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class="header-bar"> <a href="https://www.oauth.com" id="home-link" title="OAuth 2.0 Simplified"> <img src="/wp-content/themes/oauthdotcom/images/oauth_logo.png" srcset="/wp-content/themes/oauthdotcom/images/oauth_logo.png 1x, /wp-content/themes/oauthdotcom/images/oauth_logo@2x.png 2x" alt="OAuth 2.0 Servers" /> </a> </div>  <div id="mobile-menu" class="sidemenu sidemenu-off"> <div class="social-widget"> </div>  <div id="searchform-wrap"> <form method="get" id="searchform" action="/"> <div class="oauth-search"> <i class="icon-clear-search">X</i> <input type="text" name="s" id="s" value="" /> </div> </form> </div>  <nav id="main-nav-wrap" itemscope="itemscope" itemtype="https://schema.org/SiteNavigationElement"> <ul id="main-nav" class="main-nav clearfix"><li class="page_item page-item-6 page_item_has_children current_page_item"><a href="/">OAuth.com</a> <ul class='children'> <li class="page_item page-item-2"><a href="/oauth2-servers/background/">Background</a></li> <li class="page_item page-item-914"><a href="/oauth2-servers/getting-ready/" data-section="1">Getting Ready</a></li> <li class="page_item page-item-896 page_item_has_children"><a href="/oauth2-servers/accessing-data/" data-section="2">Accessing Data in an OAuth Server</a> <ul class='children'> <li class="page_item page-item-898"><a href="/oauth2-servers/accessing-data/create-an-application/" data-section="2.1">Create an Application</a></li> <li class="page_item page-item-903"><a href="/oauth2-servers/accessing-data/setting-up-the-environment/" data-section="2.2">Setting up the Environment</a></li> <li class="page_item page-item-907"><a href="/oauth2-servers/accessing-data/authorization-request/" data-section="2.3">Authorization Request</a></li> <li class="page_item page-item-910"><a href="/oauth2-servers/accessing-data/obtaining-an-access-token/" data-section="2.4">Obtaining an Access Token</a></li> <li class="page_item page-item-912"><a href="/oauth2-servers/accessing-data/making-api-requests/" data-section="4.5">Making API Requests</a></li> </ul> </li> <li class="page_item page-item-28 page_item_has_children"><a href="/oauth2-servers/signing-in-with-google/" data-section="3">Signing in with Google</a> <ul class='children'> <li class="page_item page-item-883"><a href="/oauth2-servers/signing-in-with-google/create-an-application/" data-section="3.1">Create an Application</a></li> <li class="page_item page-item-886"><a href="/oauth2-servers/signing-in-with-google/setting-up-the-environment/" data-section="3.2">Setting up the Environment</a></li> <li class="page_item page-item-888"><a href="/oauth2-servers/signing-in-with-google/authorization-request/" data-section="3.3">Authorization Request</a></li> <li class="page_item page-item-891"><a href="/oauth2-servers/signing-in-with-google/getting-an-id-token/" data-section="3.4">Getting an ID Token</a></li> <li class="page_item page-item-893"><a href="/oauth2-servers/signing-in-with-google/verifying-the-user-info/" data-section="3.5">Verifying the User Info</a></li> </ul> </li> <li class="page_item page-item-95 page_item_has_children"><a href="/oauth2-servers/server-side-apps/" data-section="4">Server-Side Apps</a> <ul class='children'> <li class="page_item page-item-865"><a href="/oauth2-servers/server-side-apps/authorization-code/" data-section="4.1">Authorization Code Grant</a></li> <li class="page_item page-item-869"><a href="/oauth2-servers/server-side-apps/example-flow/" data-section="4.2">Example Flow</a></li> <li class="page_item page-item-872"><a href="/oauth2-servers/server-side-apps/possible-errors/" data-section="4.3">Possible Errors</a></li> <li class="page_item page-item-874"><a href="/oauth2-servers/server-side-apps/user-experience/" data-section="4.4">User Experience and Security Considerations</a></li> </ul> </li> <li