</a></li><li><a href="/en-US/docs/Learn/Forms/How_to_structure_a_web_form">How to structure a web form</a></li><li><a href="/en-US/docs/Learn/Forms/Basic_native_form_controls">Basic native form controls</a></li><li><a href="/en-US/docs/Learn/Forms/HTML5_input_types">The HTML5 input types</a></li><li><a href="/en-US/docs/Learn/Forms/Other_form_controls">Other form controls</a></li><li><a href="/en-US/docs/Learn/Forms/Styling_web_forms">Styling web forms</a></li><li><a href="/en-US/docs/Learn/Forms/Advanced_form_styling">Advanced form styling</a></li><li><a href="/en-US/docs/Learn/Forms/UI_pseudo-classes">UI pseudo-classes</a></li><li><a href="/en-US/docs/Learn/Forms/Form_validation">Client-side form validation</a></li><li><a href="/en-US/docs/Learn/Forms/Sending_and_retrieving_form_data">Sending form data</a></li></ol></details></li><li><details><summary>Advanced web form techniques</summary><ol><li><a href="/en-US/docs/Learn/Forms/How_to_build_custom_form_controls">How to build custom form controls</a></li><li><a href="/en-US/docs/Learn/Forms/Sending_forms_through_JavaScript">Sending forms through JavaScript</a></li><li><a href="/en-US/docs/Learn/Forms/Property_compatibility_table_for_form_controls">CSS property compatibility table for form controls</a></li><li><a href="/en-US/docs/Learn/Forms/HTML_forms_in_legacy_browsers">HTML forms in legacy browsers</a></li></ol></details></li><li class="section"><a href="/en-US/docs/Learn/Accessibility">Accessibility — Make the web usable by everyone</a></li><li><details><summary>Accessibility guides</summary><ol><li><a href="/en-US/docs/Learn/Accessibility">Accessibility</a></li><li><a href="/en-US/docs/Learn/Accessibility/What_is_accessibility">What is accessibility?</a></li><li><a href="/en-US/docs/Learn/Accessibility/HTML">HTML: A good basis for accessibility</a></li><li><a href="/en-US/docs/Learn/Accessibility/CSS_and_JavaScript">CSS and JavaScript accessibility best practices</a></li><li><a href="/en-US/docs/Learn/Accessibility/WAI-ARIA_basics">WAI-ARIA basics</a></li><li><a href="/en-US/docs/Learn/Accessibility/Multimedia">Accessible multimedia</a></li><li><a href="/en-US/docs/Learn/Accessibility/Mobile">Mobile accessibility</a></li><li><a href="/en-US/docs/Learn/Accessibility/Accessibility_troubleshooting">Assessment: Accessibility troubleshooting</a></li></ol></details></li><li class="section"><a href="/en-US/docs/Learn/Performance">Performance — Making websites fast and responsive</a></li><li><details><summary>Performance guides</summary><ol><li><a href="/en-US/docs/Learn/Performance">Web performance</a></li><li><a href="/en-US/docs/Learn/Performance/why_web_performance">The "why" of web performance</a></li><li><a href="/en-US/docs/Learn/Performance/What_is_web_performance">What is web performance?</a></li><li><a href="/en-US/docs/Learn/Performance/Perceived_performance">Perceived performance</a></li><li><a href="/en-US/docs/Learn/Performance/Measuring_performance">Measuring performance</a></li><li><a href="/en-US/docs/Learn/Performance/Multimedia">Multimedia: Images</a></li><li><a href="/en-US/docs/Learn/Performance/video">Multimedia: video</a></li><li><a href="/en-US/docs/Learn/Performance/JavaScript">JavaScript performance optimization</a></li><li><a href="/en-US/docs/Learn/Performance/HTML">HTML performance optimization</a></li><li><a href="/en-US/docs/Learn/Performance/CSS">CSS performance optimization</a></li><li><a href="/en-US/docs/Learn/Performance/business_case_for_performance">The business case for web performance</a></li></ol></details></li><li class="section"><a href="/en-US/docs/Learn/MathML">MathML — Writing mathematics with MathML</a></li><li><details><summary>MathML first steps</summary><ol><li><a href="/en-US/docs/Learn/MathML/First_steps">MathML first steps</a></li><li><a href="/en-US/docs/Learn/MathML/First_steps/Getting_started">Getting started with MathML</a></li><li><a href="/en-US/docs/Learn/MathML/First_steps/Text_containers">MathML Text Containers</a></li><li><a href="/en-US/docs/Learn/MathML/First_steps/Fractions_and_roots">MathML fractions and roots</a></li><li><a href="/en-US/docs/Learn/MathML/First_steps/Scripts">MathML scripted elements</a></li><li><a href="/en-US/docs/Learn/MathML/First_steps/Tables">MathML tables</a></li><li><a href="/en-US/docs/Learn/MathML/First_steps/Three_famous_mathematical_formulas">Three famous mathematical formulas</a></li></ol></details></li><li class="section"><a href="/en-US/docs/Learn/../Games">Games — Developing games for the web</a></li><li><details><summary>Guides and tutorials</summary><ol><li><a href="/en-US/docs/Games/Introduction">Introduction to game development for the Web</a></li><li><a href="/en-US/docs/Games/Techniques">Techniques for game development</a></li><li><a href="/en-US/docs/Games/Tutorials">Tutorials</a></li><li><a href="/en-US/docs/Games/Publishing_games">Publishing games</a></li></ol></details></li><li class="section"><a href="/en-US/docs/Learn/Tools_and_testing">Tools and testing</a></li><li><details><summary>Client-side web development tools</summary><ol><li><a href="/en-US/docs/Learn/Tools_and_testing/Understanding_client-side_tools">Understanding client-side web development tools</a></li><li><a href="/en-US/docs/Learn/Tools_and_testing/Understanding_client-side_tools/Overview">Client-side tooling overview</a></li><li><a href="/en-US/docs/Learn/Tools_and_testing/Understanding_client-side_tools/Command_line">Command line crash course</a></li><li><a href="/en-US/docs/Learn/Tools_and_testing/Understanding_client-side_tools/Package_management">Package management basics</a></li><li><a href="/en-US/docs/Learn/Tools_and_testing/Understanding_client-side_tools/Introducing_complete_toolchain">Introducing a complete toolchain</a></li><li><a href="/en-US/docs/Learn/Tools_and_testing/Understanding_client-side_tools/Deployment">Deploying our app</a></li></ol></details></li><li><details><summary>Introduction to client-side frameworks</summary><ol><li><a href="/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/Introduction">Introduction to client-side frameworks</a></li><li><a href="/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/Main_features">Framework main features</a></li></ol></details></li><li><details><summary>React</summary><ol><li><a href="/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/React_getting_started">Getting started with React</a></li><li><a href="/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/React_todo_list_beginning">Beginning our React todo list</a></li><li><a href="/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/React_components">Componentizing our React app</a></li><li><a href="/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/React_interactivity_events_state">React interactivity: Events and state</a></li><li><a href="/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/React_interactivity_filtering_conditional_rendering">React interactivity: Editing, filtering, conditional rendering</a></li><li><a href="/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/React_accessibility">Accessibility in React</a></li><li><a href="/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/React_resources">React resources</a></li></ol></details></li><li><details><summary>Ember</summary><ol><li><a href="/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/Ember_getting_started">Getting started with Ember</a></li><li><a href="/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/Ember_structure_componentization">Ember app structure and componentization</a></li><li><a href="/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/Ember_interactivity_events_state">Ember interactivity: Events, classes and state</a></li><li><a href="/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/Ember_conditional_footer">Ember Interactivity: Footer functionality, conditional rendering</a></li><li><a href="/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/Ember_routing">Routing in Ember</a></li><li><a href="/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/Ember_resources">Ember resources and troubleshooting</a></li></ol></details></li><li><details><summary>Vue</summary><ol><li><a href="/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/Vue_getting_started">Getting started with Vue</a></li><li><a href="/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/Vue_first_component">Creating our first Vue component</a></li><li><a href="/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/Vue_rendering_lists">Rendering a list of Vue components</a></li><li><a href="/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/Vue_methods_events_models">Adding a new todo form: Vue events, methods, and models</a></li><li><a href="/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/Vue_styling">Styling Vue components with CSS</a></li><li><a href="/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/Vue_computed_properties">Using Vue computed properties</a></li><li><a href="/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/Vue_conditional_rendering">Vue conditional rendering: editing existing todos</a></li><li><a href="/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/Vue_refs_focus_management">Vue refs and lifecycle methods for focus management</a></li><li><a href="/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/Vue_resources">Vue resources</a></li></ol></details></li><li><details><summary>Svelte</summary><ol><li><a href="/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/Svelte_getting_started">Getting started with Svelte</a></li><li><a href="/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/Svelte_Todo_list_beginning">Starting our Svelte to-do list app</a></li><li><a href="/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/Svelte_variables_props">Dynamic behavior in Svelte: working with variables and props</a></li><li><a href="/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/Svelte_components">Componentizing our Svelte app</a></li><li><a href="/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/Svelte_reactivity_lifecycle_accessibility">Advanced Svelte: Reactivity, lifecycle, accessibility</a></li><li><a href="/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/Svelte_stores">Working with Svelte stores</a></li><li><a href="/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/Svelte_TypeScript">TypeScript support in Svelte</a></li><li><a href="/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/Svelte_deployment_next">Deployment and next steps</a></li></ol></details></li><li><details><summary>Angular</summary><ol><li><a href="/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/Angular_getting_started">Getting started with Angular</a></li><li><a href="/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/Angular_todo_list_beginning">Beginning our Angular todo list app</a></li><li><a href="/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/Angular_styling">Styling our Angular app</a></li><li><a href="/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/Angular_item_component">Creating an item component</a></li><li><a href="/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/Angular_filtering">Filtering our to-do items</a></li><li><a href="/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/Angular_building">Building Angular applications and further resources</a></li></ol></details></li><li><details><summary>Git and GitHub</summary><ol><li><a href="/en-US/docs/Learn/Tools_and_testing/GitHub">Git and GitHub</a></li></ol></details></li><li><details><summary>Cross browser testing</summary><ol><li><a href="/en-US/docs/Learn/Tools_and_testing/Cross_browser_testing">Cross browser testing</a></li><li><a href="/en-US/docs/Learn/Tools_and_testing/Cross_browser_testing/Introduction">Introduction to cross-browser testing</a></li><li><a href="/en-US/docs/Learn/Tools_and_testing/Cross_browser_testing/Testing_strategies">Strategies for carrying out testing</a></li><li><a href="/en-US/docs/Learn/Tools_and_testing/Cross_browser_testing/HTML_and_CSS">Handling common HTML and CSS problems</a></li><li><a href="/en-US/docs/Learn/Tools_and_testing/Cross_browser_testing/JavaScript">Handling common JavaScript problems</a></li><li><a href="/en-US/docs/Learn/Tools_and_testing/Cross_browser_testing/Accessibility">Handling common accessibility problems</a></li><li><a href="/en-US/docs/Learn/Tools_and_testing/Cross_browser_testing/Feature_detection">Implementing feature detection</a></li><li><a href="/en-US/docs/Learn/Tools_and_testing/Cross_browser_testing/Automated_testing">Introduction to automated testing</a></li><li><a href="/en-US/docs/Learn/Tools_and_testing/Cross_browser_testing/Your_own_automation_environment">Setting up your own test automation environment</a></li></ol></details></li><li class="section"><a href="/en-US/docs/Learn/Server-side">Server-side website programming</a></li><li><details><summary>First steps</summary><ol><li><a href="/en-US/docs/Learn/Server-side/First_steps">Server-side website programming first steps</a></li><li><a href="/en-US/docs/Learn/Server-side/First_steps/Introduction">Introduction to the server side</a></li><li><a href="/en-US/docs/Learn/Server-side/First_steps/Client-Server_overview">Client-Server Overview</a></li><li><a href="/en-US/docs/Learn/Server-side/First_steps/Web_frameworks">Server-side web frameworks</a></li><li><a href="/en-US/docs/Learn/Server-side/First_steps/Website_security">Website security</a></li></ol></details></li><li><details><summary>Django web framework (Python)</summary><ol><li><a href="/en-US/docs/Learn/Server-side/Django">Django Web Framework (Python)</a></li><li><a href="/en-US/docs/Learn/Server-side/Django/Introduction">Django introduction</a></li><li><a href="/en-US/docs/Learn/Server-side/Django/development_environment">Setting up a Django development environment</a></li><li><a href="/en-US/docs/Learn/Server-side/Django/Tutorial_local_library_website">Django Tutorial: The Local Library website</a></li><li><a href="/en-US/docs/Learn/Server-side/Django/skeleton_website">Django