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category-scopes-and-collections tag-async-function tag-document-database tag-express tag-javascript tag-json tag-node-js tag-node-js-sdk tag-nosql tag-rest-api">  <div class="site-header-bg-wrap"> <div class="header-opacity"> <div class="header-gradient"></div> <div class="site-header-bg background-effect" style="background-image: url(https://www.couchbase.com/blog/wp-content/uploads/sites/1/2021/08/how-to-build-rest-api-based-application-nodejs-express-couchbase.png); opacity: 0.5;"></div> </div> </div> <div class="container hero-container">  <div class="hero-text"> <h1 class="entry-title">Build a REST-Based Application with Node.js, Express and Couchbase</h1> <div class="hero-date"> <ul> <li>  <a class="author-profile-avatar" href="https://www.couchbase.com/blog/author/tylermitchell/" title="Posts by Tyler Mitchell - Senior Product Marketing Manager"> <img alt='' src='https://secure.gravatar.com/avatar/f386adafc671ea78fbd52c66f2c8dd76?s=65&d=mm&r=g' srcset='https://secure.gravatar.com/avatar/f386adafc671ea78fbd52c66f2c8dd76?s=130&d=mm&r=g 2x' class='avatar avatar-65 photo' height='65' width='65' decoding='async'/> </a> </li> <li> <div class="auth_detail_wrp">  <a class="auth_name" href="https://www.couchbase.com/blog/author/tylermitchell/"> Tyler Mitchell - Senior Product Marketing Manager </a> </div> <div class="date_blog"> <span class="hero-date-span">September 6, 2021</span> </div> </li> </ul> </div> </div> </div> </div> </div> </div> <div data-rocket-location-hash="71b719af51dc65717bbb466f3afa034d" id="page" class="hfeed site container"> <div data-rocket-location-hash="ab7635cdc6228f2213d248cd4cde9ab1" id="content" class="site-content"> <div data-rocket-location-hash="495936cbeb6374bace73b1518178ba49" id="primary" class="content-area"> <main id="main" class="site-main" role="main"> <article id="post-11742" class="post full-post post-11742 type-post status-publish format-standard has-post-thumbnail hentry category-couchbase-sdk category-javascript category-node-js category-scopes-and-collections tag-async-function tag-document-database tag-express tag-javascript tag-json tag-node-js tag-node-js-sdk tag-nosql tag-rest-api"> <div class="entry-content"> <p><strong>If you’re new to Node.js, Couchbase</strong> or both, you’re about to level up your skills.</p> <p>Today I’ll show you how to build a minimal REST-based application for retrieving documents from Couchbase using Node.js and Express.</p> <p>This post continues my introductory series on <a href="https://www.couchbase.com/blog/get-started-nodejs-sdk-couchbase/?ref=blog" target="_blank" rel="noopener">using Node.js with Couchbase</a> (including <a href="https://www.couchbase.com/blog/how-to-create-nodejs-async-get-upsert-calls-with-couchbase/?ref=blog" target="_blank" rel="noopener">last week’s post on async functions</a>).</p> <p>In today’s post, we’ll build on my previous examples of using Node.js and <a href="https://www.couchbase.com/products/capella/" target="_blank" rel="noopener">Couchbase</a>, so check out those two earlier articles if you haven’t already. I’ll also assume you have basic familiarity with JavaScript, Node.js and NoSQL document databases.</p> <h2>Get the Express Module</h2> <p>Starting from where we left off last week, we can add a web-based REST interface to help isolate your web application from the database. To do this, you need the Express module. Install it and add it to your package dependencies using:</p> <div id="urvanov-syntax-highlighter-6747339a14bca834049343" class="urvanov-syntax-highlighter-syntax crayon-theme-classic urvanov-syntax-highlighter-font-monaco urvanov-syntax-highlighter-os-mac print-yes notranslate" data-settings=" minimize scroll-mouseover" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;"> <div class="crayon-toolbar" data-settings=" mouseover overlay hide delay" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;"><span class="crayon-title"></span> <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;"><div class="crayon-button urvanov-syntax-highlighter-nums-button" title="Toggle Line Numbers"><div class="urvanov-syntax-highlighter-button-icon"></div></div><div class="crayon-button urvanov-syntax-highlighter-plain-button" title="Toggle Plain Code"><div class="urvanov-syntax-highlighter-button-icon"></div></div><div class="crayon-button urvanov-syntax-highlighter-wrap-button" title="Toggle Line Wrap"><div class="urvanov-syntax-highlighter-button-icon"></div></div><div class="crayon-button urvanov-syntax-highlighter-expand-button" title="Expand Code"><div class="urvanov-syntax-highlighter-button-icon"></div></div><div class="crayon-button urvanov-syntax-highlighter-copy-button" title="Copy"><div class="urvanov-syntax-highlighter-button-icon"></div></div><div class="crayon-button urvanov-syntax-highlighter-popup-button" title="Open Code In New Window"><div class="urvanov-syntax-highlighter-button-icon"></div></div></div></div> <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;"></div> <div class="urvanov-syntax-highlighter-plain-wrap"><textarea wrap="soft" class="urvanov-syntax-highlighter-plain print-no" data-settings="dblclick" readonly style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;"> npm install express --save</textarea></div> <div class="urvanov-syntax-highlighter-main" style=""> <table class="crayon-table"> <tr class="urvanov-syntax-highlighter-row"> <td class="crayon-nums " data-settings="show"> <div class="urvanov-syntax-highlighter-nums-content" style="font-size: 12px !important; line-height: 15px !important;"><div class="crayon-num" data-line="urvanov-syntax-highlighter-6747339a14bca834049343-1">1</div></div> </td> <td class="urvanov-syntax-highlighter-code"><div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;"><div class="crayon-line" id="urvanov-syntax-highlighter-6747339a14bca834049343-1"><span class="crayon-e">npm </span><span class="crayon-e">install </span><span class="crayon-v">express</span><span class="crayon-h"> </span><span class="crayon-o">--</span><span class="crayon-v">save</span></div></div></td> </tr> </table> </div> </div>  <p></p> <div class="wp-block-spacer" style="height: 15px" aria-hidden="true"></div> <p>To test that Express is installed correctly, you can build a small application (<code>app.js</code>) that creates the HTTP server and returns a <code>Hello World</code> value. For later convenience, wrap it with an <code>async</code> function as you can see below:</p> <div id="urvanov-syntax-highlighter-6747339a14bd3523000480" class="urvanov-syntax-highlighter-syntax crayon-theme-classic urvanov-syntax-highlighter-font-monaco urvanov-syntax-highlighter-os-mac print-yes notranslate" data-settings=" minimize scroll-mouseover" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;"> <div class="crayon-toolbar" data-settings=" mouseover overlay hide delay" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;"><span class="crayon-title"></span> <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;"><div class="crayon-button urvanov-syntax-highlighter-nums-button" title="Toggle Line Numbers"><div class="urvanov-syntax-highlighter-button-icon"></div></div><div class="crayon-button urvanov-syntax-highlighter-plain-button" title="Toggle Plain Code"><div class="urvanov-syntax-highlighter-button-icon"></div></div><div class="crayon-button urvanov-syntax-highlighter-wrap-button" title="Toggle Line Wrap"><div class="urvanov-syntax-highlighter-button-icon"></div></div><div class="crayon-button urvanov-syntax-highlighter-expand-button" title="Expand Code"><div class="urvanov-syntax-highlighter-button-icon"></div></div><div class="crayon-button urvanov-syntax-highlighter-copy-button" title="Copy"><div class="urvanov-syntax-highlighter-button-icon"></div></div><div class="crayon-button urvanov-syntax-highlighter-popup-button" title="Open Code In New Window"><div class="urvanov-syntax-highlighter-button-icon"></div></div></div></div> <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;"></div> <div class="urvanov-syntax-highlighter-plain-wrap"><textarea wrap="soft" class="urvanov-syntax-highlighter-plain print-no" data-settings="dblclick" readonly style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;"> var app = require('express')(); const couchbase = require("couchbase"); async function main(){ app.get('/', (req, res) =&gt; res.send('Hello world!')); app.listen(3000, () =&gt; console.log('Listening on port 3000')); } main();</textarea></div> <div class="urvanov-syntax-highlighter-main" style=""> <table class="crayon-table"> <tr class="urvanov-syntax-highlighter-row"> <td class="crayon-nums " data-settings="show"> <div class="urvanov-syntax-highlighter-nums-content" style="font-size: 12px !important; line-height: 15px !important;"><div class="crayon-num" data-line="urvanov-syntax-highlighter-6747339a14bd3523000480-1">1</div><div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-6747339a14bd3523000480-2">2</div><div class="crayon-num" data-line="urvanov-syntax-highlighter-6747339a14bd3523000480-3">3</div><div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-6747339a14bd3523000480-4">4</div><div class="crayon-num" data-line="urvanov-syntax-highlighter-6747339a14bd3523000480-5">5</div><div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-6747339a14bd3523000480-6">6</div><div class="crayon-num" data-line="urvanov-syntax-highlighter-6747339a14bd3523000480-7">7</div><div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-6747339a14bd3523000480-8">8</div><div class="crayon-num" data-line="urvanov-syntax-highlighter-6747339a14bd3523000480-9">9</div></div> </td> <td