class="page_item page-item-36 page_item_has_children"><a href="/oauth2-servers/single-page-apps/" data-section="5">Single-Page Apps</a> <ul class='children'> <li class="page_item page-item-856"><a href="/oauth2-servers/single-page-apps/authorization/" data-section="5.1">Authorization</a></li> <li class="page_item page-item-850"><a href="/oauth2-servers/single-page-apps/example-flow/" data-section="5.2">Example Flow</a></li> <li class="page_item page-item-847"><a href="/oauth2-servers/single-page-apps/implicit-flow/" data-section="5.3">Implicit Flow for Single-Page Apps</a></li> <li class="page_item page-item-854"><a href="/oauth2-servers/single-page-apps/security-considerations/" data-section="5.4">Security Considerations for Single-Page Apps</a></li> </ul> </li> <li class="page_item page-item-33 page_item_has_children"><a href="/oauth2-servers/mobile-and-native-apps/" data-section="6">Mobile and Native Apps</a> <ul class='children'> <li class="page_item page-item-838"><a href="/oauth2-servers/mobile-and-native-apps/authorization/" data-section="6.1">Authorization</a></li> <li class="page_item page-item-841"><a href="/oauth2-servers/mobile-and-native-apps/security-considerations/" data-section="6.2">Security Considerations</a></li> </ul> </li> <li class="page_item page-item-138 page_item_has_children"><a href="/oauth2-servers/making-authenticated-requests/" data-section="7">Making Authenticated Requests</a> <ul class='children'> <li class="page_item page-item-833"><a href="/oauth2-servers/making-authenticated-requests/refreshing-an-access-token/" data-section="7.1">Refresh Tokens</a></li> </ul> </li> <li class="page_item page-item-140 page_item_has_children"><a href="/oauth2-servers/client-registration/" data-section="8">Client Registration</a> <ul class='children'> <li class="page_item page-item-142"><a href="/oauth2-servers/client-registration/registering-new-application/" data-section="8.1">Registering a New Application</a></li> <li class="page_item page-item-144"><a href="/oauth2-servers/client-registration/client-id-secret/" data-section="8.2">The Client ID and Secret</a></li> <li class="page_item page-item-146"><a href="/oauth2-servers/client-registration/deleting-applications-revoking-secrets/" data-section="8.3">Deleting Applications and Revoking Secrets</a></li> </ul> </li> <li class="page_item page-item-148 page_item_has_children"><a href="/oauth2-servers/authorization/" data-section="9">Authorization</a> <ul class='children'> <li class="page_item page-item-161"><a href="/oauth2-servers/authorization/the-authorization-request/" data-section="9.1">The Authorization Request</a></li> <li class="page_item page-item-164"><a href="/oauth2-servers/authorization/requiring-user-login/" data-section="9.2">Requiring User Login</a></li> <li class="page_item page-item-166"><a href="/oauth2-servers/authorization/the-authorization-interface/" data-section="9.3">The Authorization Interface</a></li> <li class="page_item page-item-168"><a href="/oauth2-servers/authorization/the-authorization-response/" data-section="9.4">The Authorization Response</a></li> <li class="page_item page-item-170"><a href="/oauth2-servers/authorization/security-considerations/" data-section="9.5">Security Considerations</a></li> </ul> </li> <li class="page_item page-item-174 page_item_has_children"><a href="/oauth2-servers/scope/" data-section="10">Scope</a> <ul class='children'> <li class="page_item page-item-177"><a href="/oauth2-servers/scope/defining-scopes/" data-section="10.1">Defining Scopes</a></li> <li class="page_item page-item-179"><a href="/oauth2-servers/scope/user-interface/" data-section="10.2">User Interface</a></li> <li class="page_item page-item-181"><a href="/oauth2-servers/scope/checkboxes/" data-section="10.3">Checkboxes</a></li> </ul> </li> <li class="page_item page-item-184 page_item_has_children"><a