Tutorial Part 2: Creating a skeleton website</a></li><li><a href="/en-US/docs/Learn/Server-side/Django/Models">Django Tutorial Part 3: Using models</a></li><li><a href="/en-US/docs/Learn/Server-side/Django/Admin_site">Django Tutorial Part 4: Django admin site</a></li><li><a href="/en-US/docs/Learn/Server-side/Django/Home_page">Django Tutorial Part 5: Creating our home page</a></li><li><a href="/en-US/docs/Learn/Server-side/Django/Generic_views">Django Tutorial Part 6: Generic list and detail views</a></li><li><a href="/en-US/docs/Learn/Server-side/Django/Sessions">Django Tutorial Part 7: Sessions framework</a></li><li><a href="/en-US/docs/Learn/Server-side/Django/Authentication">Django Tutorial Part 8: User authentication and permissions</a></li><li><a href="/en-US/docs/Learn/Server-side/Django/Forms">Django Tutorial Part 9: Working with forms</a></li><li><a href="/en-US/docs/Learn/Server-side/Django/Testing">Django Tutorial Part 10: Testing a Django web application</a></li><li><a href="/en-US/docs/Learn/Server-side/Django/Deployment">Django Tutorial Part 11: Deploying Django to production</a></li><li><a href="/en-US/docs/Learn/Server-side/Django/web_application_security">Django web application security</a></li><li><a href="/en-US/docs/Learn/Server-side/Django/django_assessment_blog">Assessment: DIY Django mini blog</a></li></ol></details></li><li><details open=""><summary>Express Web Framework (Node.js/JavaScript)</summary><ol><li><a href="/en-US/docs/Learn/Server-side/Express_Nodejs">Express web framework (Node.js/JavaScript)</a></li><li><a href="/en-US/docs/Learn/Server-side/Express_Nodejs/Introduction">Express/Node introduction</a></li><li><em><a href="/en-US/docs/Learn/Server-side/Express_Nodejs/development_environment" aria-current="page">Setting up a Node development environment</a></em></li><li><a href="/en-US/docs/Learn/Server-side/Express_Nodejs/Tutorial_local_library_website">Express Tutorial: The Local Library website</a></li><li><a href="/en-US/docs/Learn/Server-side/Express_Nodejs/skeleton_website">Express Tutorial Part 2: Creating a skeleton website</a></li><li><a href="/en-US/docs/Learn/Server-side/Express_Nodejs/mongoose">Express Tutorial Part 3: Using a Database (with Mongoose)</a></li><li><a href="/en-US/docs/Learn/Server-side/Express_Nodejs/routes">Express Tutorial Part 4: Routes and controllers</a></li><li><a href="/en-US/docs/Learn/Server-side/Express_Nodejs/Displaying_data">Express Tutorial Part 5: Displaying library data</a></li><li><a href="/en-US/docs/Learn/Server-side/Express_Nodejs/forms">Express Tutorial Part 6: Working with forms</a></li><li><a href="/en-US/docs/Learn/Server-side/Express_Nodejs/deployment">Express Tutorial Part 7: Deploying to production</a></li></ol></details></li><li class="section"><a href="/en-US/docs/Learn/Common_questions">Further resources</a></li><li><details><summary>Common questions</summary><ol><li><a href="/en-US/docs/Learn/Common_questions">Common questions</a></li><li><a href="/en-US/docs/Learn/HTML/Howto">Use HTML to solve common problems</a></li><li><a href="/en-US/docs/Learn/CSS/Howto">Use CSS to solve common problems</a></li><li><a href="/en-US/docs/Learn/JavaScript/Howto">Solve common problems in your JavaScript code</a></li><li><a href="/en-US/docs/Learn/Common_questions/Web_mechanics">Web mechanics</a></li><li><a href="/en-US/docs/Learn/Common_questions/Tools_and_setup">Tools and setup</a></li><li><a href="/en-US/docs/Learn/Common_questions/Design_and_accessibility">Design and accessibility</a></li></ol></details></li></ol></div></div><section class="place side"></section></nav></aside><div class="toc-container"><aside class="toc"><nav><div class="document-toc-container"><section class="document-toc"><header><h2 class="document-toc-heading">In this article</h2></header><ul class="document-toc-list"><li class="document-toc-item "><a class="document-toc-link" href="#express_development_environment_overview">Express development environment overview</a></li><li class="document-toc-item "><a class="document-toc-link" href="#installing_node">Installing Node</a></li><li class="document-toc-item "><a class="document-toc-link" href="#using_npm">Using npm</a></li><li class="document-toc-item "><a class="document-toc-link" href="#installing_the_express_application_generator">Installing the Express Application Generator</a></li><li class="document-toc-item "><a class="document-toc-link" href="#summary">Summary</a></li><li class="document-toc-item "><a class="document-toc-link" href="#see_also">See also</a></li></ul></section></div></nav></aside><section class="place side"></section></div></div><main id="content" class="main-content "><article class="main-page-content" lang="en-US"><header><h1>Setting up a Node development environment</h1></header><div class="section-content"><ul class="prev-next"> <li><a class="button secondary" href="/en-US/docs/Learn/Server-side/Express_Nodejs/Introduction"><span class="button-wrap"> Previous </span></a></li> <li><a class="button secondary" href="/en-US/docs/Learn/Server-side/Express_Nodejs"><span class="button-wrap"> Overview: Express web framework (Node.js/JavaScript)</span></a></li> <li><a class="button secondary" href="/en-US/docs/Learn/Server-side/Express_Nodejs/Tutorial_local_library_website"><span class="button-wrap"> Next </span></a></li> </ul> <p>Now that you know what <a href="/en-US/docs/Learn/Server-side/Express_Nodejs/Introduction#introducing_express">Express</a> is for, we'll show you how to set up and test a Node/Express development environment on Windows, or Linux (Ubuntu), or macOS. For any of those operating systems, this article provides what you need to start developing Express apps.</p> <figure class="table-container"><table> <tbody> <tr> <th scope="row">Prerequisites:</th> <td>Know how to open a terminal / command line. Know how to install software packages on your development computer's operating system.</td> </tr> <tr> <th scope="row">Objective:</th> <td>To set up a development environment for Express on your computer.</td> </tr> </tbody> </table></figure></div><section aria-labelledby="express_development_environment_overview"><h2 id="express_development_environment_overview"><a href="#express_development_environment_overview">Express development environment overview</a></h2><div class="section-content"><p><em>Node</em> and <em>Express</em> make it very easy to set up your computer in order to start developing web applications. This section provides an overview of what tools are needed, explains some of the simplest methods for installing Node (and Express) on Ubuntu, macOS, and Windows, and shows how you can test your installation.</p></div></section><section aria-labelledby="what_is_the_express_development_environment"><h3 id="what_is_the_express_development_environment"><a href="#what_is_the_express_development_environment">What is the Express development environment?</a></h3><div class="section-content"><p>The <em>Express</em> development environment includes an installation of <em>Nodejs</em>, the <em>npm package manager</em>, and (optionally) the <em>Express Application Generator</em> on your local computer.</p> <p><em>Node</em> and the <em>npm</em> package manager are installed together from prepared binary packages, installers, operating system package managers or from source (as shown in the following sections). <em>Express</em> is then installed by npm as a dependency of your individual <em>Express</em> web applications (along with other libraries like template engines, database drivers, authentication middleware, middleware to serve static files, etc.).</p> <p><em>npm</em> can also be used to (globally) install the <em>Express Application Generator</em>, a handy tool for creating skeleton <em>Express</em> web apps that follow the <a href="/en-US/docs/Glossary/MVC">MVC pattern</a>. The application generator is optional because you don't <em>need</em> to use this tool to create apps that use Express, or construct Express apps that have the same architectural layout or dependencies. We'll be using it though, because it makes getting started a lot easier, and promotes a modular application structure.</p> <div class="notecard note"> <p><strong>Note:</strong> Unlike some other web frameworks, the development environment does not include a separate development web server. In <em>Node</em>/<em>Express</em> a web application creates and runs its own web server!</p> </div> <p>There are other peripheral tools that are part of a typical development environment, including <a href="/en-US/docs/Learn/Common_questions/Tools_and_setup/Available_text_editors">text editors</a> or IDEs for editing code, and source control management tools like <a href="https://git-scm.com/" class="external" target="_blank">Git</a> for safely managing different versions of your code. We are assuming that you've already got these sorts of tools installed (in particular a text editor).</p></div></section><section aria-labelledby="what_operating_systems_are_supported"><h3 id="what_operating_systems_are_supported"><a href="#what_operating_systems_are_supported">What operating systems are supported?</a></h3><div class="section-content"><p><em>Node</em> can be run on Windows, macOS, many flavors of Linux, Docker, etc. There is a full list on the Node.js <a href="https://nodejs.org/en/download/package-manager" class="external" target="_blank">Downloads</a> page. Almost any personal computer should have the necessary performance to run Node during development. <em>Express</em> is run in a <em>Node</em> environment, and hence can run on any platform that runs <em>Node</em>.</p> <p>In this article we provide setup instructions for Windows, macOS, and Ubuntu Linux.</p></div></section><section aria-labelledby="what_version_of_nodeexpress_should_you_use"><h3 id="what_version_of_nodeexpress_should_you_use"><a href="#what_version_of_nodeexpress_should_you_use">What version of Node/Express should you use?</a></h3><div class="section-content"><p>There are many <a href="https://nodejs.org/en/blog/release/" class="external" target="_blank">releases of Node</a> — newer releases contain bug fixes, support for more recent versions of ECMAScript (JavaScript) standards, and improvements to the Node APIs.</p> <p>Generally you should use the most recent <em>LTS (long-term supported)</em> release as this will be more stable than the "current" release while still having relatively recent features (and is still being actively maintained). You should use the <em>Current</em> release if you need a feature that is not present in the LTS version.</p> <p>For <em>Express</em> you should always use the latest version.</p></div></section><section aria-labelledby="what_about_databases_and_other_dependencies"><h3 id="what_about_databases_and_other_dependencies"><a href="#what_about_databases_and_other_dependencies">What about databases and other dependencies?</a></h3><div class="section-content"><p>Other dependencies, such as database drivers, template engines, authentication engines, etc. are part of the application, and are imported into the application environment using the npm package manager. We'll discuss them in later app-specific articles.</p></div></section><section aria-labelledby="installing_node"><h2 id="installing_node"><a href="#installing_node">Installing Node</a></h2><div class="section-content"><p> In order to use <em>Express</em> you will have to install <em>Nodejs</em> and the <a href="https://docs.npmjs.com/" class="external" target="_blank">Node Package Manager (npm)</a> on your operating system. To make this easier we'll first install a node version manager, and then we'll use it to install the latest Long Term Supported (LTS) versions of node and npm. </p> <div class="notecard note"> <p> <strong>Note:</strong> You can also install nodejs and npm with installers provide on <a href="https://nodejs.org/en/" class="external" target="_blank">https://nodejs.org/en/</a> (select the button to download the LTS build that is "Recommended for most users"), or you can <a href="https://nodejs.org/en/download/package-manager" class="external" target="_blank">install using the package manager for your OS</a> (nodejs.org). We highly recommend using a node version manager as these make it easier to install, upgrade, and switch between any particular version of node and npm. </p> </div></div></section><section aria-labelledby="windows"><h3 id="windows"><a href="#windows">Windows</a></h3><div class="section-content"><p> There are a number of node version managers for Windows. Here we use <a href="https://github.com/coreybutler/nvm-windows" class="external" target="_blank">nvm-windows</a>, which is highly respected among node developers. </p> <p> Install the latest version using your installer of choice from the <a href="https://github.com/coreybutler/nvm-windows/releases" class="external" target="_blank">nvm-windows/releases</a> page. After <code>nvm-windows</code> has installed, open a command prompt (or PowerShell) and enter the following command to download the most recent LTS version of nodejs and npm: </p> <div class="code-example"><div class="example-header"><span class="language-name">bash</span></div><pre class="brush: bash notranslate"><code>nvm install lts </code></pre></div> <p> At time of writing the LTS version of nodejs is 20.11.0. You can set this as the <em>current version</em> to use with the command below: </p> <div class="code-example"><div class="example-header"><span class="language-name">bash</span></div><pre class="brush: bash notranslate"><code>nvm use 20.11.0 </code></pre></div> <div class="notecard note"> <p><strong>Note:</strong> If you get "Access Denied" warnings, you will need to run this command in a prompt with administration permissions.</p> </div> <p>Use the command <code>nvm --help</code> to find out other command line options, such as listing all available node versions, and all downloaded NVM versions.