class="urvanov-syntax-highlighter-code"><div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;"><div class="crayon-line" id="urvanov-syntax-highlighter-6747339a14bd3523000480-1"><span class="crayon-t">var</span><span class="crayon-h"> </span><span class="crayon-v">app</span><span class="crayon-h"> </span><span class="crayon-o">=</span><span class="crayon-h"> </span><span class="crayon-e">require</span><span class="crayon-sy">(</span><span class="crayon-s">'express'</span><span class="crayon-sy">)</span><span class="crayon-sy">(</span><span class="crayon-sy">)</span><span class="crayon-sy">;</span></div><div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-6747339a14bd3523000480-2"><span class="crayon-m">const</span><span class="crayon-h"> </span><span class="crayon-v">couchbase</span><span class="crayon-h"> </span><span class="crayon-o">=</span><span class="crayon-h"> </span><span class="crayon-e">require</span><span class="crayon-sy">(</span><span class="crayon-s">"couchbase"</span><span class="crayon-sy">)</span><span class="crayon-sy">;</span></div><div class="crayon-line" id="urvanov-syntax-highlighter-6747339a14bd3523000480-3"> </div><div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-6747339a14bd3523000480-4"><span class="crayon-e">async </span><span class="crayon-t">function</span><span class="crayon-h"> </span><span class="crayon-e">main</span><span class="crayon-sy">(</span><span class="crayon-sy">)</span><span class="crayon-sy">{</span></div><div class="crayon-line" id="urvanov-syntax-highlighter-6747339a14bd3523000480-5"><span class="crayon-h">  </span><span class="crayon-v">app</span><span class="crayon-sy">.</span><span class="crayon-e">get</span><span class="crayon-sy">(</span><span class="crayon-s">'/'</span><span class="crayon-sy">,</span><span class="crayon-h"> </span><span class="crayon-sy">(</span><span class="crayon-v">req</span><span class="crayon-sy">,</span><span class="crayon-h"> </span><span class="crayon-v">res</span><span class="crayon-sy">)</span><span class="crayon-h"> </span><span class="crayon-o">=&</span><span class="crayon-v">gt</span><span class="crayon-sy">;</span><span class="crayon-h"> </span><span class="crayon-v">res</span><span class="crayon-sy">.</span><span class="crayon-e">send</span><span class="crayon-sy">(</span><span class="crayon-s">'Hello world!'</span><span class="crayon-sy">)</span><span class="crayon-sy">)</span><span class="crayon-sy">;</span></div><div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-6747339a14bd3523000480-6"><span class="crayon-h">  </span><span class="crayon-v">app</span><span class="crayon-sy">.</span><span class="crayon-e">listen</span><span class="crayon-sy">(</span><span class="crayon-cn">3000</span><span class="crayon-sy">,</span><span class="crayon-h"> </span><span class="crayon-sy">(</span><span class="crayon-sy">)</span><span class="crayon-h"> </span><span class="crayon-o">=&</span><span class="crayon-v">gt</span><span class="crayon-sy">;</span><span class="crayon-h"> </span><span class="crayon-v">console</span><span class="crayon-sy">.</span><span class="crayon-e">log</span><span class="crayon-sy">(</span><span class="crayon-s">'Listening on port 3000'</span><span class="crayon-sy">)</span><span class="crayon-sy">)</span><span class="crayon-sy">;</span></div><div class="crayon-line" id="urvanov-syntax-highlighter-6747339a14bd3523000480-7"><span class="crayon-sy">}</span></div><div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-6747339a14bd3523000480-8"> </div><div class="crayon-line" id="urvanov-syntax-highlighter-6747339a14bd3523000480-9"><span class="crayon-e">main</span><span class="crayon-sy">(</span><span class="crayon-sy">)</span><span class="crayon-sy">;</span></div></div></td> </tr> </table> </div> </div>  <p></p> <div class="wp-block-spacer" style="height: 15px" aria-hidden="true"></div> <p>Launch it and access it through a web browser on port 3000. It should look something like this image below:</p> <div id="urvanov-syntax-highlighter-6747339a14bd6507291504" class="urvanov-syntax-highlighter-syntax crayon-theme-classic urvanov-syntax-highlighter-font-monaco urvanov-syntax-highlighter-os-mac print-yes notranslate" data-settings=" minimize scroll-mouseover" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;"> <div class="crayon-toolbar" data-settings=" mouseover overlay hide delay" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;"><span class="crayon-title"></span> <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;"><div class="crayon-button urvanov-syntax-highlighter-nums-button" title="Toggle Line Numbers"><div class="urvanov-syntax-highlighter-button-icon"></div></div><div class="crayon-button urvanov-syntax-highlighter-plain-button" title="Toggle Plain Code"><div class="urvanov-syntax-highlighter-button-icon"></div></div><div class="crayon-button urvanov-syntax-highlighter-wrap-button" title="Toggle Line Wrap"><div class="urvanov-syntax-highlighter-button-icon"></div></div><div class="crayon-button urvanov-syntax-highlighter-expand-button" title="Expand Code"><div class="urvanov-syntax-highlighter-button-icon"></div></div><div class="crayon-button urvanov-syntax-highlighter-copy-button" title="Copy"><div class="urvanov-syntax-highlighter-button-icon"></div></div><div class="crayon-button urvanov-syntax-highlighter-popup-button" title="Open Code In New Window"><div class="urvanov-syntax-highlighter-button-icon"></div></div></div></div> <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;"></div> <div class="urvanov-syntax-highlighter-plain-wrap"><textarea wrap="soft" class="urvanov-syntax-highlighter-plain print-no" data-settings="dblclick" readonly style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;"> node app.js</textarea></div> <div class="urvanov-syntax-highlighter-main" style=""> <table class="crayon-table"> <tr class="urvanov-syntax-highlighter-row"> <td class="crayon-nums " data-settings="show"> <div class="urvanov-syntax-highlighter-nums-content" style="font-size: 12px !important; line-height: 15px !important;"><div class="crayon-num" data-line="urvanov-syntax-highlighter-6747339a14bd6507291504-1">1</div></div> </td> <td class="urvanov-syntax-highlighter-code"><div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;"><div class="crayon-line" id="urvanov-syntax-highlighter-6747339a14bd6507291504-1"><span class="crayon-e">node </span><span class="crayon-v">app</span><span class="crayon-sy">.</span><span class="crayon-v">js</span></div></div></td> </tr> </table> </div> </div>  <p></p> <div class="wp-block-spacer" style="height: 15px" aria-hidden="true"></div> <p><a href="https://www.couchbase.com/blog/wp-content/uploads/2021/08/hello-world-node-express-couchbase.png"><img fetchpriority="high" decoding="async" class="aligncenter size-full wp-image-11743" src="https://www.couchbase.com/blog/wp-content/uploads/2021/08/hello-world-node-express-couchbase.png" alt="Hello world showing in a web browser from Node.js and Express" width="734" height="577" srcset="https://www.couchbase.com/blog/wp-content/uploads/sites/1/2021/08/hello-world-node-express-couchbase.png 734w, https://www.couchbase.com/blog/wp-content/uploads/sites/1/2021/08/hello-world-node-express-couchbase-300x236.png 300w, https://www.couchbase.com/blog/wp-content/uploads/sites/1/2021/08/hello-world-node-express-couchbase-20x16.png 20w" sizes="(max-width: 734px) 100vw, 734px" /></a></p> <div class="wp-block-spacer" style="height: 15px" aria-hidden="true"></div> <p>Congratulations! You’ve successfully built your first Express app, albeit a small one.</p> <h2>Building the Application</h2> <p>The application has three components:</p> <ul> <li style="list-style-type: none"> <ul> <li>Route management</li> <li>Database connectivity</li> <li>The HTTP server layer</li> </ul> </li> </ul> <div class="wp-block-spacer" style="height: 15px" aria-hidden="true"></div> <h3>Add an Express Route for Data Retrieval</h3> <p>The application intercepts and serves the root path <code>/</code>. We’ll create a route called <code>get</code> for retrieving a specific document. The REST user provides a document ID and returns <a href="https://www.couchbase.com/blog/json-database/?ref=blog" target="_blank" rel="noopener">the JSON document</a> using the following syntax:</p> <div id="urvanov-syntax-highlighter-6747339a14bd8721998680" class="urvanov-syntax-highlighter-syntax crayon-theme-classic urvanov-syntax-highlighter-font-monaco urvanov-syntax-highlighter-os-mac print-yes notranslate" data-settings=" minimize scroll-mouseover" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;"> <div class="crayon-toolbar" data-settings=" mouseover overlay hide delay" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;"><span class="crayon-title"></span> <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;"><div class="crayon-button urvanov-syntax-highlighter-nums-button" title="Toggle Line Numbers"><div class="urvanov-syntax-highlighter-button-icon"></div></div><div class="crayon-button urvanov-syntax-highlighter-plain-button" title="Toggle Plain Code"><div class="urvanov-syntax-highlighter-button-icon"></div></div><div class="crayon-button urvanov-syntax-highlighter-wrap-button" title="Toggle Line Wrap"><div class="urvanov-syntax-highlighter-button-icon"></div></div><div class="crayon-button urvanov-syntax-highlighter-expand-button" title="Expand Code"><div class="urvanov-syntax-highlighter-button-icon"></div></div><div class="crayon-button urvanov-syntax-highlighter-copy-button" title="Copy"><div class="urvanov-syntax-highlighter-button-icon"></div></div><div