href="/oauth2-servers/redirect-uris/" data-section="11">Redirect URLs</a> <ul class='children'> <li class="page_item page-item-186"><a href="/oauth2-servers/redirect-uris/redirect-uri-registration/" data-section="11.1">Redirect URL Registration</a></li> <li class="page_item page-item-188"><a href="/oauth2-servers/redirect-uris/redirect-uris-native-apps/" data-section="11.2">Redirect URLs for Native Apps</a></li> <li class="page_item page-item-190"><a href="/oauth2-servers/redirect-uris/redirect-uri-validation/" data-section="11.3">Redirect URL Validation</a></li> </ul> </li> <li class="page_item page-item-194 page_item_has_children"><a href="/oauth2-servers/access-tokens/" data-section="12">Access Tokens</a> <ul class='children'> <li class="page_item page-item-196"><a href="/oauth2-servers/access-tokens/authorization-code-request/" data-section="12.1">Authorization Code Request</a></li> <li class="page_item page-item-198"><a href="/oauth2-servers/access-tokens/password-grant/" data-section="12.2">Password Grant</a></li> <li class="page_item page-item-200"><a href="/oauth2-servers/access-tokens/client-credentials/" data-section="12.3">Client Credentials</a></li> <li class="page_item page-item-202"><a href="/oauth2-servers/access-tokens/access-token-response/" data-section="12.4">Access Token Response</a></li> <li class="page_item page-item-204"><a href="/oauth2-servers/access-tokens/self-encoded-access-tokens/" data-section="12.5">Self-Encoded Access Tokens</a></li> <li class="page_item page-item-206"><a href="/oauth2-servers/access-tokens/access-token-lifetime/" data-section="12.6">Access Token Lifetime</a></li> <li class="page_item page-item-208"><a href="/oauth2-servers/access-tokens/refreshing-access-tokens/" data-section="12.7">Refreshing Access Tokens</a></li> </ul> </li> <li class="page_item page-item-210 page_item_has_children"><a href="/oauth2-servers/listing-authorizations/" data-section="13">Listing Authorizations</a> <ul class='children'> <li class="page_item page-item-212"><a href="/oauth2-servers/listing-authorizations/revoking-access/" data-section="13.1">Revoking Access</a></li> </ul> </li> <li class="page_item page-item-216"><a href="/oauth2-servers/the-resource-server/" data-section="14">The Resource Server</a></li> <li class="page_item page-item-608 page_item_has_children"><a href="/oauth2-servers/oauth-native-apps/" data-section="15">OAuth for Native Apps</a> <ul class='children'> <li class="page_item page-item-614"><a href="/oauth2-servers/oauth-native-apps/use-system-browser/" data-section="15.1">Use a System Browser</a></li> <li class="page_item page-item-620"><a href="/oauth2-servers/oauth-native-apps/redirect-urls-for-native-apps/" data-section="15.2">Redirect URLs for Native Apps</a></li> <li class="page_item page-item-626"><a href="/oauth2-servers/oauth-native-apps/pkce/" data-section="15.3">PKCE Extension</a></li> <li class="page_item page-item-627"><a href="/oauth2-servers/oauth-native-apps/checklist-server-support-native-apps/" data-section="15.4">Checklist for Server Support for Native Apps</a></li> </ul> </li> <li class="page_item page-item-640 page_item_has_children"><a href="/oauth2-servers/device-flow/" data-section="16">OAuth for Browserless and Input-Constrained Devices</a> <ul class='children'> <li class="page_item page-item-643"><a href="/oauth2-servers/device-flow/user-flow/" data-section="16.1">User Flow</a></li> <li class="page_item page-item-656"><a href="/oauth2-servers/device-flow/authorization-request/" data-section="16.2">Authorization Request</a></li> <li class="page_item page-item-660"><a href="/oauth2-servers/device-flow/token-request/" data-section="16.3">Token Request</a></li> <li class="page_item page-item-662"><a href="/oauth2-servers/device-flow/authorization-server-requirements/" data-section="16.4">Authorization Server