</p></div></section><section aria-labelledby="ubuntu_and_macos"><h3 id="ubuntu_and_macos"><a href="#ubuntu_and_macos">Ubuntu and macOS</a></h3><div class="section-content"><p> There are a number of node version managers for Ubuntu and macOS. <a href="https://github.com/nvm-sh/nvm" class="external" target="_blank">nvm</a> is one of the more popular, and is the original version on which <code>nvm-windows</code> is based. See <a href="https://github.com/nvm-sh/nvm#install--update-script" class="external" target="_blank">nvm > Install & Update Script</a> for the terminal instructions to install the latest version of nvm. </p> <p>After <code>nvm</code> has installed, open a terminal enter the following command to download the most recent LTS version of nodejs and npm:</p> <div class="code-example"><div class="example-header"><span class="language-name">bash</span></div><pre class="brush: bash notranslate"><code>nvm install --lts </code></pre></div> <p> At the time of writing, the LTS version of nodejs is 20.11.0. The command <code>nvm list</code> shows the downloaded set of version and the current version. You can set a particular version as the <em>current version</em> with the command below (the same as for <code>nvm-windows</code>) </p> <div class="code-example"><div class="example-header"><span class="language-name">bash</span></div><pre class="brush: bash notranslate"><code>nvm use 20.11.0 </code></pre></div> <p> Use the command <code>nvm --help</code> to find out other command line options. These are often similar to, or the same as, those offered by <code>nvm-windows</code>. </p></div></section><section aria-labelledby="testing_your_nodejs_and_npm_installation"><h3 id="testing_your_nodejs_and_npm_installation"><a href="#testing_your_nodejs_and_npm_installation">Testing your Nodejs and npm installation</a></h3><div class="section-content"><p> Once you have set <code>nvm</code> to use a particular node version, you can test the installation. A good way to do this is to use the "version" command in your terminal/command prompt and check that the expected version string is returned: </p> <div class="code-example"><div class="example-header"><span class="language-name">bash</span></div><pre class="brush: bash notranslate"><code>> node -v v20.11.0 </code></pre></div> <p>The <em>Nodejs</em> package manager <em>npm</em> should also have been installed, and can be tested in the same way:</p> <div class="code-example"><div class="example-header"><span class="language-name">bash</span></div><pre class="brush: bash notranslate"><code>> npm -v 10.2.4 </code></pre></div> <p>As a slightly more exciting test let's create a very basic "pure node" server that prints out "Hello World" in the browser when you visit the correct URL in your browser:</p> <ol> <li> <p>Copy the following text into a file named <strong>hellonode.js</strong>. This uses pure Node features (nothing from Express):</p> <div class="code-example"><div class="example-header"><span class="language-name">js</span></div><pre class="brush: js notranslate"><code>//Load HTTP module const http = require("http"); const hostname = "127.0.0.1"; const port = 3000; //Create HTTP server and listen on port 3000 for requests const server = http.createServer((req, res) => { //Set the response HTTP header with HTTP status and Content type res.statusCode = 200; res.setHeader("Content-Type", "text/plain"); res.end("Hello World\n"); }); //listen for request on port 3000, and as a callback function have the port listened on logged server.listen(port, hostname, () => { console.log(`Server running at http://${hostname}:${port}/`); }); </code></pre></div> <p>The code imports the "http" module and uses it to create a server (<code>createServer()</code>) that listens for HTTP requests on port 3000. The script then prints a message to the console about what browser URL you can use to test the server. The <code>createServer()</code> function takes as an argument a callback function that will be invoked when an HTTP request is received — this returns a response with an HTTP status code of 200 ("OK") and the plain text "Hello World".</p> <div class="notecard note"> <p><strong>Note:</strong> Don't worry if you don't understand exactly what this code is doing yet! We'll explain our code in greater detail once we start using Express!</p> </div> </li> <li> <p>Start the server by navigating into the same directory as your <code>hellonode.js</code> file in your command prompt, and calling <code>node</code> along with the script name, like so:</p> <div class="code-example"><div class="example-header"><span class="language-name">bash</span></div><pre class="brush: bash notranslate"><code>node hellonode.js </code></pre></div> <p>Once the server starts, you will see console output indicating the IP address the server is running on:</p> <pre class="brush: plain notranslate">Server running at http://127.0.0.1:3000/ </pre> </li> <li> <p>Navigate to the URL <code>http://127.0.0.1:3000</code>. If everything is working, the browser should display the string "Hello World".</p> </li> </ol></div></section><section aria-labelledby="using_npm"><h2 id="using_npm"><a href="#using_npm">Using npm</a></h2><div class="section-content"><p> Next to <em>Node</em> itself, <a href="https://docs.npmjs.com/" class="external" target="_blank">npm</a> is the most important tool for working with <em>Node</em> applications. <code>npm</code> is used to fetch any packages (JavaScript libraries) that an application needs for development, testing, and/or production, and may also be used to run tests and tools used in the development process. </p> <div class="notecard note"> <p><strong>Note:</strong> From Node's perspective, <em>Express</em> is just another package that you need to install using npm and then require in your own code.</p> </div> <p>You can manually use npm to separately fetch each needed package. Typically we instead manage dependencies using a plain-text definition file named <a href="https://docs.npmjs.com/files/package.json/" class="external" target="_blank">package.json</a>. This file lists all the dependencies for a specific JavaScript "package", including the package's name, version, description, initial file to execute, production dependencies, development dependencies, versions of <em>Node</em> it can work with, etc. The <strong>package.json</strong> file should contain everything npm needs to fetch and run your application (if you were writing a reusable library you could use this definition to upload your package to the npm repository and make it available for other users).</p></div></section><section aria-labelledby="adding_dependencies"><h3 id="adding_dependencies"><a href="#adding_dependencies">Adding dependencies</a></h3><div class="section-content"><p>The following steps show how you can use npm to download a package, save it into the project dependencies, and then require it in a Node application.</p> <div class="notecard note"> <p><strong>Note:</strong> Here we show the instructions to fetch and install the <em>Express</em> package. Later on we'll show how this package, and others, are already specified for us using the <em>Express Application Generator</em>. This section is provided because it is useful to understand how npm works and what is being created by the application generator.</p> </div> <ol> <li> <p>First create a directory for your new application and navigate into it:</p> <div class="code-example"><div class="example-header"><span class="language-name">bash</span></div><pre class="brush: bash notranslate"><code>mkdir myapp cd myapp </code></pre></div> </li> <li> <p>Use the npm <code>init</code> command to create a <strong>package.json</strong> file for your application. This command prompts you for a number of things, including the name and version of your application and the name of the initial entry point file (by default this is <strong>index.js</strong>). For now, just accept the defaults:</p> <div class="code-example"><div class="example-header"><span class="language-name">bash</span></div><pre class="brush: bash notranslate"><code>npm init </code></pre></div> <p>If you display the <strong>package.json</strong> file (<code>cat package.json</code>), you will see the defaults that you accepted, ending with the license.</p> <div class="code-example"><div class="example-header"><span class="language-name">json</span></div><pre class="brush: json notranslate"><code>{ "name": "myapp", "version": "1.0.0", "description": "", "main": "index.js", "scripts": { "test": "echo \"Error: no test specified\" && exit 1" }, "author": "", "license": "ISC" } </code></pre></div> </li> <li> <p>Now install Express in the <code>myapp</code> directory and save it in the dependencies list of your <strong>package.json</strong> file:</p> <div class="code-example"><div class="example-header"><span class="language-name">bash</span></div><pre class="brush: bash notranslate"><code> npm install express </code></pre></div> <p>The dependencies section of your <strong>package.json</strong> will now appear at the end of the <strong>package.json</strong> file and will include <em>Express</em>.</p> <div class="code-example"><div class="example-header"><span class="language-name">json</span></div><pre class="brush: json notranslate"><code>{ "name": "myapp", "version": "1.0.0", "description": "", "main": "index.js", "scripts": { "test": "echo \"Error: no test specified\" && exit 1" }, "author": "", "license": "ISC", "dependencies": { "express": "^4.17.1" } } </code></pre></div> </li> <li> <p> To use the Express library you call the <code>require()</code> function in your <strong>index.js</strong> file to include it in your application. Create this file now, in the root of the "myapp" application directory, and give it the following contents: </p> <div class="code-example"><div class="example-header"><span class="language-name">js</span></div><pre class="brush: js notranslate"><code>const express = require("express"); const app = express(); const port = 3000; app.get("/", (req, res) => { res.send("Hello World!"); }); app.listen(port, () => { console.log(`Example app listening on port ${port}!`); }); </code></pre></div> <p> This code shows a minimal "HelloWorld" Express web application. This imports the "express" module using <code>require()</code> and uses it to create a server (<code>app</code>) that listens for HTTP requests on port 3000 and prints a message to the console explaining what browser URL you can use to test the server. The <code>app.get()</code> function only responds to HTTP <code>GET</code> requests with the specified URL path ('/'), in this case by calling a function to send our <em>Hello World!</em> message. </p> <div class="notecard note"> <p><strong>Note:</strong> The backticks in the <code>`Example app listening on port ${port}!`</code> let us interpolate the value of <code>$port</code> into the string.</p> </div> </li> <li> <p>You can start the server by calling node with the script in your command prompt:</p> <div class="code-example"><div class="example-header"><span class="language-name">bash</span></div><pre class="brush: bash notranslate"><code>node index.js </code></pre></div> <p>You will see the following console output:</p> <pre class="brush: plain notranslate">Example app listening on port 3000 </pre> </li> <li> <p> Navigate to the URL <code>http://localhost:3000/</code>. If everything is working, the browser should display the string "Hello World!". </p> </li> </ol></div></section><section aria-labelledby="development_dependencies"><h3 id="development_dependencies"><a href="#development_dependencies">Development dependencies</a></h3><div class="section-content"><p>If a dependency is only used during development, you should instead save it as a "development dependency" (so that your package users don't have to install it in production). For example, to use the popular JavaScript Linting tool <a href="https://eslint.org/" class="external" target="_blank">ESLint</a> you would call npm as shown:</p> <div class="code-example"><div class="example-header"><span class="language-name">bash</span></div><pre class="brush: bash notranslate"><code>npm install eslint --save-dev </code></pre></div> <p>The following entry would then be added to your application's <strong>package.json</strong>:</p> <div class="code-example"><div class="example-header"><span class="language-name">json</span></div><pre class="brush: json notranslate"><code> "devDependencies": { "eslint": "^7.10.0" } </code></pre></div> <div class="notecard note"> <p><strong>Note:</strong> "<a href="https://en.wikipedia.org/wiki/Lint_(software)" class="external" target="_blank">Linters</a>" are tools that perform static analysis on software in order to recognize and report adherence/non-adherence to some set of coding best practice.</p> </div></div></section><section aria-labelledby="running_tasks"><h3 id="running_tasks"><a href="#running_tasks">Running tasks</a></h3><div class="section-content"><p>In addition to defining and fetching dependencies you can also define <em>named</em> scripts in your <strong>package.json</strong> files and call npm to execute them with the <a href="https://docs.npmjs.com/cli/run-script/" class="external" target="_blank">run-script</a> command. This approach is commonly used to automate running tests and parts of the development or build toolchain (e.g., running tools to minify JavaScript, shrink images, LINT/analyze your code, etc.).</p> <div class="notecard note"> <p><strong>Note:</strong> Task runners like <a href="https://gulpjs.com/" class="external" target="_blank">Gulp</a> and <a href="https://gruntjs.com/" class="external" target="_blank">Grunt</a> can also be used to run tests and other external tools.</p> </div> <p>For example, to define a script to run the <em>eslint</em> development dependency that we specified in the previous section we might add the following script block to our <strong>package.json</strong> file (assuming that our application source is in a folder /src/js):</p> <div class="code-example"><div class="example-header"><span class="language-name">json</span></div><pre class="brush: json notranslate"><code>"scripts": { // … "lint": "eslint src/js" // … } </code></pre></div> <p>To explain a little further, <code>eslint src/js</code> is a command that we could enter in our terminal/command line to run <code>eslint</code> on JavaScript files contained in the <code>src/js</code> directory inside our app directory. Including the above inside our app's package.json file provides a shortcut for this command — <code>lint</code>.