class="crayon-button urvanov-syntax-highlighter-popup-button" title="Open Code In New Window"><div class="urvanov-syntax-highlighter-button-icon"></div></div></div></div> <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;"></div> <div class="urvanov-syntax-highlighter-plain-wrap"><textarea wrap="soft" class="urvanov-syntax-highlighter-plain print-no" data-settings="dblclick" readonly style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;"> localhost:3000/get/[documentID]</textarea></div> <div class="urvanov-syntax-highlighter-main" style=""> <table class="crayon-table"> <tr class="urvanov-syntax-highlighter-row"> <td class="crayon-nums " data-settings="show"> <div class="urvanov-syntax-highlighter-nums-content" style="font-size: 12px !important; line-height: 15px !important;"><div class="crayon-num" data-line="urvanov-syntax-highlighter-6747339a14bd8721998680-1">1</div></div> </td> <td class="urvanov-syntax-highlighter-code"><div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;"><div class="crayon-line" id="urvanov-syntax-highlighter-6747339a14bd8721998680-1"><span class="crayon-v">localhost</span><span class="crayon-o">:</span><span class="crayon-cn">3000</span><span class="crayon-o">/</span><span class="crayon-v">get</span><span class="crayon-o">/</span><span class="crayon-sy">[</span><span class="crayon-v">documentID</span><span class="crayon-sy">]</span></div></div></td> </tr> </table> </div> </div>  <p></p> <div class="wp-block-spacer" style="height: 15px" aria-hidden="true"></div> <p>The function for creating that route includes two important objects – <code>req</code> (request) and <code>res</code> (results) – which we’ll use for getting data to and from the app. See the example below:</p> <div id="urvanov-syntax-highlighter-6747339a14bdb995432679" class="urvanov-syntax-highlighter-syntax crayon-theme-classic urvanov-syntax-highlighter-font-monaco urvanov-syntax-highlighter-os-mac print-yes notranslate" data-settings=" minimize scroll-mouseover" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;"> <div class="crayon-toolbar" data-settings=" mouseover overlay hide delay" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;"><span class="crayon-title"></span> <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;"><div class="crayon-button urvanov-syntax-highlighter-nums-button" title="Toggle Line Numbers"><div class="urvanov-syntax-highlighter-button-icon"></div></div><div class="crayon-button urvanov-syntax-highlighter-plain-button" title="Toggle Plain Code"><div class="urvanov-syntax-highlighter-button-icon"></div></div><div class="crayon-button urvanov-syntax-highlighter-wrap-button" title="Toggle Line Wrap"><div class="urvanov-syntax-highlighter-button-icon"></div></div><div class="crayon-button urvanov-syntax-highlighter-expand-button" title="Expand Code"><div class="urvanov-syntax-highlighter-button-icon"></div></div><div class="crayon-button urvanov-syntax-highlighter-copy-button" title="Copy"><div class="urvanov-syntax-highlighter-button-icon"></div></div><div class="crayon-button urvanov-syntax-highlighter-popup-button" title="Open Code In New Window"><div class="urvanov-syntax-highlighter-button-icon"></div></div></div></div> <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;"></div> <div class="urvanov-syntax-highlighter-plain-wrap"><textarea wrap="soft" class="urvanov-syntax-highlighter-plain print-no" data-settings="dblclick" readonly style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;"> app.get('/get/:docid', runAsync(async (req, res) =&gt; { var docid = req.params.docid; var docjson = await getDoc(docid, function(err, result){ res.json(result.content) }); }));</textarea></div> <div class="urvanov-syntax-highlighter-main" style=""> <table class="crayon-table"> <tr class="urvanov-syntax-highlighter-row"> <td class="crayon-nums " data-settings="show"> <div class="urvanov-syntax-highlighter-nums-content" style="font-size: 12px !important; line-height: 15px !important;"><div class="crayon-num" data-line="urvanov-syntax-highlighter-6747339a14bdb995432679-1">1</div><div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-6747339a14bdb995432679-2">2</div><div class="crayon-num" data-line="urvanov-syntax-highlighter-6747339a14bdb995432679-3">3</div><div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-6747339a14bdb995432679-4">4</div><div class="crayon-num" data-line="urvanov-syntax-highlighter-6747339a14bdb995432679-5">5</div><div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-6747339a14bdb995432679-6">6</div><div class="crayon-num" data-line="urvanov-syntax-highlighter-6747339a14bdb995432679-7">7</div></div> </td> <td class="urvanov-syntax-highlighter-code"><div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;"><div class="crayon-line" id="urvanov-syntax-highlighter-6747339a14bdb995432679-1"><span class="crayon-h">  </span><span class="crayon-v">app</span><span class="crayon-sy">.</span><span class="crayon-e">get</span><span class="crayon-sy">(</span><span class="crayon-s">'/get/:docid'</span><span class="crayon-sy">,</span><span class="crayon-h"> </span></div><div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-6747339a14bdb995432679-2"><span class="crayon-h">    </span><span class="crayon-e">runAsync</span><span class="crayon-sy">(</span><span class="crayon-e">async</span><span class="crayon-h"> </span><span class="crayon-sy">(</span><span class="crayon-v">req</span><span class="crayon-sy">,</span><span class="crayon-h"> </span><span class="crayon-v">res</span><span class="crayon-sy">)</span><span class="crayon-h"> </span><span class="crayon-o">=&</span><span class="crayon-v">gt</span><span class="crayon-sy">;</span><span class="crayon-h"> </span><span class="crayon-sy">{</span></div><div class="crayon-line" id="urvanov-syntax-highlighter-6747339a14bdb995432679-3"><span class="crayon-h">      </span><span class="crayon-t">var</span><span class="crayon-h"> </span><span class="crayon-v">docid</span><span class="crayon-h"> </span><span class="crayon-o">=</span><span class="crayon-h"> </span><span class="crayon-v">req</span><span class="crayon-sy">.</span><span class="crayon-v">params</span><span class="crayon-sy">.</span><span class="crayon-v">docid</span><span class="crayon-sy">;</span></div><div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-6747339a14bdb995432679-4"><span class="crayon-h">      </span><span class="crayon-t">var</span><span class="crayon-h"> </span><span class="crayon-v">docjson</span><span class="crayon-h"> </span><span class="crayon-o">=</span><span class="crayon-h"> </span><span class="crayon-e">await </span><span class="crayon-e">getDoc</span><span class="crayon-sy">(</span><span class="crayon-v">docid</span><span class="crayon-sy">,</span><span class="crayon-h"> </span><span class="crayon-t">function</span><span class="crayon-sy">(</span><span class="crayon-v">err</span><span class="crayon-sy">,</span><span class="crayon-h"> </span><span class="crayon-v">result</span><span class="crayon-sy">)</span><span class="crayon-sy">{</span></div><div class="crayon-line" id="urvanov-syntax-highlighter-6747339a14bdb995432679-5"><span class="crayon-h">        </span><span class="crayon-v">res</span><span class="crayon-sy">.</span><span class="crayon-e">json</span><span class="crayon-sy">(</span><span class="crayon-v">result</span><span class="crayon-sy">.</span><span class="crayon-v">content</span><span class="crayon-sy">)</span></div><div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-6747339a14bdb995432679-6"><span class="crayon-h">      </span><span class="crayon-sy">}</span><span class="crayon-sy">)</span><span class="crayon-sy">;</span></div><div class="crayon-line" id="urvanov-syntax-highlighter-6747339a14bdb995432679-7"><span class="crayon-h">  </span><span class="crayon-sy">}</span><span class="crayon-sy">)</span><span class="crayon-sy">)</span><span class="crayon-sy">;</span></div></div></td> </tr> </table> </div> </div>  <p></p> <div class="wp-block-spacer" style="height: 15px" aria-hidden="true"></div> <p>Notice that the <code>:docid</code> parameter becomes a variable you can access through the request object: <code>var docid = req.params.docid</code>. It is then passed to the <code>getDoc()</code> function which we’ll cover in a minute.