Requirements</a></li> <li class="page_item page-item-666"><a href="/oauth2-servers/device-flow/security-considerations/" data-section="16.5">Security Considerations</a></li> </ul> </li> <li class="page_item page-item-668 page_item_has_children"><a href="/oauth2-servers/pkce/" data-section="17">Protecting Apps with PKCE</a> <ul class='children'> <li class="page_item page-item-670"><a href="/oauth2-servers/pkce/authorization-request/" data-section="17.1">Authorization Request</a></li> <li class="page_item page-item-673"><a href="/oauth2-servers/pkce/authorization-code-exchange/" data-section="17.2">Authorization Code Exchange</a></li> </ul> </li> <li class="page_item page-item-214"><a href="/oauth2-servers/token-introspection-endpoint/" data-section="18">Token Introspection Endpoint</a></li> <li class="page_item page-item-220"><a href="/oauth2-servers/creating-documentation/" data-section="19">Creating Documentation</a></li> <li class="page_item page-item-108"><a href="/oauth2-servers/definitions/" data-section="20">Terminology Reference</a></li> <li class="page_item page-item-136 page_item_has_children"><a href="/oauth2-servers/differences-between-oauth-1-2/" data-section="21">Differences Between OAuth 1 and 2</a> <ul class='children'> <li class="page_item page-item-225"><a href="/oauth2-servers/differences-between-oauth-1-2/authentication-and-signatures/" data-section="21.1">Authentication and Signatures</a></li> <li class="page_item page-item-227"><a href="/oauth2-servers/differences-between-oauth-1-2/user-experience-alternative-token-issuance-options/" data-section="21.2">User Experience and Alternative Token Issuance Options</a></li> <li class="page_item page-item-229"><a href="/oauth2-servers/differences-between-oauth-1-2/performance-at-scale/" data-section="21.3">Performance at Scale</a></li> <li class="page_item page-item-231"><a href="/oauth2-servers/differences-between-oauth-1-2/bearer-tokens/" data-section="21.4">Bearer Tokens</a></li> <li class="page_item page-item-233"><a href="/oauth2-servers/differences-between-oauth-1-2/short-lived-tokens-long-lived-authorizations/" data-section="21.5">Short-lived tokens with Long-lived authorizations</a></li> <li class="page_item page-item-235"><a href="/oauth2-servers/differences-between-oauth-1-2/separation-of-roles/" data-section="21.6">Separation of Roles</a></li> </ul> </li> <li class="page_item page-item-676 page_item_has_children"><a href="/oauth2-servers/openid-connect/" data-section="22">OpenID Connect</a> <ul class='children'> <li class="page_item page-item-678"><a href="/oauth2-servers/openid-connect/authorization-vs-authentication/" data-section="22.1">Authorization vs Authentication</a></li> <li class="page_item page-item-680"><a href="/oauth2-servers/openid-connect/building-an-authentication-framework/" data-section="22.2">Building an Authentication Framework</a></li> <li class="page_item page-item-682"><a href="/oauth2-servers/openid-connect/id-tokens/" data-section="22.3">ID Tokens</a></li> <li class="page_item page-item-684"><a href="/oauth2-servers/openid-connect/summary/" data-section="22.4">Summary</a></li> </ul> </li> <li class="page_item page-item-686 page_item_has_children"><a href="/oauth2-servers/indieauth/" data-section="23">IndieAuth</a> <ul class='children'> <li class="page_item page-item-738"><a href="/oauth2-servers/indieauth/discovery/" data-section="23.1">Discovery</a></li> <li class="page_item page-item-688"><a href="/oauth2-servers/indieauth/sign-in/" data-section="23.2">IndieAuth Sign-In Workflow</a></li> <li class="page_item page-item-690"><a href="/oauth2-servers/indieauth/authorization/" data-section="23.3">IndieAuth Authorization Workflow</a></li> </ul> </li> <li class="page_item page-item-693"><a href="/oauth2-servers/map-oauth-2-0-specs/" data-section="24">Map of OAuth 2.0 Specs</a></li> <li class="page_item page-item-697"><a href="/oauth2-servers/tools-and-libraries/" data-section="25">Tools and Libraries</a></li> <li class="page_item page-item-715"><a href="/oauth2-servers/appendix/">Appendix</a></li> </ul> </li> </ul>  </nav>   <a id="menu-icon-close" href="#"> <?xml version="1.0" encoding="UTF-8"?