</p> <p>We would then be able to run <em>eslint</em> using npm by calling:</p> <div class="code-example"><div class="example-header"><span class="language-name">bash</span></div><pre class="brush: bash notranslate"><code>npm run-script lint # OR (using the alias) npm run lint </code></pre></div> <p>This example may not look any shorter than the original command, but you can include much bigger commands inside your npm scripts, including chains of multiple commands. You could identify a single npm script that runs all your tests at once.</p></div></section><section aria-labelledby="installing_the_express_application_generator"><h2 id="installing_the_express_application_generator"><a href="#installing_the_express_application_generator">Installing the Express Application Generator</a></h2><div class="section-content"><p>The <a href="https://expressjs.com/en/starter/generator.html" class="external" target="_blank">Express Application Generator</a> tool generates an Express application "skeleton". Install the generator using npm as shown:</p> <div class="code-example"><div class="example-header"><span class="language-name">bash</span></div><pre class="brush: bash notranslate"><code>npm install express-generator -g </code></pre></div> <div class="notecard note"> <p><strong>Note:</strong> You may need to prefix this line with <code>sudo</code> on Ubuntu or macOS. The <code>-g</code> flag installs the tool globally so that you can call it from anywhere.</p> </div> <p>To create an <em>Express</em> app named "helloworld" with the default settings, navigate to where you want to create it and run the app as shown:</p> <div class="code-example"><div class="example-header"><span class="language-name">bash</span></div><pre class="brush: bash notranslate"><code>express helloworld </code></pre></div> <div class="notecard note"> <p> <strong>Note:</strong> Unless you're using an old nodejs version (< 8.2.0), you could alternatively skip the installation and run express-generator with <a href="https://github.com/npm/npx#readme" class="external" target="_blank">npx</a>. This has the same effect as installing and then running <code>express-generator</code> but does not install the package on your system: </p> <div class="code-example"><div class="example-header"><span class="language-name">bash</span></div><pre class="brush: bash notranslate"><code>npx express-generator helloworld </code></pre></div> </div> <p> You can also specify the template library to use and a number of other settings. Use the <code>help</code> command to see all the options: </p> <div class="code-example"><div class="example-header"><span class="language-name">bash</span></div><pre class="brush: bash notranslate"><code>express --help </code></pre></div> <p> The generator will create the new Express app in a sub folder of your current location, displaying build progress on the console. On completion, the tool will display the commands you need to enter to install the Node dependencies and start the app. </p> <p> The new app will have a <strong>package.json</strong> file in its root directory. You can open this to see what dependencies are installed, including Express and the template library Jade: </p> <div class="code-example"><div class="example-header"><span class="language-name">json</span></div><pre class="brush: json notranslate"><code>{ "name": "helloworld", "version": "0.0.0", "private": true, "scripts": { "start": "node ./bin/www" }, "dependencies": { "cookie-parser": "~1.4.4", "debug": "~2.6.9", "express": "~4.16.1", "http-errors": "~1.6.3", "jade": "~1.11.0", "morgan": "~1.9.1" } } </code></pre></div> <p>Install all the dependencies for the helloworld app using npm as shown:</p> <div class="code-example"><div class="example-header"><span class="language-name">bash</span></div><pre class="brush: bash notranslate"><code>cd helloworld npm install </code></pre></div> <p>Then run the app (the commands are slightly different for Windows and Linux/macOS), as shown below:</p> <div class="code-example"><div class="example-header"><span class="language-name">bash</span></div><pre class="brush: bash notranslate"><code># Run helloworld on Windows with Command Prompt SET DEBUG=helloworld:* & npm start # Run helloworld on Windows with PowerShell SET DEBUG=helloworld:* | npm start # Run helloworld on Linux/macOS DEBUG=helloworld:* npm start </code></pre></div> <p>The DEBUG command creates useful logging, resulting in an output like the following:</p> <div class="code-example"><div class="example-header"><span class="language-name">bash</span></div><pre class="brush: bash notranslate"><code>>SET DEBUG=helloworld:* & npm start > helloworld@0.0.0 start D:\GitHub\express-tests\helloworld > node ./bin/www helloworld:server Listening on port 3000 +0ms </code></pre></div> <p>Open a browser and navigate to <code>http://localhost:3000/</code> to see the default Express welcome page.</p> <p> <img src="/en-US/docs/Learn/Server-side/Express_Nodejs/development_environment/express_default_screen.png" alt="Express - Generated App Default Screen" width="675" height="301" loading="lazy"> </p> <p>We'll talk more about the generated app when we get to the article on generating a skeleton application.</p></div></section><section aria-labelledby="summary"><h2 id="summary"><a href="#summary">Summary</a></h2><div class="section-content"><p>You now have a Node development environment up and running on your computer that can be used for creating Express web applications. You've also seen how npm can be used to import Express into an application, and also how you can create applications using the Express Application Generator tool and then run them.</p> <p>In the next article we start working through a tutorial to build a complete web application using this environment and associated tools.</p></div></section><section aria-labelledby="see_also"><h2 id="see_also"><a href="#see_also">See also</a></h2><div class="section-content"><ul> <li><a href="https://nodejs.org/en/download/package-manager" class="external" target="_blank">Downloads</a> page (nodejs.org)</li> <li><a href="https://expressjs.com/en/starter/installing.html" class="external" target="_blank">Installing Express</a> (expressjs.com)</li> <li><a href="https://expressjs.com/en/starter/generator.html" class="external" target="_blank">Express Application Generator</a> (expressjs.com)</li> <li><a href="https://learn.microsoft.com/en-us/windows/dev-environment/javascript/" class="external" target="_blank">Using Node.js with Windows subsystem for Linux</a> (docs.microsoft.com)</li> </ul><ul class="prev-next"> <li><a class="button secondary" href="/en-US/docs/Learn/Server-side/Express_Nodejs/Introduction"><span class="button-wrap"> Previous </span></a></li> <li><a class="button secondary" href="/en-US/docs/Learn/Server-side/Express_Nodejs"><span class="button-wrap"> Overview: Express web framework (Node.js/JavaScript)</span></a></li> <li><a class="button secondary" href="/en-US/docs/Learn/Server-side/Express_Nodejs/Tutorial_local_library_website"><span class="button-wrap"> Next </span></a></li> </ul></div></section></article><aside class="article-footer"><div class="article-footer-inner"><div class="svg-container"><svg xmlns="http://www.w3.org/2000/svg" width="162" height="162" viewBox="0 0 162 162" fill="none" role="none"><mask id="b" fill="#fff"><path d="M97.203 47.04c8.113-7.886 18.004-13.871 28.906-17.492a78 78 0 0 1 33.969-3.39c11.443 1.39 22.401 5.295 32.024 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Metadata in HTML</a></li><li><a href=\"/en-US/docs/Learn/HTML/Introduction_to_HTML/HTML_text_fundamentals\">HTML text fundamentals</a></li><li><a href=\"/en-US/docs/Learn/HTML/Introduction_to_HTML/Creating_hyperlinks\">Creating hyperlinks</a></li><li><a href=\"/en-US/docs/Learn/HTML/Introduction_to_HTML/Advanced_text_formatting\">Advanced text formatting</a></li><li><a href=\"/en-US/docs/Learn/HTML/Introduction_to_HTML/Document_and_website_structure\">Document and website structure</a></li><li><a href=\"/en-US/docs/Learn/HTML/Introduction_to_HTML/Debugging_HTML\">Debugging HTML</a></li><li><a href=\"/en-US/docs/Learn/HTML/Introduction_to_HTML/Marking_up_a_letter\">Marking up a letter</a></li><li><a href=\"/en-US/docs/Learn/HTML/Introduction_to_HTML/Structuring_a_page_of_content\">Structuring a page of content</a></li></ol></details></li><li><details><summary>Multimedia and embedding</summary><ol><li><a href=\"/en-US/docs/Learn/HTML/Multimedia_and_embedding\">Multimedia and embedding</a></li><li><a href=\"/en-US/docs/Learn/HTML/Multimedia_and_embedding/Images_in_HTML\">Images in HTML</a></li><li><a href=\"/en-US/docs/Learn/HTML/Multimedia_and_embedding/Video_and_audio_content\">Video and audio content</a></li><li><a href=\"/en-US/docs/Learn/HTML/Multimedia_and_embedding/Other_embedding_technologies\">From object to iframe — other embedding technologies</a></li><li><a href=\"/en-US/docs/Learn/HTML/Multimedia_and_embedding/Adding_vector_graphics_to_the_Web\">Adding vector graphics to the web</a></li><li><a href=\"/en-US/docs/Learn/HTML/Multimedia_and_embedding/Responsive_images\">Responsive images</a></li><li><a href=\"/en-US/docs/Learn/HTML/Multimedia_and_embedding/Mozilla_splash_page\">Mozilla splash page</a></li></ol></details></li><li><details><summary>HTML tables</summary><ol><li><a href=\"/en-US/docs/Learn/HTML/Tables\">HTML tables</a></li><li><a href=\"/en-US/docs/Learn/HTML/Tables/Basics\">HTML table basics</a></li><li><a href=\"/en-US/docs/Learn/HTML/Tables/Advanced\">HTML table advanced features and accessibility</a></li><li><a href=\"/en-US/docs/Learn/HTML/Tables/Structuring_planet_data\">Structuring planet data</a></li></ol></details></li><li class=\"section\"><a href=\"/en-US/docs/Learn/CSS\">CSS — Styling the web</a></li><li><details><summary>CSS first steps</summary><ol><li><a href=\"/en-US/docs/Learn/CSS/First_steps\">CSS first steps</a></li><li><a href=\"/en-US/docs/Learn/CSS/First_steps/What_is_CSS\">What is CSS?</a></li><li><a href=\"/en-US/docs/Learn/CSS/First_steps/Getting_started\">Getting started with CSS</a></li><li><a href=\"/en-US/docs/Learn/CSS/First_steps/How_CSS_is_structured\">How CSS is structured</a></li><li><a href=\"/en-US/docs/Learn/CSS/First_steps/How_CSS_works\">How CSS works</a></li><li><a href=\"/en-US/docs/Learn/CSS/First_steps/Styling_a_biography_page\">Styling a biography page</a></li></ol></details></li><li><details><summary>CSS building blocks</summary><ol><li><a href=\"/en-US/docs/Learn/CSS/Building_blocks\">CSS building blocks</a></li><li><a href=\"/en-US/docs/Learn/CSS/Building_blocks/Selectors\">CSS selectors</a></li><li><a href=\"/en-US/docs/Learn/CSS/Building_blocks/Selectors/Type_Class_and_ID_Selectors\">Type, class, and ID selectors</a></li><li><a href=\"/en-US/docs/Learn/CSS/Building_blocks/Selectors/Attribute_selectors\">Attribute selectors</a></li><li><a href=\"/en-US/docs/Learn/CSS/Building_blocks/Selectors/Pseudo-classes_and_pseudo-elements\">Pseudo-classes and pseudo-elements</a></li><li><a href=\"/en-US/docs/Learn/CSS/Building_blocks/Selectors/Combinators\">Combinators</a></li><li><a href=\"/en-US/docs/Learn/CSS/Building_blocks/Cascade_and_inheritance\">Cascade, specificity, and inheritance</a></li><li><a href=\"/en-US/docs/Learn/CSS/Building_blocks/Cascade_layers\">Cascade layers</a></li><li><a href=\"/en-US/docs/Learn/CSS/Building_blocks/The_box_model\">The box model</a></li><li><a href=\"/en-US/docs/Learn/CSS/Building_blocks/Backgrounds_and_borders\">Backgrounds and borders</a></li><li><a href=\"/en-US/docs/Learn/CSS/Building_blocks/Handling_different_text_directions\">Handling different text directions</a></li><li><a href=\"/en-US/docs/Learn/CSS/Building_blocks/Overflowing_content\">Overflowing content</a></li><li><a href=\"/en-US/docs/Learn/CSS/Building_blocks/Values_and_units\">CSS values and units</a></li><li><a href=\"/en-US/docs/Learn/CSS/Building_blocks/Sizing_items_in_CSS\">Sizing items in CSS</a></li><li><a href=\"/en-US/docs/Learn/CSS/Building_blocks/Images_media_form_elements\">Images, media, and form elements</a></li><li><a href=\"/en-US/docs/Learn/CSS/Building_blocks/Styling_tables\">Styling tables</a></li><li><a href=\"/en-US/docs/Learn/CSS/Building_blocks/Advanced_styling_effects\">Advanced styling effects</a></li><li><a href=\"/en-US/docs/Learn/CSS/Building_blocks/Debugging_CSS\">Debugging CSS</a></li><li><a href=\"/en-US/docs/Learn/CSS/Building_blocks/Organizing\">Organizing your CSS</a></li><li><a href=\"/en-US/docs/Learn/CSS/Building_blocks/Fundamental_CSS_comprehension\">Fundamental CSS comprehension</a></li><li><a href=\"/en-US/docs/Learn/CSS/Building_blocks/Creating_fancy_letterheaded_paper\">Creating fancy letterheaded paper</a></li><li><a href=\"/en-US/docs/Learn/CSS/Building_blocks/A_cool_looking_box\">A cool-looking box</a></li></ol></details></li><li><details><summary>Styling text</summary><ol><li><a href=\"/en-US/docs/Learn/CSS/Styling_text\">CSS styling text</a></li><li><a href=\"/en-US/docs/Learn/CSS/Styling_text/Fundamentals\">Fundamental text and font styling</a></li><li><a href=\"/en-US/docs/Learn/CSS/Styling_text/Styling_lists\">Styling lists</a></li><li><a href=\"/en-US/docs/Learn/CSS/Styling_text/Styling_links\">Styling links</a></li><li><a href=\"/en-US/docs/Learn/CSS/Styling_text/Web_fonts\">Web fonts</a></li><li><a href=\"/en-US/docs/Learn/CSS/Styling_text/Typesetting_a_homepage\">Typesetting a community school homepage</a></li></ol></details></li><li><details><summary>CSS layout</summary><ol><li><a href=\"/en-US/docs/Learn/CSS/CSS_layout\">CSS layout</a></li><li><a href=\"/en-US/docs/Learn/CSS/CSS_layout/Introduction\">Introduction to CSS layout</a></li><li><a href=\"/en-US/docs/Learn/CSS/CSS_layout/Normal_Flow\">Normal Flow</a></li><li><a href=\"/en-US/docs/Learn/CSS/CSS_layout/Flexbox\">Flexbox</a></li><li><a href=\"/en-US/docs/Learn/CSS/CSS_layout/Grids\">Grids</a></li><li><a href=\"/en-US/docs/Learn/CSS/CSS_layout/Floats\">Floats</a></li><li><a href=\"/en-US/docs/Learn/CSS/CSS_layout/Positioning\">Positioning</a></li><li><a href=\"/en-US/docs/Learn/CSS/CSS_layout/Multiple-column_Layout\">Multiple-column layout</a></li><li><a href=\"/en-US/docs/Learn/CSS/CSS_layout/Responsive_Design\">Responsive design</a></li><li><a href=\"/en-US/docs/Learn/CSS/CSS_layout/Media_queries\">Beginner's guide to media queries</a></li><li><a href=\"/en-US/docs/Learn/CSS/CSS_layout/Legacy_Layout_Methods\">Legacy layout methods</a></li><li><a href=\"/en-US/docs/Learn/CSS/CSS_layout/Supporting_Older_Browsers\">Supporting older browsers</a></li><li><a href=\"/en-US/docs/Learn/CSS/CSS_layout/Fundamental_Layout_Comprehension\">Fundamental layout comprehension</a></li></ol></details></li><li class=\"section\"><a href=\"/en-US/docs/Learn/JavaScript\">JavaScript — Dynamic client-side scripting</a></li><li><details><summary>JavaScript first steps</summary><ol><li><a href=\"/en-US/docs/Learn/JavaScript/First_steps\">JavaScript first steps</a></li><li><a href=\"/en-US/docs/Learn/JavaScript/First_steps/What_is_JavaScript\">What is JavaScript?