</p> <p>The application also has this convenience function below for running everything asynchronously:</p> <div id="urvanov-syntax-highlighter-6747339a14bdd707893786" class="urvanov-syntax-highlighter-syntax crayon-theme-classic urvanov-syntax-highlighter-font-monaco urvanov-syntax-highlighter-os-mac print-yes notranslate" data-settings=" minimize scroll-mouseover" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;"> <div class="crayon-toolbar" data-settings=" mouseover overlay hide delay" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;"><span class="crayon-title"></span> <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;"><div class="crayon-button urvanov-syntax-highlighter-nums-button" title="Toggle Line Numbers"><div class="urvanov-syntax-highlighter-button-icon"></div></div><div class="crayon-button urvanov-syntax-highlighter-plain-button" title="Toggle Plain Code"><div class="urvanov-syntax-highlighter-button-icon"></div></div><div class="crayon-button urvanov-syntax-highlighter-wrap-button" title="Toggle Line Wrap"><div class="urvanov-syntax-highlighter-button-icon"></div></div><div class="crayon-button urvanov-syntax-highlighter-expand-button" title="Expand Code"><div class="urvanov-syntax-highlighter-button-icon"></div></div><div class="crayon-button urvanov-syntax-highlighter-copy-button" title="Copy"><div class="urvanov-syntax-highlighter-button-icon"></div></div><div class="crayon-button urvanov-syntax-highlighter-popup-button" title="Open Code In New Window"><div class="urvanov-syntax-highlighter-button-icon"></div></div></div></div> <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;"></div> <div class="urvanov-syntax-highlighter-plain-wrap"><textarea wrap="soft" class="urvanov-syntax-highlighter-plain print-no" data-settings="dblclick" readonly style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;"> function runAsync (callback) { return function (req, res, next) { callback(req, res, next) .catch(next) } }</textarea></div> <div class="urvanov-syntax-highlighter-main" style=""> <table class="crayon-table"> <tr class="urvanov-syntax-highlighter-row"> <td class="crayon-nums " data-settings="show"> <div class="urvanov-syntax-highlighter-nums-content" style="font-size: 12px !important; line-height: 15px !important;"><div class="crayon-num" data-line="urvanov-syntax-highlighter-6747339a14bdd707893786-1">1</div><div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-6747339a14bdd707893786-2">2</div><div class="crayon-num" data-line="urvanov-syntax-highlighter-6747339a14bdd707893786-3">3</div><div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-6747339a14bdd707893786-4">4</div><div class="crayon-num" data-line="urvanov-syntax-highlighter-6747339a14bdd707893786-5">5</div><div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-6747339a14bdd707893786-6">6</div></div> </td> <td class="urvanov-syntax-highlighter-code"><div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;"><div class="crayon-line" id="urvanov-syntax-highlighter-6747339a14bdd707893786-1"><span class="crayon-h">  </span><span class="crayon-t">function</span><span class="crayon-h"> </span><span class="crayon-e">runAsync</span><span class="crayon-h"> </span><span class="crayon-sy">(</span><span class="crayon-v">callback</span><span class="crayon-sy">)</span><span class="crayon-h"> </span><span class="crayon-sy">{</span></div><div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-6747339a14bdd707893786-2"><span class="crayon-h">    </span><span class="crayon-st">return</span><span class="crayon-h"> </span><span class="crayon-t">function</span><span class="crayon-h"> </span><span class="crayon-sy">(</span><span class="crayon-v">req</span><span class="crayon-sy">,</span><span class="crayon-h"> </span><span class="crayon-v">res</span><span class="crayon-sy">,</span><span class="crayon-h"> </span><span class="crayon-v">next</span><span class="crayon-sy">)</span><span class="crayon-h"> </span><span class="crayon-sy">{</span></div><div class="crayon-line" id="urvanov-syntax-highlighter-6747339a14bdd707893786-3"><span class="crayon-h">      </span><span class="crayon-e">callback</span><span class="crayon-sy">(</span><span class="crayon-v">req</span><span class="crayon-sy">,</span><span class="crayon-h"> </span><span class="crayon-v">res</span><span class="crayon-sy">,</span><span class="crayon-h"> </span><span class="crayon-v">next</span><span class="crayon-sy">)</span></div><div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-6747339a14bdd707893786-4"><span class="crayon-h">      </span><span class="crayon-sy">.</span><span class="crayon-st">catch</span><span class="crayon-sy">(</span><span class="crayon-v">next</span><span class="crayon-sy">)</span></div><div class="crayon-line" id="urvanov-syntax-highlighter-6747339a14bdd707893786-5"><span class="crayon-h">    </span><span class="crayon-sy">}</span></div><div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-6747339a14bdd707893786-6"><span class="crayon-h">  </span><span class="crayon-sy">}</span></div></div></td> </tr> </table> </div> </div>  <p></p> <div class="wp-block-spacer" style="height: 15px" aria-hidden="true"></div> <p>The function above wraps your calls nicely but I won’t explain it in detail here (maybe in a future post). For now, just add it to the script.</p> <h3>Add a Document-Retrieval Function</h3> <p>The database connectivity in the script is as basic as the earlier posts in this series. Select a <a href="https://www.couchbase.com/blog/scopes-and-collections-for-modern-multi-tenant-applications-couchbase-7-0/?ref=blog" target="_blank" rel="noopener">Bucket and Collection</a>, then use the <code>get()</code> function to retrieve a document based on a given document ID.</p> <p>First comes the connectivity piece. If you have a different username, password, Bucket or Collection, substitute it here:</p> <div id="urvanov-syntax-highlighter-6747339a14be0734376387" class="urvanov-syntax-highlighter-syntax crayon-theme-classic urvanov-syntax-highlighter-font-monaco urvanov-syntax-highlighter-os-mac print-yes notranslate" data-settings=" minimize scroll-mouseover" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;"> <div class="crayon-toolbar" data-settings=" mouseover overlay hide delay" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;"><span class="crayon-title"></span> <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;"><div class="crayon-button urvanov-syntax-highlighter-nums-button" title="Toggle Line Numbers"><div class="urvanov-syntax-highlighter-button-icon"></div></div><div class="crayon-button urvanov-syntax-highlighter-plain-button" title="Toggle Plain Code"><div class="urvanov-syntax-highlighter-button-icon"></div></div><div class="crayon-button urvanov-syntax-highlighter-wrap-button" title="Toggle Line Wrap"><div class="urvanov-syntax-highlighter-button-icon"></div></div><div class="crayon-button urvanov-syntax-highlighter-expand-button" title="Expand Code"><div class="urvanov-syntax-highlighter-button-icon"></div></div><div class="crayon-button urvanov-syntax-highlighter-copy-button" title="Copy"><div class="urvanov-syntax-highlighter-button-icon"></div></div><div class="crayon-button urvanov-syntax-highlighter-popup-button" title="Open Code In New Window"><div class="urvanov-syntax-highlighter-button-icon"></div></div></div></div> <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;"></div> <div class="urvanov-syntax-highlighter-plain-wrap"><textarea wrap="soft" class="urvanov-syntax-highlighter-plain print-no" data-settings="dblclick" readonly style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;"> var cluster = new couchbase.Cluster("couchbase://localhost", { username: "Administrator", password: "Administrator" }); var bucket = cluster.bucket("travel-sample"); var collection = bucket.defaultCollection();</textarea></div> <div class="urvanov-syntax-highlighter-main" style=""> <table class="crayon-table"> <tr class="urvanov-syntax-highlighter-row"> <td class="crayon-nums " data-settings="show"> <div class="urvanov-syntax-highlighter-nums-content" style="font-size: 12px !important; line-height: 15px !important;"><div class="crayon-num" data-line="urvanov-syntax-highlighter-6747339a14be0734376387-1">1</div><div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-6747339a14be0734376387-2">2</div><div class="crayon-num" data-line="urvanov-syntax-highlighter-6747339a14be0734376387-3">3</div><div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-6747339a14be0734376387-4">4</div><div class="crayon-num" data-line="urvanov-syntax-highlighter-6747339a14be0734376387-5">5</div><div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-6747339a14be0734376387-6">6</div><div class="crayon-num" data-line="urvanov-syntax-highlighter-6747339a14be0734376387-7">7</div></div> </td> <td class="urvanov-syntax-highlighter-code"><div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;"><div class="crayon-line" id="urvanov-syntax-highlighter-6747339a14be0734376387-1"><span class="crayon-h">  </span><span class="crayon-t">var</span><span class="crayon-h"> </span><span class="crayon-v">cluster</span><span class="crayon-h"> </span><span class="crayon-o">=</span><span class="crayon-h"> </span><span class="crayon-r">new</span><span class="crayon-h"> </span><span class="crayon-v">couchbase</span><span class="crayon-sy">.</span><span class="crayon-e">Cluster</span><span class="crayon-sy">(</span><span class="crayon-s">"couchbase://localhost"</span><span class="crayon-sy">,</span><span class="crayon-h"> </span><span class="crayon-sy">{</span></div><div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-6747339a14be0734376387-2"><span class="crayon-h">    </span><span class="crayon-v">username</span><span class="crayon-o">:</span><span class="crayon-h"> </span><span class="crayon-s">"Administrator"</span><span class="crayon-sy">,</span></div><div class="crayon-line" id="urvanov-syntax-highlighter-6747339a14be0734376387-3"><span class="crayon-h">    </span><span class="crayon-v">password</span><span class="crayon-o">:</span><span class="crayon-h"> </span><span class="crayon-s">"Administrator"</span></div><div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-6747339a14be0734376387-4"><span class="crayon-h">  </span><span class="crayon-sy">}</span><span class="crayon-sy">)</span><span class="crayon-sy">;</span></div><div class="crayon-line" id="urvanov-syntax-highlighter-6747339a14be0734376387-5"> </div><div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-6747339a14be0734376387-6"><span class="crayon-h">  </span><span class="crayon-t">var</span><span class="crayon-h"> </span><span class="crayon-v">bucket</span><span class="crayon-h"> </span><span class="crayon-o">=</span><span class="crayon-h"> </span><span class="crayon-v">cluster</span><span class="crayon-sy">.