> <svg width="15px" height="15px" viewBox="0 0 15 15" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">  <title>Close</title> <desc>Created with Sketch.</desc> <defs></defs> <g id="Design" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd"> <g id="OAuth---Table-of-Contents-Menu" transform="translate(-1292.000000, -30.000000)" fill-rule="nonzero" fill="#333333"> <g id="ToC-Menu-Open" transform="translate(993.000000, -16.000000)"> <g id="Close" transform="translate(299.000000, 46.000000)"> <path d="M15.9149259,8.53193792 L-1.05529018,8.53193792 C-1.56341203,8.53193792 -1.97626292,8.12026136 -1.97626292,7.61096518 L-1.97626292,7.24987497 C-1.97626292,6.74175311 -1.56458636,6.32890222 -1.05529018,6.32890222 L15.9161303,6.32890222 C16.4242522,6.32890222 16.8371031,6.74057879 16.8371031,7.24987497 L16.8371031,7.61096518 C16.8359266,8.12026136 16.4242522,8.53193792 15.914956,8.53193792 L15.9149259,8.53193792 Z" id="Shape" transform="translate(7.430420, 7.430420) rotate(-315.000000) translate(-7.430420, -7.430420) "></path> <path d="M15.9149259,8.53193792 L-1.05529018,8.53193792 C-1.56341203,8.53193792 -1.97626292,8.12026136 -1.97626292,7.61096518 L-1.97626292,7.24987497 C-1.97626292,6.74175311 -1.56458636,6.32890222 -1.05529018,6.32890222 L15.9161303,6.32890222 C16.4242522,6.32890222 16.8371031,6.74057879 16.8371031,7.24987497 L16.8371031,7.61096518 C16.8359266,8.12026136 16.4242522,8.53193792 15.914956,8.53193792 L15.9149259,8.53193792 Z" id="Shape-Copy" transform="translate(7.430420, 7.430420) scale(-1, 1) rotate(-315.000000) translate(-7.430420, -7.430420) "></path> </g> </g> </g> </g> </svg> </a> </div>  </header>  </div>  <div id="body" class="clearfix">  <div id="valprop"> <header class="valprop-content"> <h1 style="text-align: center;">OAuth 2.0 Simplified</h1> <p id="byline" style="text-align: center;">Written by Aaron Parecki</p> </header> </div>   <div id="layout" class="pagewidth clearfix">  <div id="content" class="clearfix"> <h2 style="text-align: center;">OAuth 2.0 is the modern standard for securing access to APIs.</h2> <p style="text-align: center;">OAuth 2.0 Simplified is a guide to building an OAuth 2.0 server. Through high-level overviews, step-by-step instructions, and real-world examples, you will learn how to take advantage of the OAuth 2.0 framework while building a secure API.</p> <p style="text-align: center;">Want this book in print or Kindle format? Visit <a href="https://oauth2simplified.com/">oauth2simplified.com</a></p> <div id="themify_builder_content-6" data-postid="6" class="themify_builder_content themify_builder_content-6 themify_builder"> </div>  <p class="cta"> <a class="Button" href="#in-page" target="_self" class="cta"> Learn about OAuth 2.0 </a> <a class="Button" href="https://developer.okta.com/signup/" target="_blank" class="cta"> Solve it with Okta </a> </p> <div id="page-6" class="type-page">  <header class="content-header"> <time datetime="2016-08-09"></time> <h3 class="page-title"> Table of Contents </h3> <div id="searchform-wrap-home"> <form method="get" id="searchform-home" action="/"> <input type="text" name="s" id="s-home" placeholder="Search for a Topic" title="Search" value="" /> </form> </div>  </header>  <div class="page-content entry-content"> <div id="in-page"></div><ul id="main-nav-in-page" class="main-nav clearfix"><div class="menu"><ul> <li class="page_item page-item-6 page_item_has_children current_page_item"><a href="/">OAuth.com</a> <ul class='children'> <li class="page_item page-item-2"><a href="/oauth2-servers/background/">Background</a></li> <li