</a></li><li><a href=\"/en-US/docs/Learn/JavaScript/First_steps/A_first_splash\">A first splash into JavaScript</a></li><li><a href=\"/en-US/docs/Learn/JavaScript/First_steps/What_went_wrong\">What went wrong? Troubleshooting JavaScript</a></li><li><a href=\"/en-US/docs/Learn/JavaScript/First_steps/Variables\">Storing the information you need — Variables</a></li><li><a href=\"/en-US/docs/Learn/JavaScript/First_steps/Math\">Basic math in JavaScript — numbers and operators</a></li><li><a href=\"/en-US/docs/Learn/JavaScript/First_steps/Strings\">Handling text — strings in JavaScript</a></li><li><a href=\"/en-US/docs/Learn/JavaScript/First_steps/Useful_string_methods\">Useful string methods</a></li><li><a href=\"/en-US/docs/Learn/JavaScript/First_steps/Arrays\">Arrays</a></li><li><a href=\"/en-US/docs/Learn/JavaScript/First_steps/Silly_story_generator\">Silly story generator</a></li></ol></details></li><li><details><summary>JavaScript building blocks</summary><ol><li><a href=\"/en-US/docs/Learn/JavaScript/Building_blocks\">JavaScript building blocks</a></li><li><a href=\"/en-US/docs/Learn/JavaScript/Building_blocks/conditionals\">Making decisions in your code — conditionals</a></li><li><a href=\"/en-US/docs/Learn/JavaScript/Building_blocks/Looping_code\">Looping code</a></li><li><a href=\"/en-US/docs/Learn/JavaScript/Building_blocks/Functions\">Functions — reusable blocks of code</a></li><li><a href=\"/en-US/docs/Learn/JavaScript/Building_blocks/Build_your_own_function\">Build your own function</a></li><li><a href=\"/en-US/docs/Learn/JavaScript/Building_blocks/Return_values\">Function return values</a></li><li><a href=\"/en-US/docs/Learn/JavaScript/Building_blocks/Events\">Introduction to events</a></li><li><a href=\"/en-US/docs/Learn/JavaScript/Building_blocks/Event_bubbling\">Event bubbling</a></li><li><a href=\"/en-US/docs/Learn/JavaScript/Building_blocks/Image_gallery\">Image gallery</a></li></ol></details></li><li><details><summary>Introducing JavaScript objects</summary><ol><li><a href=\"/en-US/docs/Learn/JavaScript/Objects\">Introducing JavaScript objects</a></li><li><a href=\"/en-US/docs/Learn/JavaScript/Objects/Basics\">JavaScript object basics</a></li><li><a href=\"/en-US/docs/Learn/JavaScript/Objects/Object_prototypes\">Object prototypes</a></li><li><a href=\"/en-US/docs/Learn/JavaScript/Objects/Object-oriented_programming\">Object-oriented programming</a></li><li><a href=\"/en-US/docs/Learn/JavaScript/Objects/Classes_in_JavaScript\">Classes in JavaScript</a></li><li><a href=\"/en-US/docs/Learn/JavaScript/Objects/JSON\">Working with JSON</a></li><li><a href=\"/en-US/docs/Learn/JavaScript/Objects/Object_building_practice\">Object building practice</a></li><li><a href=\"/en-US/docs/Learn/JavaScript/Objects/Adding_bouncing_balls_features\">Adding features to our bouncing balls demo</a></li></ol></details></li><li><details><summary>Asynchronous JavaScript</summary><ol><li><a href=\"/en-US/docs/Learn/JavaScript/Asynchronous\">Asynchronous JavaScript</a></li><li><a href=\"/en-US/docs/Learn/JavaScript/Asynchronous/Introducing\">Introducing asynchronous JavaScript</a></li><li><a href=\"/en-US/docs/Learn/JavaScript/Asynchronous/Promises\">How to use promises</a></li><li><a href=\"/en-US/docs/Learn/JavaScript/Asynchronous/Implementing_a_promise-based_API\">How to implement a promise-based API</a></li><li><a href=\"/en-US/docs/Learn/JavaScript/Asynchronous/Introducing_workers\">Introducing workers</a></li><li><a href=\"/en-US/docs/Learn/JavaScript/Asynchronous/Sequencing_animations\">Sequencing animations</a></li></ol></details></li><li><details><summary>Client-side web APIs</summary><ol><li><a href=\"/en-US/docs/Learn/JavaScript/Client-side_web_APIs\">Client-side web APIs</a></li><li><a href=\"/en-US/docs/Learn/JavaScript/Client-side_web_APIs/Introduction\">Introduction to web APIs</a></li><li><a href=\"/en-US/docs/Learn/JavaScript/Client-side_web_APIs/Manipulating_documents\">Manipulating documents</a></li><li><a href=\"/en-US/docs/Learn/JavaScript/Client-side_web_APIs/Fetching_data\">Fetching data from the server</a></li><li><a href=\"/en-US/docs/Learn/JavaScript/Client-side_web_APIs/Third_party_APIs\">Third-party APIs</a></li><li><a href=\"/en-US/docs/Learn/JavaScript/Client-side_web_APIs/Drawing_graphics\">Drawing graphics</a></li><li><a href=\"/en-US/docs/Learn/JavaScript/Client-side_web_APIs/Video_and_audio_APIs\">Video and Audio APIs</a></li><li><a href=\"/en-US/docs/Learn/JavaScript/Client-side_web_APIs/Client-side_storage\">Client-side storage</a></li></ol></details></li><li class=\"section\"><a href=\"/en-US/docs/Learn/Forms\">Web forms — Working with user data</a></li><li><details><summary>Web form building blocks</summary><ol><li><a href=\"/en-US/docs/Learn/Forms\">Web form building blocks</a></li><li><a href=\"/en-US/docs/Learn/Forms/Your_first_form\">Your first form</a></li><li><a href=\"/en-US/docs/Learn/Forms/How_to_structure_a_web_form\">How to structure a web form</a></li><li><a href=\"/en-US/docs/Learn/Forms/Basic_native_form_controls\">Basic native form controls</a></li><li><a href=\"/en-US/docs/Learn/Forms/HTML5_input_types\">The HTML5 input types</a></li><li><a href=\"/en-US/docs/Learn/Forms/Other_form_controls\">Other form controls</a></li><li><a href=\"/en-US/docs/Learn/Forms/Styling_web_forms\">Styling web forms</a></li><li><a href=\"/en-US/docs/Learn/Forms/Advanced_form_styling\">Advanced form styling</a></li><li><a href=\"/en-US/docs/Learn/Forms/UI_pseudo-classes\">UI pseudo-classes</a></li><li><a href=\"/en-US/docs/Learn/Forms/Form_validation\">Client-side form validation</a></li><li><a href=\"/en-US/docs/Learn/Forms/Sending_and_retrieving_form_data\">Sending form data</a></li></ol></details></li><li><details><summary>Advanced web form techniques</summary><ol><li><a href=\"/en-US/docs/Learn/Forms/How_to_build_custom_form_controls\">How to build custom form controls</a></li><li><a href=\"/en-US/docs/Learn/Forms/Sending_forms_through_JavaScript\">Sending forms through JavaScript</a></li><li><a href=\"/en-US/docs/Learn/Forms/Property_compatibility_table_for_form_controls\">CSS property compatibility table for form controls</a></li><li><a href=\"/en-US/docs/Learn/Forms/HTML_forms_in_legacy_browsers\">HTML forms in legacy browsers</a></li></ol></details></li><li class=\"section\"><a href=\"/en-US/docs/Learn/Accessibility\">Accessibility — Make the web usable by everyone</a></li><li><details><summary>Accessibility guides</summary><ol><li><a href=\"/en-US/docs/Learn/Accessibility\">Accessibility</a></li><li><a href=\"/en-US/docs/Learn/Accessibility/What_is_accessibility\">What is accessibility?</a></li><li><a href=\"/en-US/docs/Learn/Accessibility/HTML\">HTML: A good basis for accessibility</a></li><li><a href=\"/en-US/docs/Learn/Accessibility/CSS_and_JavaScript\">CSS and JavaScript accessibility best practices</a></li><li><a href=\"/en-US/docs/Learn/Accessibility/WAI-ARIA_basics\">WAI-ARIA basics</a></li><li><a href=\"/en-US/docs/Learn/Accessibility/Multimedia\">Accessible multimedia</a></li><li><a href=\"/en-US/docs/Learn/Accessibility/Mobile\">Mobile accessibility</a></li><li><a href=\"/en-US/docs/Learn/Accessibility/Accessibility_troubleshooting\">Assessment: Accessibility troubleshooting</a></li></ol></details></li><li class=\"section\"><a href=\"/en-US/docs/Learn/Performance\">Performance — Making websites fast and responsive</a></li><li><details><summary>Performance guides</summary><ol><li><a href=\"/en-US/docs/Learn/Performance\">Web performance</a></li><li><a href=\"/en-US/docs/Learn/Performance/why_web_performance\">The \"why\" of web performance</a></li><li><a href=\"/en-US/docs/Learn/Performance/What_is_web_performance\">What is web performance?</a></li><li><a href=\"/en-US/docs/Learn/Performance/Perceived_performance\">Perceived performance</a></li><li><a href=\"/en-US/docs/Learn/Performance/Measuring_performance\">Measuring performance</a></li><li><a href=\"/en-US/docs/Learn/Performance/Multimedia\">Multimedia: Images</a></li><li><a href=\"/en-US/docs/Learn/Performance/video\">Multimedia: video</a></li><li><a href=\"/en-US/docs/Learn/Performance/JavaScript\">JavaScript performance optimization</a></li><li><a href=\"/en-US/docs/Learn/Performance/HTML\">HTML performance optimization</a></li><li><a href=\"/en-US/docs/Learn/Performance/CSS\">CSS performance optimization</a></li><li><a href=\"/en-US/docs/Learn/Performance/business_case_for_performance\">The business case for web performance</a></li></ol></details></li><li class=\"section\"><a href=\"/en-US/docs/Learn/MathML\">MathML — Writing mathematics with MathML</a></li><li><details><summary>MathML first steps</summary><ol><li><a href=\"/en-US/docs/Learn/MathML/First_steps\">MathML first steps</a></li><li><a href=\"/en-US/docs/Learn/MathML/First_steps/Getting_started\">Getting started with MathML</a></li><li><a href=\"/en-US/docs/Learn/MathML/First_steps/Text_containers\">MathML Text Containers</a></li><li><a href=\"/en-US/docs/Learn/MathML/First_steps/Fractions_and_roots\">MathML fractions and roots</a></li><li><a href=\"/en-US/docs/Learn/MathML/First_steps/Scripts\">MathML scripted elements</a></li><li><a href=\"/en-US/docs/Learn/MathML/First_steps/Tables\">MathML tables</a></li><li><a href=\"/en-US/docs/Learn/MathML/First_steps/Three_famous_mathematical_formulas\">Three famous mathematical formulas</a></li></ol></details></li><li class=\"section\"><a href=\"/en-US/docs/Learn/../Games\">Games — Developing games for the web</a></li><li><details><summary>Guides and tutorials</summary><ol><li><a href=\"/en-US/docs/Games/Introduction\">Introduction to game development for the Web</a></li><li><a href=\"/en-US/docs/Games/Techniques\">Techniques for game development</a></li><li><a href=\"/en-US/docs/Games/Tutorials\">Tutorials</a></li><li><a href=\"/en-US/docs/Games/Publishing_games\">Publishing games</a></li></ol></details></li><li class=\"section\"><a href=\"/en-US/docs/Learn/Tools_and_testing\">Tools and testing</a></li><li><details><summary>Client-side web development tools</summary><ol><li><a href=\"/en-US/docs/Learn/Tools_and_testing/Understanding_client-side_tools\">Understanding client-side web development tools</a></li><li><a href=\"/en-US/docs/Learn/Tools_and_testing/Understanding_client-side_tools/Overview\">Client-side tooling overview</a></li><li><a href=\"/en-US/docs/Learn/Tools_and_testing/Understanding_client-side_tools/Command_line\">Command line crash course</a></li><li><a href=\"/en-US/docs/Learn/Tools_and_testing/Understanding_client-side_tools/Package_management\">Package management basics</a></li><li><a href=\"/en-US/docs/Learn/Tools_and_testing/Understanding_client-side_tools/Introducing_complete_toolchain\">Introducing a complete toolchain</a></li><li><a href=\"/en-US/docs/Learn/Tools_and_testing/Understanding_client-side_tools/Deployment\">Deploying our app</a></li></ol></details></li><li><details><summary>Introduction to client-side frameworks</summary><ol><li><a href=\"/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/Introduction\">Introduction to client-side frameworks</a></li><li><a href=\"/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/Main_features\">Framework main features</a></li></ol></details></li><li><details><summary>React</summary><ol><li><a href=\"/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/React_getting_started\">Getting started with React</a></li><li><a href=\"/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/React_todo_list_beginning\">Beginning our React todo list</a></li><li><a href=\"/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/React_components\">Componentizing our React app</a></li><li><a href=\"/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/React_interactivity_events_state\">React interactivity: Events and state</a></li><li><a href=\"/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/React_interactivity_filtering_conditional_rendering\">React interactivity: Editing, filtering, conditional rendering</a></li><li><a href=\"/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/React_accessibility\">Accessibility in React</a></li><li><a href=\"/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/React_resources\">React resources</a></li></ol></details></li><li><details><summary>Ember</summary><ol><li><a href=\"/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/Ember_getting_started\">Getting started with Ember</a></li><li><a href=\"/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/Ember_structure_componentization\">Ember app structure and componentization</a></li><li><a href=\"/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/Ember_interactivity_events_state\">Ember interactivity: Events, classes and state</a></li><li><a