</span><span class="crayon-e">bucket</span><span class="crayon-sy">(</span><span class="crayon-s">"travel-sample"</span><span class="crayon-sy">)</span><span class="crayon-sy">;</span></div><div class="crayon-line" id="urvanov-syntax-highlighter-6747339a14be0734376387-7"><span class="crayon-h">  </span><span class="crayon-t">var</span><span class="crayon-h"> </span><span class="crayon-v">collection</span><span class="crayon-h"> </span><span class="crayon-o">=</span><span class="crayon-h"> </span><span class="crayon-v">bucket</span><span class="crayon-sy">.</span><span class="crayon-e">defaultCollection</span><span class="crayon-sy">(</span><span class="crayon-sy">)</span><span class="crayon-sy">;</span></div></div></td> </tr> </table> </div> </div>  <p></p> <div class="wp-block-spacer" style="height: 15px" aria-hidden="true"></div> <p>Note that I host the app on a server on my network that also hosts the database (<code>localhost</code>). But I access the app from my dev laptop, so in the web browser samples below you’ll see the IP address <code>192.168.0.158</code> hitting the REST API.</p> <p>Now let’s look at the main function for document retrieval:</p> <div id="urvanov-syntax-highlighter-6747339a14be2213622929" class="urvanov-syntax-highlighter-syntax crayon-theme-classic urvanov-syntax-highlighter-font-monaco urvanov-syntax-highlighter-os-mac print-yes notranslate" data-settings=" minimize scroll-mouseover" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;"> <div class="crayon-toolbar" data-settings=" mouseover overlay hide delay" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;"><span class="crayon-title"></span> <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;"><div class="crayon-button urvanov-syntax-highlighter-nums-button" title="Toggle Line Numbers"><div class="urvanov-syntax-highlighter-button-icon"></div></div><div class="crayon-button urvanov-syntax-highlighter-plain-button" title="Toggle Plain Code"><div class="urvanov-syntax-highlighter-button-icon"></div></div><div class="crayon-button urvanov-syntax-highlighter-wrap-button" title="Toggle Line Wrap"><div class="urvanov-syntax-highlighter-button-icon"></div></div><div class="crayon-button urvanov-syntax-highlighter-expand-button" title="Expand Code"><div class="urvanov-syntax-highlighter-button-icon"></div></div><div class="crayon-button urvanov-syntax-highlighter-copy-button" title="Copy"><div class="urvanov-syntax-highlighter-button-icon"></div></div><div class="crayon-button urvanov-syntax-highlighter-popup-button" title="Open Code In New Window"><div class="urvanov-syntax-highlighter-button-icon"></div></div></div></div> <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;"></div> <div class="urvanov-syntax-highlighter-plain-wrap"><textarea wrap="soft" class="urvanov-syntax-highlighter-plain print-no" data-settings="dblclick" readonly style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;"> var getDoc = async (key) =&gt; { var result = await collection.get(key); console.log(result) return result };</textarea></div> <div class="urvanov-syntax-highlighter-main" style=""> <table class="crayon-table"> <tr class="urvanov-syntax-highlighter-row"> <td class="crayon-nums " data-settings="show"> <div class="urvanov-syntax-highlighter-nums-content" style="font-size: 12px !important; line-height: 15px !important;"><div class="crayon-num" data-line="urvanov-syntax-highlighter-6747339a14be2213622929-1">1</div><div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-6747339a14be2213622929-2">2</div><div class="crayon-num" data-line="urvanov-syntax-highlighter-6747339a14be2213622929-3">3</div><div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-6747339a14be2213622929-4">4</div><div class="crayon-num" data-line="urvanov-syntax-highlighter-6747339a14be2213622929-5">5</div></div> </td> <td class="urvanov-syntax-highlighter-code"><div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;"><div class="crayon-line" id="urvanov-syntax-highlighter-6747339a14be2213622929-1"><span class="crayon-h">  </span><span class="crayon-t">var</span><span class="crayon-h"> </span><span class="crayon-v">getDoc</span><span class="crayon-h"> </span><span class="crayon-o">=</span><span class="crayon-h"> </span><span class="crayon-e">async</span><span class="crayon-h"> </span><span class="crayon-sy">(</span><span class="crayon-v">key</span><span class="crayon-sy">)</span><span class="crayon-h"> </span><span class="crayon-o">=&</span><span class="crayon-v">gt</span><span class="crayon-sy">;</span><span class="crayon-h"> </span><span class="crayon-sy">{</span></div><div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-6747339a14be2213622929-2"><span class="crayon-h">      </span><span class="crayon-t">var</span><span class="crayon-h"> </span><span class="crayon-v">result</span><span class="crayon-h"> </span><span class="crayon-o">=</span><span class="crayon-h"> </span><span class="crayon-e">await </span><span class="crayon-v">collection</span><span class="crayon-sy">.</span><span class="crayon-e">get</span><span class="crayon-sy">(</span><span class="crayon-v">key</span><span class="crayon-sy">)</span><span class="crayon-sy">;</span></div><div class="crayon-line" id="urvanov-syntax-highlighter-6747339a14be2213622929-3"><span class="crayon-h">      </span><span class="crayon-v">console</span><span class="crayon-sy">.</span><span class="crayon-e">log</span><span class="crayon-sy">(</span><span class="crayon-v">result</span><span class="crayon-sy">)</span></div><div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-6747339a14be2213622929-4"><span class="crayon-h">      </span><span class="crayon-st">return</span><span class="crayon-h"> </span><span class="crayon-i">result</span></div><div class="crayon-line" id="urvanov-syntax-highlighter-6747339a14be2213622929-5"><span class="crayon-h">  </span><span class="crayon-sy">}</span><span class="crayon-sy">;</span></div></div></td> </tr> </table> </div> </div>  <p></p> <div class="wp-block-spacer" style="height: 15px" aria-hidden="true"></div> <p>We use the <code>collection</code> variable, which is the Couchbase database connection to the Bucket, etc., defined earlier. The <code>get()</code> function takes one input: a string with a document ID. For example, we used <code>hotel_5336</code> in the previous posts in this series.</p> <h3>Running the REST API</h3> <p>The HTTP server for the REST API still needs to run as well. It hasn’t changed since the first test app in this post:</p> <div id="urvanov-syntax-highlighter-6747339a14be4565237065" class="urvanov-syntax-highlighter-syntax crayon-theme-classic urvanov-syntax-highlighter-font-monaco urvanov-syntax-highlighter-os-mac print-yes notranslate" data-settings=" minimize scroll-mouseover" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;"> <div class="crayon-toolbar" data-settings=" mouseover overlay hide delay" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;"><span class="crayon-title"></span> <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;"><div class="crayon-button urvanov-syntax-highlighter-nums-button" title="Toggle Line Numbers"><div class="urvanov-syntax-highlighter-button-icon"></div></div><div class="crayon-button urvanov-syntax-highlighter-plain-button" title="Toggle Plain Code"><div class="urvanov-syntax-highlighter-button-icon"></div></div><div class="crayon-button urvanov-syntax-highlighter-wrap-button" title="Toggle Line Wrap"><div class="urvanov-syntax-highlighter-button-icon"></div></div><div class="crayon-button urvanov-syntax-highlighter-expand-button" title="Expand Code"><div class="urvanov-syntax-highlighter-button-icon"></div></div><div class="crayon-button urvanov-syntax-highlighter-copy-button" title="Copy"><div class="urvanov-syntax-highlighter-button-icon"></div></div><div class="crayon-button urvanov-syntax-highlighter-popup-button" title="Open Code In New Window"><div class="urvanov-syntax-highlighter-button-icon"></div></div></div></div> <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;"></div> <div class="urvanov-syntax-highlighter-plain-wrap"><textarea wrap="soft" class="urvanov-syntax-highlighter-plain print-no" data-settings="dblclick" readonly style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;"> app.listen(3000, () =&gt; console.log('Listening on port 3000'));</textarea></div> <div class="urvanov-syntax-highlighter-main" style=""> <table class="crayon-table"> <tr class="urvanov-syntax-highlighter-row"> <td class="crayon-nums " data-settings="show"> <div class="urvanov-syntax-highlighter-nums-content" style="font-size: 12px !important; line-height: 15px !important;"><div class="crayon-num" data-line="urvanov-syntax-highlighter-6747339a14be4565237065-1">1</div></div> </td> <td class="urvanov-syntax-highlighter-code"><div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;"><div class="crayon-line" id="urvanov-syntax-highlighter-6747339a14be4565237065-1"><span class="crayon-v">app</span><span class="crayon-sy">.</span><span class="crayon-e">listen</span><span class="crayon-sy">(</span><span class="crayon-cn">3000</span><span class="crayon-sy">,</span><span class="crayon-h"> </span><span class="crayon-sy">(</span><span class="crayon-sy">)</span><span class="crayon-h"> </span><span class="crayon-o">=&</span><span class="crayon-v">gt</span><span class="crayon-sy">;</span><span class="crayon-h"> </span><span class="crayon-v">console</span><span class="crayon-sy">.</span><span class="crayon-e">log</span><span class="crayon-sy">(</span><span class="crayon-s">'Listening on port 3000'</span><span class="crayon-sy">)</span><span class="crayon-sy">)</span><span class="crayon-sy">;</span></div></div></td> </tr> </table> </div> </div>  <p></p> <div class="wp-block-spacer" style="height: 15px" aria-hidden="true"></div> <p>That covers all the code; a full listing is included below. Now you can run the server as before (<code> node app.js</code>) and provide a document ID through the web browser – e.g., <code>http://192.168.0.158:3000/get/hotel_5336</code>.