class="page_item page-item-914"><a href="/oauth2-servers/getting-ready/" data-section="1">Getting Ready</a></li> <li class="page_item page-item-896 page_item_has_children"><a href="/oauth2-servers/accessing-data/" data-section="2">Accessing Data in an OAuth Server</a></li> <li class="page_item page-item-28 page_item_has_children"><a href="/oauth2-servers/signing-in-with-google/" data-section="3">Signing in with Google</a></li> <li class="page_item page-item-95 page_item_has_children"><a href="/oauth2-servers/server-side-apps/" data-section="4">Server-Side Apps</a></li> <li class="page_item page-item-36 page_item_has_children"><a href="/oauth2-servers/single-page-apps/" data-section="5">Single-Page Apps</a></li> <li class="page_item page-item-33 page_item_has_children"><a href="/oauth2-servers/mobile-and-native-apps/" data-section="6">Mobile and Native Apps</a></li> <li class="page_item page-item-138 page_item_has_children"><a href="/oauth2-servers/making-authenticated-requests/" data-section="7">Making Authenticated Requests</a></li> <li class="page_item page-item-140 page_item_has_children"><a href="/oauth2-servers/client-registration/" data-section="8">Client Registration</a></li> <li class="page_item page-item-148 page_item_has_children"><a href="/oauth2-servers/authorization/" data-section="9">Authorization</a></li> <li class="page_item page-item-174 page_item_has_children"><a href="/oauth2-servers/scope/" data-section="10">Scope</a></li> <li class="page_item page-item-184 page_item_has_children"><a href="/oauth2-servers/redirect-uris/" data-section="11">Redirect URLs</a></li> <li class="page_item page-item-194 page_item_has_children"><a href="/oauth2-servers/access-tokens/" data-section="12">Access Tokens</a></li> <li class="page_item page-item-210 page_item_has_children"><a href="/oauth2-servers/listing-authorizations/" data-section="13">Listing Authorizations</a></li> <li class="page_item page-item-216"><a href="/oauth2-servers/the-resource-server/" data-section="14">The Resource Server</a></li> <li class="page_item page-item-608 page_item_has_children"><a href="/oauth2-servers/oauth-native-apps/" data-section="15">OAuth for Native Apps</a></li> <li class="page_item page-item-640 page_item_has_children"><a href="/oauth2-servers/device-flow/" data-section="16">OAuth for Browserless and Input-Constrained Devices</a></li> <li class="page_item page-item-668 page_item_has_children"><a href="/oauth2-servers/pkce/" data-section="17">Protecting Apps with PKCE</a></li> <li class="page_item page-item-214"><a href="/oauth2-servers/token-introspection-endpoint/" data-section="18">Token Introspection Endpoint</a></li> <li class="page_item page-item-220"><a href="/oauth2-servers/creating-documentation/" data-section="19">Creating Documentation</a></li> <li class="page_item page-item-108"><a href="/oauth2-servers/definitions/" data-section="20">Terminology Reference</a></li> <li class="page_item page-item-136 page_item_has_children"><a href="/oauth2-servers/differences-between-oauth-1-2/" data-section="21">Differences Between OAuth 1 and 2</a></li> <li class="page_item page-item-676 page_item_has_children"><a href="/oauth2-servers/openid-connect/" data-section="22">OpenID Connect</a></li> <li class="page_item page-item-686 page_item_has_children"><a href="/oauth2-servers/indieauth/" data-section="23">IndieAuth</a></li> <li class="page_item page-item-693"><a href="/oauth2-servers/map-oauth-2-0-specs/" data-section="24">Map of OAuth 2.0 Specs</a></li> <li class="page_item page-item-697"><a href="/oauth2-servers/tools-and-libraries/" data-section="25">Tools and Libraries</a></li> <li class="page_item page-item-715"><a href="/oauth2-servers/appendix/">Appendix</a></li> </ul> </li> </ul></div> </ul>   <h2 class="u-AlignCenter">Learn more in 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