href=\"/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/Ember_conditional_footer\">Ember Interactivity: Footer functionality, conditional rendering</a></li><li><a href=\"/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/Ember_routing\">Routing in Ember</a></li><li><a href=\"/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/Ember_resources\">Ember resources and troubleshooting</a></li></ol></details></li><li><details><summary>Vue</summary><ol><li><a href=\"/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/Vue_getting_started\">Getting started with Vue</a></li><li><a href=\"/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/Vue_first_component\">Creating our first Vue component</a></li><li><a href=\"/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/Vue_rendering_lists\">Rendering a list of Vue components</a></li><li><a href=\"/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/Vue_methods_events_models\">Adding a new todo form: Vue events, methods, and models</a></li><li><a href=\"/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/Vue_styling\">Styling Vue components with CSS</a></li><li><a href=\"/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/Vue_computed_properties\">Using Vue computed properties</a></li><li><a href=\"/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/Vue_conditional_rendering\">Vue conditional rendering: editing existing todos</a></li><li><a href=\"/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/Vue_refs_focus_management\">Vue refs and lifecycle methods for focus management</a></li><li><a href=\"/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/Vue_resources\">Vue resources</a></li></ol></details></li><li><details><summary>Svelte</summary><ol><li><a href=\"/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/Svelte_getting_started\">Getting started with Svelte</a></li><li><a href=\"/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/Svelte_Todo_list_beginning\">Starting our Svelte to-do list app</a></li><li><a href=\"/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/Svelte_variables_props\">Dynamic behavior in Svelte: working with variables and props</a></li><li><a href=\"/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/Svelte_components\">Componentizing our Svelte app</a></li><li><a href=\"/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/Svelte_reactivity_lifecycle_accessibility\">Advanced Svelte: Reactivity, lifecycle, accessibility</a></li><li><a href=\"/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/Svelte_stores\">Working with Svelte stores</a></li><li><a href=\"/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/Svelte_TypeScript\">TypeScript support in Svelte</a></li><li><a href=\"/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/Svelte_deployment_next\">Deployment and next steps</a></li></ol></details></li><li><details><summary>Angular</summary><ol><li><a href=\"/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/Angular_getting_started\">Getting started with Angular</a></li><li><a href=\"/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/Angular_todo_list_beginning\">Beginning our Angular todo list app</a></li><li><a href=\"/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/Angular_styling\">Styling our Angular app</a></li><li><a href=\"/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/Angular_item_component\">Creating an item component</a></li><li><a href=\"/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/Angular_filtering\">Filtering our to-do items</a></li><li><a href=\"/en-US/docs/Learn/Tools_and_testing/Client-side_JavaScript_frameworks/Angular_building\">Building Angular applications and further resources</a></li></ol></details></li><li><details><summary>Git and GitHub</summary><ol><li><a href=\"/en-US/docs/Learn/Tools_and_testing/GitHub\">Git and GitHub</a></li></ol></details></li><li><details><summary>Cross browser testing</summary><ol><li><a href=\"/en-US/docs/Learn/Tools_and_testing/Cross_browser_testing\">Cross browser testing</a></li><li><a href=\"/en-US/docs/Learn/Tools_and_testing/Cross_browser_testing/Introduction\">Introduction to cross-browser testing</a></li><li><a href=\"/en-US/docs/Learn/Tools_and_testing/Cross_browser_testing/Testing_strategies\">Strategies for carrying out testing</a></li><li><a href=\"/en-US/docs/Learn/Tools_and_testing/Cross_browser_testing/HTML_and_CSS\">Handling common HTML and CSS problems</a></li><li><a href=\"/en-US/docs/Learn/Tools_and_testing/Cross_browser_testing/JavaScript\">Handling common JavaScript problems</a></li><li><a href=\"/en-US/docs/Learn/Tools_and_testing/Cross_browser_testing/Accessibility\">Handling common accessibility problems</a></li><li><a href=\"/en-US/docs/Learn/Tools_and_testing/Cross_browser_testing/Feature_detection\">Implementing feature detection</a></li><li><a href=\"/en-US/docs/Learn/Tools_and_testing/Cross_browser_testing/Automated_testing\">Introduction to automated testing</a></li><li><a href=\"/en-US/docs/Learn/Tools_and_testing/Cross_browser_testing/Your_own_automation_environment\">Setting up your own test automation environment</a></li></ol></details></li><li class=\"section\"><a href=\"/en-US/docs/Learn/Server-side\">Server-side website programming</a></li><li><details><summary>First steps</summary><ol><li><a href=\"/en-US/docs/Learn/Server-side/First_steps\">Server-side website programming first steps</a></li><li><a href=\"/en-US/docs/Learn/Server-side/First_steps/Introduction\">Introduction to the server side</a></li><li><a href=\"/en-US/docs/Learn/Server-side/First_steps/Client-Server_overview\">Client-Server Overview</a></li><li><a href=\"/en-US/docs/Learn/Server-side/First_steps/Web_frameworks\">Server-side web frameworks</a></li><li><a href=\"/en-US/docs/Learn/Server-side/First_steps/Website_security\">Website security</a></li></ol></details></li><li><details><summary>Django web framework (Python)</summary><ol><li><a href=\"/en-US/docs/Learn/Server-side/Django\">Django Web Framework (Python)</a></li><li><a href=\"/en-US/docs/Learn/Server-side/Django/Introduction\">Django introduction</a></li><li><a href=\"/en-US/docs/Learn/Server-side/Django/development_environment\">Setting up a Django development environment</a></li><li><a href=\"/en-US/docs/Learn/Server-side/Django/Tutorial_local_library_website\">Django Tutorial: The Local Library website</a></li><li><a href=\"/en-US/docs/Learn/Server-side/Django/skeleton_website\">Django Tutorial Part 2: Creating a skeleton website</a></li><li><a href=\"/en-US/docs/Learn/Server-side/Django/Models\">Django Tutorial Part 3: Using models</a></li><li><a href=\"/en-US/docs/Learn/Server-side/Django/Admin_site\">Django Tutorial Part 4: Django admin site</a></li><li><a href=\"/en-US/docs/Learn/Server-side/Django/Home_page\">Django Tutorial Part 5: Creating our home page</a></li><li><a href=\"/en-US/docs/Learn/Server-side/Django/Generic_views\">Django Tutorial Part 6: Generic list and detail views</a></li><li><a href=\"/en-US/docs/Learn/Server-side/Django/Sessions\">Django Tutorial Part 7: Sessions framework</a></li><li><a href=\"/en-US/docs/Learn/Server-side/Django/Authentication\">Django Tutorial Part 8: User authentication and permissions</a></li><li><a href=\"/en-US/docs/Learn/Server-side/Django/Forms\">Django Tutorial Part 9: Working with forms</a></li><li><a href=\"/en-US/docs/Learn/Server-side/Django/Testing\">Django Tutorial Part 10: Testing a Django web application</a></li><li><a href=\"/en-US/docs/Learn/Server-side/Django/Deployment\">Django Tutorial Part 11: Deploying Django to production</a></li><li><a href=\"/en-US/docs/Learn/Server-side/Django/web_application_security\">Django web application security</a></li><li><a href=\"/en-US/docs/Learn/Server-side/Django/django_assessment_blog\">Assessment: DIY Django mini blog</a></li></ol></details></li><li><details open=\"\"><summary>Express Web Framework (Node.js/JavaScript)</summary><ol><li><a href=\"/en-US/docs/Learn/Server-side/Express_Nodejs\">Express web framework (Node.js/JavaScript)</a></li><li><a href=\"/en-US/docs/Learn/Server-side/Express_Nodejs/Introduction\">Express/Node introduction</a></li><li><em><a href=\"/en-US/docs/Learn/Server-side/Express_Nodejs/development_environment\" aria-current=\"page\">Setting up a Node development environment</a></em></li><li><a href=\"/en-US/docs/Learn/Server-side/Express_Nodejs/Tutorial_local_library_website\">Express Tutorial: The Local Library website</a></li><li><a href=\"/en-US/docs/Learn/Server-side/Express_Nodejs/skeleton_website\">Express Tutorial Part 2: Creating a skeleton website</a></li><li><a href=\"/en-US/docs/Learn/Server-side/Express_Nodejs/mongoose\">Express Tutorial Part 3: Using a Database (with Mongoose)</a></li><li><a href=\"/en-US/docs/Learn/Server-side/Express_Nodejs/routes\">Express Tutorial Part 4: Routes and controllers</a></li><li><a href=\"/en-US/docs/Learn/Server-side/Express_Nodejs/Displaying_data\">Express Tutorial Part 5: Displaying library data</a></li><li><a href=\"/en-US/docs/Learn/Server-side/Express_Nodejs/forms\">Express Tutorial Part 6: Working with forms</a></li><li><a href=\"/en-US/docs/Learn/Server-side/Express_Nodejs/deployment\">Express Tutorial Part 7: Deploying to production</a></li></ol></details></li><li class=\"section\"><a href=\"/en-US/docs/Learn/Common_questions\">Further resources</a></li><li><details><summary>Common questions</summary><ol><li><a href=\"/en-US/docs/Learn/Common_questions\">Common questions</a></li><li><a href=\"/en-US/docs/Learn/HTML/Howto\">Use HTML to solve common problems</a></li><li><a href=\"/en-US/docs/Learn/CSS/Howto\">Use CSS to solve common problems</a></li><li><a href=\"/en-US/docs/Learn/JavaScript/Howto\">Solve common problems in your JavaScript code</a></li><li><a href=\"/en-US/docs/Learn/Common_questions/Web_mechanics\">Web mechanics</a></li><li><a href=\"/en-US/docs/Learn/Common_questions/Tools_and_setup\">Tools and setup</a></li><li><a href=\"/en-US/docs/Learn/Common_questions/Design_and_accessibility\">Design and accessibility</a></li></ol></details></li></ol>","sidebarMacro":"LearnSidebar","body":[{"type":"prose","value":{"id":null,"title":null,"isH3":false,"content":"<ul class=\"prev-next\">\n <li><a class=\"button secondary\" href=\"/en-US/docs/Learn/Server-side/Express_Nodejs/Introduction\"><span class=\"button-wrap\"> Previous </span></a></li>\n <li><a class=\"button secondary\" href=\"/en-US/docs/Learn/Server-side/Express_Nodejs\"><span class=\"button-wrap\"> Overview: Express web framework (Node.js/JavaScript)</span></a></li>\n <li><a class=\"button secondary\" href=\"/en-US/docs/Learn/Server-side/Express_Nodejs/Tutorial_local_library_website\"><span class=\"button-wrap\"> Next </span></a></li>\n</ul>\n<p>Now that you know what <a href=\"/en-US/docs/Learn/Server-side/Express_Nodejs/Introduction#introducing_express\">Express</a> is for, we'll show you how to set up and test a Node/Express development environment on Windows, or Linux (Ubuntu), or macOS. For any of those operating systems, this article provides what you need to start developing Express apps.</p>\n<figure class=\"table-container\"><table>\n <tbody>\n <tr>\n <th scope=\"row\">Prerequisites:</th>\n <td>Know how to open a terminal / command line. Know how to install software packages on your development computer's operating system.</td>\n </tr>\n <tr>\n <th scope=\"row\">Objective:</th>\n <td>To set up a development environment for Express on your computer.</td>\n </tr>\n </tbody>\n</table></figure>"}},{"type":"prose","value":{"id":"express_development_environment_overview","title":"Express development environment overview","isH3":false,"content":"<p><em>Node</em> and <em>Express</em> make it very easy to set up your computer in order to start developing web applications. This section provides an overview of what tools are needed, explains some of the simplest methods for installing Node (and Express) on Ubuntu, macOS, and Windows, and shows how you can test your installation.</p>"}},{"type":"prose","value":{"id":"what_is_the_express_development_environment","title":"What is the Express development environment?","isH3":true,"content":"<p>The <em>Express</em> development environment includes an installation of <em>Nodejs</em>, the <em>npm package manager</em>, and (optionally) the <em>Express Application Generator</em> on your local computer.</p>\n<p><em>Node</em> and the <em>npm</em> package manager are installed together from prepared binary packages, installers, operating system package managers or from source (as shown in the following sections). <em>Express</em> is then installed by npm as a dependency of your individual <em>Express</em> web applications (along with other libraries like template engines, database drivers, authentication middleware, middleware to serve static files, etc.).</p>\n<p><em>npm</em> can also be used to (globally) install the <em>Express Application Generator</em>, a handy tool for creating skeleton <em>Express</em> web apps that follow the <a href=\"/en-US/docs/Glossary/MVC\">MVC pattern</a>. The application generator is optional because you don't <em>need</em> to use this tool to create apps that use Express, or construct Express apps that have the same architectural layout or dependencies. We'll be using it though, because it makes getting started a lot easier, and promotes a modular application structure.</p>\n<div class=\"notecard note\">\n <p><strong>Note:</strong> Unlike some other web frameworks, the development environment does not include a separate development web server. In <em>Node</em>/<em>Express</em> a web application creates and runs its own web server!</p>\n</div>\n<p>There are other peripheral tools that are part of a typical development environment, including <a href=\"/en-US/docs/Learn/Common_questions/Tools_and_setup/Available_text_editors\">text editors</a> or IDEs for editing code, and source control management tools like <a href=\"https://git-scm.com/\" class=\"external\" target=\"_blank\">Git</a> for safely managing different versions of your code. We are assuming that you've already got these sorts of tools installed (in particular a text editor).