</p> <p>The requested document is printed in the console and returned to the browser:</p> <div class="wp-block-spacer" style="height: 15px" aria-hidden="true"></div> <p><a href="https://www.couchbase.com/blog/wp-content/uploads/2021/08/get-function-node-express-couchbase.png"><img decoding="async" class="aligncenter size-medium_large wp-image-11744" src="https://www.couchbase.com/blog/wp-content/uploads/2021/08/get-function-node-express-couchbase-768x748.png" alt="Database retrieval REST API with Node.js and Couchbase" width="768" height="748" srcset="https://www.couchbase.com/blog/wp-content/uploads/sites/1/2021/08/get-function-node-express-couchbase-768x748.png 768w, https://www.couchbase.com/blog/wp-content/uploads/sites/1/2021/08/get-function-node-express-couchbase-300x292.png 300w, https://www.couchbase.com/blog/wp-content/uploads/sites/1/2021/08/get-function-node-express-couchbase-50x50.png 50w, https://www.couchbase.com/blog/wp-content/uploads/sites/1/2021/08/get-function-node-express-couchbase-20x20.png 20w, https://www.couchbase.com/blog/wp-content/uploads/sites/1/2021/08/get-function-node-express-couchbase.png 960w" sizes="(max-width: 768px) 100vw, 768px" /></a></p> <div class="wp-block-spacer" style="height: 15px" aria-hidden="true"></div> <h2>Full Code Sample</h2> <p></p> <div id="urvanov-syntax-highlighter-6747339a14be6272616673" class="urvanov-syntax-highlighter-syntax crayon-theme-classic urvanov-syntax-highlighter-font-monaco urvanov-syntax-highlighter-os-mac print-yes notranslate" data-settings=" minimize scroll-mouseover" style=" margin-top: 12px; margin-bottom: 12px; font-size: 12px !important; line-height: 15px !important;"> <div class="crayon-toolbar" data-settings=" mouseover overlay hide delay" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;"><span class="crayon-title"></span> <div class="crayon-tools" style="font-size: 12px !important;height: 18px !important; line-height: 18px !important;"><div class="crayon-button urvanov-syntax-highlighter-nums-button" title="Toggle Line Numbers"><div class="urvanov-syntax-highlighter-button-icon"></div></div><div class="crayon-button urvanov-syntax-highlighter-plain-button" title="Toggle Plain Code"><div class="urvanov-syntax-highlighter-button-icon"></div></div><div class="crayon-button urvanov-syntax-highlighter-wrap-button" title="Toggle Line Wrap"><div class="urvanov-syntax-highlighter-button-icon"></div></div><div class="crayon-button urvanov-syntax-highlighter-expand-button" title="Expand Code"><div class="urvanov-syntax-highlighter-button-icon"></div></div><div class="crayon-button urvanov-syntax-highlighter-copy-button" title="Copy"><div class="urvanov-syntax-highlighter-button-icon"></div></div><div class="crayon-button urvanov-syntax-highlighter-popup-button" title="Open Code In New Window"><div class="urvanov-syntax-highlighter-button-icon"></div></div></div></div> <div class="crayon-info" style="min-height: 16.8px !important; line-height: 16.8px !important;"></div> <div class="urvanov-syntax-highlighter-plain-wrap"><textarea wrap="soft" class="urvanov-syntax-highlighter-plain print-no" data-settings="dblclick" readonly style="-moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4; font-size: 12px !important; line-height: 15px !important;"> var app = require('express')(); var couchbase = require("couchbase"); async function main(){ app.get('/get/:docid', runAsync(async (req, res) =&gt; { var docid = req.params.docid; var docjson = await getDoc(docid, function(err, result){ res.json(result.content) }); res.json(docjson.content); })); app.listen(3000, () =&gt; console.log('Listening on port 3000')); function runAsync (callback) { return function (req, res, next) { callback(req, res, next) .catch(next) } } var cluster = new couchbase.Cluster("couchbase://localhost", { username: "Administrator", password: "Administrator" }); var bucket = cluster.bucket("travel-sample"); var collection = bucket.defaultCollection(); var getDoc = async (key) =&gt; { var result = await collection.get(key); console.log(result) return result }; } main();</textarea></div> <div class="urvanov-syntax-highlighter-main" style=""> <table class="crayon-table"> <tr class="urvanov-syntax-highlighter-row"> <td class="crayon-nums " data-settings="show"> <div class="urvanov-syntax-highlighter-nums-content" style="font-size: 12px !important; line-height: 15px !important;"><div class="crayon-num" data-line="urvanov-syntax-highlighter-6747339a14be6272616673-1">1</div><div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-6747339a14be6272616673-2">2</div><div class="crayon-num" data-line="urvanov-syntax-highlighter-6747339a14be6272616673-3">3</div><div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-6747339a14be6272616673-4">4</div><div class="crayon-num" data-line="urvanov-syntax-highlighter-6747339a14be6272616673-5">5</div><div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-6747339a14be6272616673-6">6</div><div class="crayon-num" data-line="urvanov-syntax-highlighter-6747339a14be6272616673-7">7</div><div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-6747339a14be6272616673-8">8</div><div class="crayon-num" data-line="urvanov-syntax-highlighter-6747339a14be6272616673-9">9</div><div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-6747339a14be6272616673-10">10</div><div class="crayon-num" data-line="urvanov-syntax-highlighter-6747339a14be6272616673-11">11</div><div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-6747339a14be6272616673-12">12</div><div class="crayon-num" data-line="urvanov-syntax-highlighter-6747339a14be6272616673-13">13</div><div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-6747339a14be6272616673-14">14</div><div class="crayon-num" data-line="urvanov-syntax-highlighter-6747339a14be6272616673-15">15</div><div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-6747339a14be6272616673-16">16</div><div class="crayon-num" data-line="urvanov-syntax-highlighter-6747339a14be6272616673-17">17</div><div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-6747339a14be6272616673-18">18</div><div class="crayon-num" data-line="urvanov-syntax-highlighter-6747339a14be6272616673-19">19</div><div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-6747339a14be6272616673-20">20</div><div class="crayon-num" data-line="urvanov-syntax-highlighter-6747339a14be6272616673-21">21</div><div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-6747339a14be6272616673-22">22</div><div class="crayon-num" data-line="urvanov-syntax-highlighter-6747339a14be6272616673-23">23</div><div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-6747339a14be6272616673-24">24</div><div class="crayon-num" data-line="urvanov-syntax-highlighter-6747339a14be6272616673-25">25</div><div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-6747339a14be6272616673-26">26</div><div class="crayon-num" data-line="urvanov-syntax-highlighter-6747339a14be6272616673-27">27</div><div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-6747339a14be6272616673-28">28</div><div class="crayon-num" data-line="urvanov-syntax-highlighter-6747339a14be6272616673-29">29</div><div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-6747339a14be6272616673-30">30</div><div class="crayon-num" data-line="urvanov-syntax-highlighter-6747339a14be6272616673-31">31</div><div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-6747339a14be6272616673-32">32</div><div class="crayon-num" data-line="urvanov-syntax-highlighter-6747339a14be6272616673-33">33</div><div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-6747339a14be6272616673-34">34</div><div class="crayon-num" data-line="urvanov-syntax-highlighter-6747339a14be6272616673-35">35</div><div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-6747339a14be6272616673-36">36</div><div class="crayon-num" data-line="urvanov-syntax-highlighter-6747339a14be6272616673-37">37</div><div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-6747339a14be6272616673-38">38</div><div class="crayon-num" data-line="urvanov-syntax-highlighter-6747339a14be6272616673-39">39</div><div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-6747339a14be6272616673-40">40</div><div class="crayon-num" data-line="urvanov-syntax-highlighter-6747339a14be6272616673-41">41</div><div class="crayon-num crayon-striped-num" data-line="urvanov-syntax-highlighter-6747339a14be6272616673-42">42</div></div> </td> <td class="urvanov-syntax-highlighter-code"><div class="crayon-pre" style="font-size: 12px !important; line-height: 15px !important; -moz-tab-size:4; -o-tab-size:4; -webkit-tab-size:4; tab-size:4;"><div class="crayon-line" id="urvanov-syntax-highlighter-6747339a14be6272616673-1"><span class="crayon-t">var</span><span class="crayon-h"> </span><span class="crayon-v">app</span><span class="crayon-h"> </span><span class="crayon-o">=</span><span class="crayon-h"> </span><span class="crayon-e">require</span><span class="crayon-sy">(</span><span class="crayon-s">'express'</span><span class="crayon-sy">)</span><span class="crayon-sy">(</span><span class="crayon-sy">)</span><span class="crayon-sy">;</span></div><div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-6747339a14be6272616673-2"> </div><div class="crayon-line" id="urvanov-syntax-highlighter-6747339a14be6272616673-3"><span class="crayon-t">var</span><span class="crayon-h"> </span><span class="crayon-v">couchbase</span><span class="crayon-h"> </span><span class="crayon-o">=</span><span class="crayon-h"> </span><span class="crayon-e">require</span><span class="crayon-sy">(</span><span class="crayon-s">"couchbase"</span><span class="crayon-sy">)</span><span class="crayon-sy">;</span></div><div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-6747339a14be6272616673-4"> </div><div class="crayon-line" id="urvanov-syntax-highlighter-6747339a14be6272616673-5"><span class="crayon-e">async </span><span class="crayon-t">function</span><span class="crayon-h"> </span><span class="crayon-e">main</span><span class="crayon-sy">(</span><span class="crayon-sy">)</span><span class="crayon-sy">{</span></div><div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-6747339a14be6272616673-6"> </div><div class="crayon-line" id="urvanov-syntax-highlighter-6747339a14be6272616673-7"><span class="crayon-h">  </span><span class="crayon-v">app</span><span class="crayon-sy">.