</p>"}},{"type":"prose","value":{"id":"what_operating_systems_are_supported","title":"What operating systems are supported?","isH3":true,"content":"<p><em>Node</em> can be run on Windows, macOS, many flavors of Linux, Docker, etc. There is a full list on the Node.js <a href=\"https://nodejs.org/en/download/package-manager\" class=\"external\" target=\"_blank\">Downloads</a> page. Almost any personal computer should have the necessary performance to run Node during development. <em>Express</em> is run in a <em>Node</em> environment, and hence can run on any platform that runs <em>Node</em>.</p>\n<p>In this article we provide setup instructions for Windows, macOS, and Ubuntu Linux.</p>"}},{"type":"prose","value":{"id":"what_version_of_nodeexpress_should_you_use","title":"What version of Node/Express should you use?","isH3":true,"content":"<p>There are many <a href=\"https://nodejs.org/en/blog/release/\" class=\"external\" target=\"_blank\">releases of Node</a> — newer releases contain bug fixes, support for more recent versions of ECMAScript (JavaScript) standards, and improvements to the Node APIs.</p>\n<p>Generally you should use the most recent <em>LTS (long-term supported)</em> release as this will be more stable than the \"current\" release while still having relatively recent features (and is still being actively maintained). You should use the <em>Current</em> release if you need a feature that is not present in the LTS version.</p>\n<p>For <em>Express</em> you should always use the latest version.</p>"}},{"type":"prose","value":{"id":"what_about_databases_and_other_dependencies","title":"What about databases and other dependencies?","isH3":true,"content":"<p>Other dependencies, such as database drivers, template engines, authentication engines, etc. are part of the application, and are imported into the application environment using the npm package manager. We'll discuss them in later app-specific articles.</p>"}},{"type":"prose","value":{"id":"installing_node","title":"Installing Node","isH3":false,"content":"<p>\n In order to use <em>Express</em> you will have to install <em>Nodejs</em> and the <a href=\"https://docs.npmjs.com/\" class=\"external\" target=\"_blank\">Node Package Manager (npm)</a> on your operating system.\n To make this easier we'll first install a node version manager, and then we'll use it to install the latest Long Term Supported (LTS) versions of node and npm.\n</p>\n<div class=\"notecard note\">\n <p>\n <strong>Note:</strong> You can also install nodejs and npm with installers provide on <a href=\"https://nodejs.org/en/\" class=\"external\" target=\"_blank\">https://nodejs.org/en/</a> (select the button to download the LTS build that is \"Recommended for most users\"), or you can <a href=\"https://nodejs.org/en/download/package-manager\" class=\"external\" target=\"_blank\">install using the package manager for your OS</a> (nodejs.org).\n We highly recommend using a node version manager as these make it easier to install, upgrade, and switch between any particular version of node and npm.\n </p>\n</div>"}},{"type":"prose","value":{"id":"windows","title":"Windows","isH3":true,"content":"<p>\n There are a number of node version managers for Windows.\n Here we use <a href=\"https://github.com/coreybutler/nvm-windows\" class=\"external\" target=\"_blank\">nvm-windows</a>, which is highly respected among node developers.\n</p>\n<p>\n Install the latest version using your installer of choice from the <a href=\"https://github.com/coreybutler/nvm-windows/releases\" class=\"external\" target=\"_blank\">nvm-windows/releases</a> page.\n After <code>nvm-windows</code> has installed, open a command prompt (or PowerShell) and enter the following command to download the most recent LTS version of nodejs and npm:\n</p>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">bash</span></div><pre class=\"brush: bash notranslate\"><code>nvm install lts\n</code></pre></div>\n<p>\n At time of writing the LTS version of nodejs is 20.11.0.\n You can set this as the <em>current version</em> to use with the command below:\n</p>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">bash</span></div><pre class=\"brush: bash notranslate\"><code>nvm use 20.11.0\n</code></pre></div>\n<div class=\"notecard note\">\n <p><strong>Note:</strong> If you get \"Access Denied\" warnings, you will need to run this command in a prompt with administration permissions.</p>\n</div>\n<p>Use the command <code>nvm --help</code> to find out other command line options, such as listing all available node versions, and all downloaded NVM versions.</p>"}},{"type":"prose","value":{"id":"ubuntu_and_macos","title":"Ubuntu and macOS","isH3":true,"content":"<p>\n There are a number of node version managers for Ubuntu and macOS.\n <a href=\"https://github.com/nvm-sh/nvm\" class=\"external\" target=\"_blank\">nvm</a> is one of the more popular, and is the original version on which <code>nvm-windows</code> is based.\n See <a href=\"https://github.com/nvm-sh/nvm#install--update-script\" class=\"external\" target=\"_blank\">nvm > Install & Update Script</a> for the terminal instructions to install the latest version of nvm.\n</p>\n<p>After <code>nvm</code> has installed, open a terminal enter the following command to download the most recent LTS version of nodejs and npm:</p>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">bash</span></div><pre class=\"brush: bash notranslate\"><code>nvm install --lts\n</code></pre></div>\n<p>\n At the time of writing, the LTS version of nodejs is 20.11.0.\n The command <code>nvm list</code> shows the downloaded set of version and the current version.\n You can set a particular version as the <em>current version</em> with the command below (the same as for <code>nvm-windows</code>)\n</p>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">bash</span></div><pre class=\"brush: bash notranslate\"><code>nvm use 20.11.0\n</code></pre></div>\n<p>\n Use the command <code>nvm --help</code> to find out other command line options.\n These are often similar to, or the same as, those offered by <code>nvm-windows</code>.\n</p>"}},{"type":"prose","value":{"id":"testing_your_nodejs_and_npm_installation","title":"Testing your Nodejs and npm installation","isH3":true,"content":"<p>\n Once you have set <code>nvm</code> to use a particular node version, you can test the installation.\n A good way to do this is to use the \"version\" command in your terminal/command prompt and check that the expected version string is returned:\n</p>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">bash</span></div><pre class=\"brush: bash notranslate\"><code>> node -v\nv20.11.0\n</code></pre></div>\n<p>The <em>Nodejs</em> package manager <em>npm</em> should also have been installed, and can be tested in the same way:</p>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">bash</span></div><pre class=\"brush: bash notranslate\"><code>> npm -v\n10.2.4\n</code></pre></div>\n<p>As a slightly more exciting test let's create a very basic \"pure node\" server that prints out \"Hello World\" in the browser when you visit the correct URL in your browser:</p>\n<ol>\n <li>\n <p>Copy the following text into a file named <strong>hellonode.js</strong>. This uses pure Node features (nothing from Express):</p>\n <div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">js</span></div><pre class=\"brush: js notranslate\"><code>//Load HTTP module\nconst http = require(\"http\");\nconst hostname = \"127.0.0.1\";\nconst port = 3000;\n\n//Create HTTP server and listen on port 3000 for requests\nconst server = http.createServer((req, res) => {\n //Set the response HTTP header with HTTP status and Content type\n res.statusCode = 200;\n res.setHeader(\"Content-Type\", \"text/plain\");\n res.end(\"Hello World\\n\");\n});\n\n//listen for request on port 3000, and as a callback function have the port listened on logged\nserver.listen(port, hostname, () => {\n console.log(`Server running at http://${hostname}:${port}/`);\n});\n</code></pre></div>\n <p>The code imports the \"http\" module and uses it to create a server (<code>createServer()</code>) that listens for HTTP requests on port 3000. The script then prints a message to the console about what browser URL you can use to test the server. The <code>createServer()</code> function takes as an argument a callback function that will be invoked when an HTTP request is received — this returns a response with an HTTP status code of 200 (\"OK\") and the plain text \"Hello World\".</p>\n <div class=\"notecard note\">\n <p><strong>Note:</strong> Don't worry if you don't understand exactly what this code is doing yet! We'll explain our code in greater detail once we start using Express!</p>\n </div>\n </li>\n <li>\n <p>Start the server by navigating into the same directory as your <code>hellonode.js</code> file in your command prompt, and calling <code>node</code> along with the script name, like so:</p>\n <div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">bash</span></div><pre class=\"brush: bash notranslate\"><code>node hellonode.js\n</code></pre></div>\n <p>Once the server starts, you will see console output indicating the IP address the server is running on:</p>\n <pre class=\"brush: plain notranslate\">Server running at http://127.0.0.1:3000/\n</pre>\n </li>\n <li>\n <p>Navigate to the URL <code>http://127.0.0.1:3000</code>. If everything is working, the browser should display the string \"Hello World\".</p>\n </li>\n</ol>"}},{"type":"prose","value":{"id":"using_npm","title":"Using npm","isH3":false,"content":"<p>\n Next to <em>Node</em> itself, <a href=\"https://docs.npmjs.com/\" class=\"external\" target=\"_blank\">npm</a> is the most important tool for working with <em>Node</em> applications.\n <code>npm</code> is used to fetch any packages (JavaScript libraries) that an application needs for development, testing, and/or production, and may also be used to run tests and tools used in the development process.\n</p>\n<div class=\"notecard note\">\n <p><strong>Note:</strong> From Node's perspective, <em>Express</em> is just another package that you need to install using npm and then require in your own code.</p>\n</div>\n<p>You can manually use npm to separately fetch each needed package. Typically we instead manage dependencies using a plain-text definition file named <a href=\"https://docs.npmjs.com/files/package.json/\" class=\"external\" target=\"_blank\">package.json</a>. This file lists all the dependencies for a specific JavaScript \"package\", including the package's name, version, description, initial file to execute, production dependencies, development dependencies, versions of <em>Node</em> it can work with, etc. The <strong>package.json</strong> file should contain everything npm needs to fetch and run your application (if you were writing a reusable library you could use this definition to upload your package to the npm repository and make it available for other users).</p>"}},{"type":"prose","value":{"id":"adding_dependencies","title":"Adding dependencies","isH3":true,"content":"<p>The following steps show how you can use npm to download a package, save it into the project dependencies, and then require it in a Node application.</p>\n<div class=\"notecard note\">\n <p><strong>Note:</strong> Here we show the instructions to fetch and install the <em>Express</em> package. Later on we'll show how this package, and others, are already specified for us using the <em>Express Application Generator</em>. This section is provided because it is useful to understand how npm works and what is being created by the application generator.</p>\n</div>\n<ol>\n <li>\n <p>First create a directory for your new application and navigate into it:</p>\n <div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">bash</span></div><pre class=\"brush: bash notranslate\"><code>mkdir myapp\ncd myapp\n</code></pre></div>\n </li>\n <li>\n <p>Use the npm <code>init</code> command to create a <strong>package.json</strong> file for your application. This command prompts you for a number of things, including the name and version of your application and the name of the initial entry point file (by default this is <strong>index.js</strong>). For now, just accept the defaults:</p>\n <div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">bash</span></div><pre class=\"brush: bash notranslate\"><code>npm init\n</code></pre></div>\n <p>If you display the <strong>package.json</strong> file (<code>cat package.json</code>), you will see the defaults that you accepted, ending with the license.</p>\n <div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">json</span></div><pre class=\"brush: json notranslate\"><code>{\n \"name\": \"myapp\",\n \"version\": \"1.0.0\",\n \"description\": \"\",\n \"main\": \"index.js\",\n \"scripts\": {\n \"test\": \"echo \\\"Error: no test specified\\\" && exit 1\"\n },\n \"author\": \"\",\n \"license\": \"ISC\"\n}\n</code></pre></div>\n </li>\n <li>\n <p>Now install Express in the <code>myapp</code> directory and save it in the dependencies list of your <strong>package.json</strong> file:</p>\n <div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">bash</span></div><pre class=\"brush: bash notranslate\"><code> npm install express\n</code></pre></div>\n <p>The dependencies section of your <strong>package.json</strong> will now appear at the end of the <strong>package.json</strong> file and will include <em>Express</em>.</p>\n <div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">json</span></div><pre class=\"brush: json notranslate\"><code>{\n \"name\": \"myapp\",\n \"version\": \"1.0.0\",\n \"description\": \"\",\n \"main\": \"index.js\",\n \"scripts\": {\n \"test\": \"echo \\\"Error: no test specified\\\" && exit 1\"\n },\n \"author\": \"\",\n \"license\": \"ISC\",\n \"dependencies\": {\n \"express\": \"^4.17.1\"\n }\n}\n</code></pre></div>\n </li>\n <li>\n <p>\n To use the Express library you call the <code>require()</code> function in your <strong>index.js</strong> file to include it in your application.\n Create this file now, in the root of the \"myapp\" application directory, and give it the following contents:\n </p>\n <div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">js</span></div><pre class=\"brush: js notranslate\"><code>const express = require(\"express\");\nconst app = express();\nconst port = 3000;\n\napp.get(\"/\", (req, res) => {\n res.send(\"Hello World!\");\n});\n\napp.listen(port, () => {\n console.log(`Example app listening on port ${port}!`);\n});\n</code></pre></div>\n <p>\n This code shows a minimal \"HelloWorld\" Express web application.\n This imports the \"express\" module using <code>require()</code> and uses it to create a server (<code>app</code>) that listens for HTTP requests on port 3000 and prints a message to the console explaining what browser URL you can use to test the server.\n The <code>app.get()</code> function only responds to HTTP <code>GET</code> requests with the specified URL path ('/'), in this case by calling a function to send our <em>Hello World!</em> message.\n </p>\n <div class=\"notecard note\">\n <p><strong>Note:</strong> The backticks in the <code>`Example app listening on port ${port}!`</code> let us interpolate the value of <code>$port</code> into the string.</p>\n </div>\n </li>\n <li>\n <p>You can start the server by calling node with the script in your command prompt:</p>\n <div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">bash</span></div><pre class=\"brush: bash notranslate\"><code>node index.js\n</code></pre></div>\n <p>You will see the following console output:</p>\n <pre class=\"brush: plain notranslate\">Example app listening on port 3000\n</pre>\n </li>\n <li>\n <p>\n Navigate to the URL <code>http://localhost:3000/</code>.\n If everything is working, the browser should display the string \"Hello World!\".\n </p>\n </li>\n</ol>"}},{"type":"prose","value":{"id":"development_dependencies","title":"Development dependencies","isH3":true,"content":"<p>If a dependency is only used during development, you should instead save it as a \"development dependency\" (so that your package users don't have to install it in production). For example, to use the popular JavaScript Linting tool <a href=\"https://eslint.org/\" class=\"external\" target=\"_blank\">ESLint</a> you would call npm as shown:</p>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">bash</span></div><pre class=\"brush: bash notranslate\"><code>npm install eslint --save-dev\n</code></pre></div>\n<p>The following entry would then be added to your application's <strong>package.json</strong>:</p>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">json</span></div><pre class=\"brush: json notranslate\"><code> \"devDependencies\": {\n \"eslint\": \"^7.10.0\"\n }\n</code></pre></div>\n<div class=\"notecard note\">\n <p><strong>Note:</strong> \"<a href=\"https://en.wikipedia.org/wiki/Lint_(software)\" class=\"external\" target=\"_blank\">Linters</a>\" are tools that perform static analysis on software in order to recognize and report adherence/non-adherence to some set of coding best practice.</p>\n</div>"}},{"type":"prose","value":{"id":"running_tasks","title":"Running tasks","isH3":true,"content":"<p>In addition to defining and fetching dependencies you can also define <em>named</em> scripts in your <strong>package.json</strong> files and call npm to execute them with the <a href=\"https://docs.npmjs.com/cli/run-script/\" class=\"external\" target=\"_blank\">run-script</a> command. This approach is commonly used to automate running tests and parts of the development or build toolchain (e.g., running tools to minify JavaScript, shrink images, LINT/analyze your code, etc.).</p>\n<div class=\"notecard note\">\n <p><strong>Note:</strong> Task runners like <a href=\"https://gulpjs.com/\" class=\"external\" target=\"_blank\">Gulp</a> and <a href=\"https://gruntjs.com/\" class=\"external\" target=\"_blank\">Grunt</a> can also be used to run tests and other external tools.</p>\n</div>\n<p>For example, to define a script to run the <em>eslint</em> development dependency that we specified in the previous section we might add the following script block to our <strong>package.json</strong> file (assuming that our application source is in a folder /src/js):</p>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">json</span></div><pre class=\"brush: json notranslate\"><code>\"scripts\": {\n // …\n \"lint\": \"eslint src/js\"\n // …\n}\n</code></pre></div>\n<p>To explain a little further, <code>eslint src/js</code> is a command that we could enter in our terminal/command line to run <code>eslint</code> on JavaScript files contained in the <code>src/js</code> directory inside our app directory. Including the above inside our app's package.json file provides a shortcut for this command — <code>lint</code>.</p>\n<p>We would then be able to run <em>eslint</em> using npm by calling:</p>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">bash</span></div><pre class=\"brush: bash notranslate\"><code>npm run-script lint\n# OR (using the alias)\nnpm run lint\n</code></pre></div>\n<p>This example may not look any shorter than the original command, but you can include much bigger commands inside your npm scripts, including chains of multiple commands. You could identify a single npm script that runs all your tests at once.</p>"}},{"type":"prose","value":{"id":"installing_the_express_application_generator","title":"Installing the Express Application Generator","isH3":false,"content":"<p>The <a href=\"https://expressjs.com/en/starter/generator.html\" class=\"external\" target=\"_blank\">Express Application Generator</a> tool generates an Express application \"skeleton\". Install the generator using npm as shown:</p>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">bash</span></div><pre class=\"brush: bash notranslate\"><code>npm install express-generator -g\n</code></pre></div>\n<div class=\"notecard note\">\n <p><strong>Note:</strong> You may need to prefix this line with <code>sudo</code> on Ubuntu or macOS. The <code>-g</code> flag installs the tool globally so that you can call it from anywhere.</p>\n</div>\n<p>To create an <em>Express</em> app named \"helloworld\" with the default settings, navigate to where you want to create it and run the app as shown:</p>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">bash</span></div><pre class=\"brush: bash notranslate\"><code>express helloworld\n</code></pre></div>\n<div class=\"notecard note\">\n <p>\n <strong>Note:</strong> Unless you're using an old nodejs version (< 8.2.0), you could alternatively skip the installation and run express-generator with <a href=\"https://github.com/npm/npx#readme\" class=\"external\" target=\"_blank\">npx</a>.\n This has the same effect as installing and then running <code>express-generator</code> but does not install the package on your system:\n </p>\n <div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">bash</span></div><pre class=\"brush: bash notranslate\"><code>npx express-generator helloworld\n</code></pre></div>\n</div>\n<p>\n You can also specify the template library to use and a number of other settings.\n Use the <code>help</code> command to see all the options:\n</p>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">bash</span></div><pre class=\"brush: bash notranslate\"><code>express --help\n</code></pre></div>\n<p>\n The generator will create the new Express app in a sub folder of your current location, displaying build progress on the console.\n On completion, the tool will display the commands you need to enter to install the Node dependencies and start the app.\n</p>\n<p>\n The new app will have a <strong>package.json</strong> file in its root directory.\n You can open this to see what dependencies are installed, including Express and the template library Jade:\n</p>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">json</span></div><pre class=\"brush: json notranslate\"><code>{\n \"name\": \"helloworld\",\n \"version\": \"0.0.0\",\n \"private\": true,\n \"scripts\": {\n \"start\": \"node ./bin/www\"\n },\n \"dependencies\": {\n \"cookie-parser\": \"~1.4.4\",\n \"debug\": \"~2.6.9\",\n \"express\": \"~4.16.1\",\n \"http-errors\": \"~1.6.3\",\n \"jade\": \"~1.11.0\",\n \"morgan\": \"~1.9.1\"\n }\n}\n</code></pre></div>\n<p>Install all the dependencies for the helloworld app using npm as shown:</p>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">bash</span></div><pre class=\"brush: bash notranslate\"><code>cd helloworld\nnpm install\n</code></pre></div>\n<p>Then run the app (the commands are slightly different for Windows and Linux/macOS), as shown below:</p>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">bash</span></div><pre class=\"brush: bash notranslate\"><code># Run helloworld on Windows with Command Prompt\nSET DEBUG=helloworld:* & npm start\n\n# Run helloworld on Windows with PowerShell\nSET DEBUG=helloworld:* | npm start\n\n# Run helloworld on Linux/macOS\nDEBUG=helloworld:* npm start\n</code></pre></div>\n<p>The DEBUG command creates useful logging, resulting in an output like the following:</p>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">bash</span></div><pre class=\"brush: bash notranslate\"><code>>SET DEBUG=helloworld:* & npm start\n\n> helloworld@0.0.0 start D:\\GitHub\\express-tests\\helloworld\n> node ./bin/www\n\n helloworld:server Listening on port 3000 +0ms\n</code></pre></div>\n<p>Open a browser and navigate to <code>http://localhost:3000/</code> to see the default Express welcome page.</p>\n<p>\n <img src=\"/en-US/docs/Learn/Server-side/Express_Nodejs/development_environment/express_default_screen.png\" alt=\"Express - Generated App Default Screen\" width=\"675\" height=\"301\" loading=\"lazy\">\n</p>\n<p>We'll talk more about the generated app when we get to the article on generating a skeleton application.</p>"}},{"type":"prose","value":{"id":"summary","title":"Summary","isH3":false,"content":"<p>You now have a Node development environment up and running on your computer that can be used for creating Express web applications. You've also seen how npm can be used to import Express into an application, and also how you can create applications using the Express Application Generator tool and then run them.</p>\n<p>In the next article we start working through a tutorial to build a complete web application using this environment and associated tools.</p>"}},{"type":"prose","value":{"id":"see_also","title":"See also","isH3":false,"content":"<ul>\n <li><a href=\"https://nodejs.org/en/download/package-manager\" class=\"external\" target=\"_blank\">Downloads</a> page (nodejs.org)</li>\n <li><a href=\"https://expressjs.com/en/starter/installing.html\" class=\"external\" target=\"_blank\">Installing Express</a> (expressjs.com)</li>\n <li><a href=\"https://expressjs.com/en/starter/generator.html\" class=\"external\" target=\"_blank\">Express Application Generator</a> (expressjs.com)</li>\n <li><a href=\"https://learn.microsoft.com/en-us/windows/dev-environment/javascript/\" class=\"external\" target=\"_blank\">Using Node.js with Windows subsystem for Linux</a> (docs.microsoft.com)</li>\n</ul><ul class=\"prev-next\">\n <li><a class=\"button secondary\" href=\"/en-US/docs/Learn/Server-side/Express_Nodejs/Introduction\"><span class=\"button-wrap\"> Previous </span></a></li>\n <li><a class=\"button secondary\" href=\"/en-US/docs/Learn/Server-side/Express_Nodejs\"><span class=\"button-wrap\"> Overview: Express web framework (Node.js/JavaScript)</span></a></li>\n <li><a class=\"button secondary\" href=\"/en-US/docs/Learn/Server-side/Express_Nodejs/Tutorial_local_library_website\"><span class=\"button-wrap\"> Next </span></a></li>\n</ul>"}}],"toc":[{"text":"Express development environment overview","id":"express_development_environment_overview"},{"text":"Installing Node","id":"installing_node"},{"text":"Using npm","id":"using_npm"},{"text":"Installing the Express Application Generator","id":"installing_the_express_application_generator"},{"text":"Summary","id":"summary"},{"text":"See also","id":"see_also"}],"summary":"You now have a Node development environment up and running on your computer that can be used for creating Express web applications. You've also seen how npm can be used to import Express into an application, and also how you can create applications using the Express Application Generator tool and then run them.","popularity":0.0333,"modified":"2024-10-25T00:08:46.000Z","other_translations":[{"locale":"de","title":"Einrichtung einer Node-Entwicklungsumgebung","native":"Deutsch"},{"locale":"es","title":"Setting up a Node development environment","native":"Español"},{"locale":"ja","title":"Node 開発環境の設定","native":"日本語"},{"locale":"pt-BR","title":"Configurando o Node como ambiente de desenvolvimento","native":"Português (do Brasil)"},{"locale":"ru","title":"Setting up a Node development environment","native":"Русский"},{"locale":"zh-CN","title":"设置 Node 开发环境","native":"中文 (简体)"},{"locale":"zh-TW","title":"Setting up a Node development environment","native":"正體中文 (繁體)"}],"pageType":"learn-module-chapter","source":{"folder":"en-us/learn/server-side/express_nodejs/development_environment","github_url":"https://github.com/mdn/content/blob/main/files/en-us/learn/server-side/express_nodejs/development_environment/index.md","last_commit_url":"https://github.com/mdn/content/commit/baac7f2a43813a7930ff97b11d9c38b413f97c78","filename":"index.md"},"short_title":"Setting up a Node development environment","parents":[{"uri":"/en-US/docs/Learn","title":"Guides"},{"uri":"/en-US/docs/Learn/Server-side","title":"Server-side website programming"},{"uri":"/en-US/docs/Learn/Server-side/Express_Nodejs","title":"Express web framework (Node.js/JavaScript)"},{"uri":"/en-US/docs/Learn/Server-side/Express_Nodejs/development_environment","title":"Setting up a Node development environment"}],"pageTitle":"Setting up a Node development environment - Learn web development | MDN","noIndexing":false}}</script></body></html>