</span><span class="crayon-e">get</span><span class="crayon-sy">(</span><span class="crayon-s">'/get/:docid'</span><span class="crayon-sy">,</span></div><div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-6747339a14be6272616673-8"><span class="crayon-h">    </span><span class="crayon-e">runAsync</span><span class="crayon-sy">(</span><span class="crayon-e">async</span><span class="crayon-h"> </span><span class="crayon-sy">(</span><span class="crayon-v">req</span><span class="crayon-sy">,</span><span class="crayon-h"> </span><span class="crayon-v">res</span><span class="crayon-sy">)</span><span class="crayon-h"> </span><span class="crayon-o">=&</span><span class="crayon-v">gt</span><span class="crayon-sy">;</span><span class="crayon-h"> </span><span class="crayon-sy">{</span></div><div class="crayon-line" id="urvanov-syntax-highlighter-6747339a14be6272616673-9"><span class="crayon-h">      </span><span class="crayon-t">var</span><span class="crayon-h"> </span><span class="crayon-v">docid</span><span class="crayon-h"> </span><span class="crayon-o">=</span><span class="crayon-h"> </span><span class="crayon-v">req</span><span class="crayon-sy">.</span><span class="crayon-v">params</span><span class="crayon-sy">.</span><span class="crayon-v">docid</span><span class="crayon-sy">;</span></div><div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-6747339a14be6272616673-10"><span class="crayon-h">      </span><span class="crayon-t">var</span><span class="crayon-h"> </span><span class="crayon-v">docjson</span><span class="crayon-h"> </span><span class="crayon-o">=</span><span class="crayon-h"> </span><span class="crayon-e">await </span><span class="crayon-e">getDoc</span><span class="crayon-sy">(</span><span class="crayon-v">docid</span><span class="crayon-sy">,</span><span class="crayon-h"> </span><span class="crayon-t">function</span><span class="crayon-sy">(</span><span class="crayon-v">err</span><span class="crayon-sy">,</span><span class="crayon-h"> </span><span class="crayon-v">result</span><span class="crayon-sy">)</span><span class="crayon-sy">{</span></div><div class="crayon-line" id="urvanov-syntax-highlighter-6747339a14be6272616673-11"><span class="crayon-h">        </span><span class="crayon-v">res</span><span class="crayon-sy">.</span><span class="crayon-e">json</span><span class="crayon-sy">(</span><span class="crayon-v">result</span><span class="crayon-sy">.</span><span class="crayon-v">content</span><span class="crayon-sy">)</span></div><div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-6747339a14be6272616673-12"><span class="crayon-h">      </span><span class="crayon-sy">}</span><span class="crayon-sy">)</span><span class="crayon-sy">;</span></div><div class="crayon-line" id="urvanov-syntax-highlighter-6747339a14be6272616673-13"> </div><div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-6747339a14be6272616673-14"><span class="crayon-h">      </span><span class="crayon-v">res</span><span class="crayon-sy">.</span><span class="crayon-e">json</span><span class="crayon-sy">(</span><span class="crayon-v">docjson</span><span class="crayon-sy">.</span><span class="crayon-v">content</span><span class="crayon-sy">)</span><span class="crayon-sy">;</span></div><div class="crayon-line" id="urvanov-syntax-highlighter-6747339a14be6272616673-15"><span class="crayon-h">  </span><span class="crayon-sy">}</span><span class="crayon-sy">)</span><span class="crayon-sy">)</span><span class="crayon-sy">;</span></div><div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-6747339a14be6272616673-16"> </div><div class="crayon-line" id="urvanov-syntax-highlighter-6747339a14be6272616673-17"><span class="crayon-h">  </span><span class="crayon-v">app</span><span class="crayon-sy">.</span><span class="crayon-e">listen</span><span class="crayon-sy">(</span><span class="crayon-cn">3000</span><span class="crayon-sy">,</span><span class="crayon-h"> </span><span class="crayon-sy">(</span><span class="crayon-sy">)</span><span class="crayon-h"> </span><span class="crayon-o">=&</span><span class="crayon-v">gt</span><span class="crayon-sy">;</span><span class="crayon-h"> </span><span class="crayon-v">console</span><span class="crayon-sy">.</span><span class="crayon-e">log</span><span class="crayon-sy">(</span><span class="crayon-s">'Listening on port 3000'</span><span class="crayon-sy">)</span><span class="crayon-sy">)</span><span class="crayon-sy">;</span></div><div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-6747339a14be6272616673-18"> </div><div class="crayon-line" id="urvanov-syntax-highlighter-6747339a14be6272616673-19"><span class="crayon-h">  </span><span class="crayon-t">function</span><span class="crayon-h"> </span><span class="crayon-e">runAsync</span><span class="crayon-h"> </span><span class="crayon-sy">(</span><span class="crayon-v">callback</span><span class="crayon-sy">)</span><span class="crayon-h"> </span><span class="crayon-sy">{</span></div><div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-6747339a14be6272616673-20"><span class="crayon-h">    </span><span class="crayon-st">return</span><span class="crayon-h"> </span><span class="crayon-t">function</span><span class="crayon-h"> </span><span class="crayon-sy">(</span><span class="crayon-v">req</span><span class="crayon-sy">,</span><span class="crayon-h"> </span><span class="crayon-v">res</span><span class="crayon-sy">,</span><span class="crayon-h"> </span><span class="crayon-v">next</span><span class="crayon-sy">)</span><span class="crayon-h"> </span><span class="crayon-sy">{</span></div><div class="crayon-line" id="urvanov-syntax-highlighter-6747339a14be6272616673-21"><span class="crayon-h">      </span><span class="crayon-e">callback</span><span class="crayon-sy">(</span><span class="crayon-v">req</span><span class="crayon-sy">,</span><span class="crayon-h"> </span><span class="crayon-v">res</span><span class="crayon-sy">,</span><span class="crayon-h"> </span><span class="crayon-v">next</span><span class="crayon-sy">)</span></div><div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-6747339a14be6272616673-22"><span class="crayon-h">      </span><span class="crayon-sy">.</span><span class="crayon-st">catch</span><span class="crayon-sy">(</span><span class="crayon-v">next</span><span class="crayon-sy">)</span></div><div class="crayon-line" id="urvanov-syntax-highlighter-6747339a14be6272616673-23"><span class="crayon-h">    </span><span class="crayon-sy">}</span></div><div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-6747339a14be6272616673-24"><span class="crayon-h">  </span><span class="crayon-sy">}</span></div><div class="crayon-line" id="urvanov-syntax-highlighter-6747339a14be6272616673-25"> </div><div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-6747339a14be6272616673-26"><span class="crayon-h">  </span><span class="crayon-t">var</span><span class="crayon-h"> </span><span class="crayon-v">cluster</span><span class="crayon-h"> </span><span class="crayon-o">=</span><span class="crayon-h"> </span><span class="crayon-r">new</span><span class="crayon-h"> </span><span class="crayon-v">couchbase</span><span class="crayon-sy">.</span><span class="crayon-e">Cluster</span><span class="crayon-sy">(</span><span class="crayon-s">"couchbase://localhost"</span><span class="crayon-sy">,</span><span class="crayon-h"> </span><span class="crayon-sy">{</span></div><div class="crayon-line" id="urvanov-syntax-highlighter-6747339a14be6272616673-27"><span class="crayon-h">    </span><span class="crayon-v">username</span><span class="crayon-o">:</span><span class="crayon-h"> </span><span class="crayon-s">"Administrator"</span><span class="crayon-sy">,</span></div><div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-6747339a14be6272616673-28"><span class="crayon-h">    </span><span class="crayon-v">password</span><span class="crayon-o">:</span><span class="crayon-h"> </span><span class="crayon-s">"Administrator"</span></div><div class="crayon-line" id="urvanov-syntax-highlighter-6747339a14be6272616673-29"><span class="crayon-h">  </span><span class="crayon-sy">}</span><span class="crayon-sy">)</span><span class="crayon-sy">;</span></div><div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-6747339a14be6272616673-30"> </div><div class="crayon-line" id="urvanov-syntax-highlighter-6747339a14be6272616673-31"><span class="crayon-h">  </span><span class="crayon-t">var</span><span class="crayon-h"> </span><span class="crayon-v">bucket</span><span class="crayon-h"> </span><span class="crayon-o">=</span><span class="crayon-h"> </span><span class="crayon-v">cluster</span><span class="crayon-sy">.</span><span class="crayon-e">bucket</span><span class="crayon-sy">(</span><span class="crayon-s">"travel-sample"</span><span class="crayon-sy">)</span><span class="crayon-sy">;</span></div><div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-6747339a14be6272616673-32"><span class="crayon-h">  </span><span class="crayon-t">var</span><span class="crayon-h"> </span><span class="crayon-v">collection</span><span class="crayon-h"> </span><span class="crayon-o">=</span><span class="crayon-h"> </span><span class="crayon-v">bucket</span><span class="crayon-sy">.</span><span class="crayon-e">defaultCollection</span><span class="crayon-sy">(</span><span class="crayon-sy">)</span><span class="crayon-sy">;</span></div><div class="crayon-line" id="urvanov-syntax-highlighter-6747339a14be6272616673-33"> </div><div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-6747339a14be6272616673-34"><span class="crayon-h">  </span><span class="crayon-t">var</span><span class="crayon-h"> </span><span class="crayon-v">getDoc</span><span class="crayon-h"> </span><span class="crayon-o">=</span><span class="crayon-h"> </span><span class="crayon-e">async</span><span class="crayon-h"> </span><span class="crayon-sy">(</span><span class="crayon-v">key</span><span class="crayon-sy">)</span><span class="crayon-h"> </span><span class="crayon-o">=&</span><span class="crayon-v">gt</span><span class="crayon-sy">;</span><span class="crayon-h"> </span><span class="crayon-sy">{</span></div><div class="crayon-line" id="urvanov-syntax-highlighter-6747339a14be6272616673-35"><span class="crayon-h">      </span><span class="crayon-t">var</span><span class="crayon-h"> </span><span class="crayon-v">result</span><span class="crayon-h"> </span><span class="crayon-o">=</span><span class="crayon-h"> </span><span class="crayon-e">await </span><span class="crayon-v">collection</span><span class="crayon-sy">.</span><span class="crayon-e">get</span><span class="crayon-sy">(</span><span class="crayon-v">key</span><span class="crayon-sy">)</span><span class="crayon-sy">;</span></div><div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-6747339a14be6272616673-36"><span class="crayon-h">      </span><span class="crayon-v">console</span><span class="crayon-sy">.</span><span class="crayon-e">log</span><span class="crayon-sy">(</span><span class="crayon-v">result</span><span class="crayon-sy">)</span></div><div class="crayon-line" id="urvanov-syntax-highlighter-6747339a14be6272616673-37"><span class="crayon-h">      </span><span class="crayon-st">return</span><span class="crayon-h"> </span><span class="crayon-i">result</span></div><div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-6747339a14be6272616673-38"><span class="crayon-h">  </span><span class="crayon-sy">}</span><span class="crayon-sy">;</span></div><div class="crayon-line" id="urvanov-syntax-highlighter-6747339a14be6272616673-39"> </div><div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-6747339a14be6272616673-40"><span class="crayon-sy">}</span></div><div class="crayon-line" id="urvanov-syntax-highlighter-6747339a14be6272616673-41"> </div><div class="crayon-line crayon-striped-line" id="urvanov-syntax-highlighter-6747339a14be6272616673-42"><span class="crayon-e">main</span><span class="crayon-sy">(</span><span class="crayon-sy">)</span><span class="crayon-sy">;</span></div></div></td> </tr> </table> </div> </div>  <p></p> <div class="wp-block-spacer" style="height: 15px" aria-hidden="true"></div> <h2>Conclusion</h2> <p>In future posts I’ll cover how to build a database query, conduct full-text searches and more – all using different Express routes.</p> <p>In the meantime, take your application to the next level by doing some of the following:</p> <ul> <li style="list-style-type: none"> <ul> <li>Add error capturing.</li> <li>Create a authentication system, such as JSON Web Token or JWT (see <a href="https://docs.couchbase.com/nodejs-sdk/current/hello-world/sample-application.html?ref=blog" target="_blank" rel="noopener">this travel-sample demo project</a>).</li> <li>Read up on <a href="https://developer.couchbase.com/topic/nodejs/?ref=blog" target="_blank" rel="noopener">other Couchbase Node.js SDK functions</a> you can add to the app.</li> </ul> </li> </ul> <p><em>Catch up with the rest of the Node.js + Couchbase how-to series:</em></p> <ul> <li style="list-style-type: none"> <ul> <li><a href="https://www.couchbase.com/blog/get-started-nodejs-sdk-couchbase/?ref=blog" target="_blank" rel="noopener">How to Get Started with the Node.js SDK for Couchbase</a></li> <li><a href="https://www.couchbase.com/blog/how-to-create-nodejs-async-get-upsert-calls-with-couchbase/?ref=blog" target="_blank" rel="noopener">How to Create Async Get/Upsert Calls with Node.js and Couchbase</a></li> <li><a href="https://www.couchbase.com/blog/build-a-rest-api-with-node-js-express-and-couchbase/?ref=blog" target="_blank" rel="noopener">Build a REST-Based Application with Node.js, Express and Couchbase</a></li> <li><a href="https://www.couchbase.com/blog/how-to-query-json-data-n1ql-node-js-couchbase/?ref=blog" target="_blank" rel="noopener">How to Query JSON Data Using N1QL for Node.js and Couchbase</a></li> <li><a href="https://www.couchbase.com/blog/how-to-full-text-search-javascript-app/?ref=blog" target="_blank" rel="noopener">How to Add Full-Text Search Functionality to Your JavaScript App</a></li> </ul> </li> </ul> <p> </p> <div class="wp-block-spacer" style="height: 30px" aria-hidden="true"></div> <div style="text-align: center"><strong>Don’t just read about it – <em>try it out</em>:<br/ ><a href="https://www.couchbase.com/downloads/?ref=blog" target="_blank" rel="noopener">Download Couchbase and get building</a></strong></div> <div class="wp-block-spacer" style="height: 15px" aria-hidden="true"></div> <p> </p>  <div class="pp-multiple-authors-boxes-wrapper pp-multiple-authors-wrapper pp-multiple-authors-layout-simple_list multiple-authors-target-the-content box-post-id-14469 box-instance-id-1 ppma_boxes_14469" data-post_id="14469" data-instance_id="1" data-additional_class="pp-multiple-authors-layout-simple_list.multiple-authors-target-the-content" data-original_class="pp-multiple-authors-boxes-wrapper pp-multiple-authors-wrapper box-post-id-14469 box-instance-id-1"> <span class="ppma-layout-prefix"></span> <div class="ppma-author-category-wrap"> <span class="ppma-category-group ppma-category-group-1 category-index-0"> <ul class="pp-multiple-authors-boxes-ul author-ul-0"> <li 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class="heateorSssClear"></div></div> </div> <div class="entry-meta"> <ul class="meta-list">  <li class="meta-cat"> <span>Posted in:</span> <a href="https://www.couchbase.com/blog/category/couchbase-sdk/" rel="category tag">Couchbase SDK</a>, <a href="https://www.couchbase.com/blog/category/javascript/" rel="category tag">JavaScript</a>, <a href="https://www.couchbase.com/blog/category/node-js/" rel="category tag">Node.js</a>, <a href="https://www.couchbase.com/blog/category/couchbase-server/scopes-and-collections/" rel="category tag">Scopes and Collections</a> </li>  <li class="meta-tag"> <span>Tagged in:</span> <a href="https://www.couchbase.com/blog/tag/async-function/" rel="tag">async function</a>, <a href="https://www.couchbase.com/blog/tag/document-database/" rel="tag">document database</a>, <a href="https://www.couchbase.com/blog/tag/express/" rel="tag">express</a>, <a href="https://www.couchbase.com/blog/tag/javascript/" rel="tag">javascript</a>, <a href="https://www.couchbase.com/blog/tag/json/" rel="tag">JSON</a>, <a href="https://www.couchbase.com/blog/tag/node-js/" rel="tag">Node.js</a>, <a href="https://www.couchbase.com/blog/tag/node-js-sdk/" rel="tag">node.js SDK</a>, <a href="https://www.couchbase.com/blog/tag/nosql/" rel="tag">nosql</a>, <a href="https://www.couchbase.com/blog/tag/rest-api/" rel="tag">REST API</a> </li> </ul> </div> </article> <h2 class="widget-title">Author</h2> <div class="author-profile"> <a class="author-profile-avatar" href="https://www.couchbase.com/blog/author/tylermitchell/" title="Posts by Tyler Mitchell - Senior Product Marketing Manager"><img alt='' src='https://secure.gravatar.com/avatar/f386adafc671ea78fbd52c66f2c8dd76?s=65&d=mm&r=g' srcset='https://secure.gravatar.com/avatar/f386adafc671ea78fbd52c66f2c8dd76?s=130&d=mm&r=g 2x' class='avatar avatar-65 photo' height='65' width='65' loading='lazy' decoding='async'/></a> <div class="author-profile-info"> <h3 class="author-profile-title"> Posted by Tyler Mitchell - Senior Product Marketing Manager </h3> <div class="author-description"> <p>Works as Senior Product Marketing Manager at Couchbase, helping bring knowledge about products into the public limelight while also supporting our field teams with valuable content. His personal passion is all things geospatial, having worked in GIS for half his career. Now AI and Vector Search is top of mind.</p> </div> <div class="author-profile-links"> <a href="https://www.couchbase.com/blog/author/tylermitchell/"><i class="fa fa-pencil-square"></i> All Posts</a> </div> </div> </div>  <div class="share-comment show"> <a class="comments-toggle button" href="#"> <span><i class="fa fa-comments"></i> Show comments </span> <span><i class="fa fa-times"></i> Hide comments</span> </a> </div> <div id="comments" class="comments-area show"> <h3 class="comments-title"> <span>One Comment</span> </h3> <ol class="comment-list"> <li class="pingback even thread-even depth-1 clearfix" id="li-comment-20120"> <div class="comment-block" id="comment-20120"> <div class="comment-wrap"> <img alt='' src='https://secure.gravatar.com/avatar/?s=75&d=mm&r=g' srcset='https://secure.gravatar.com/avatar/?s=150&d=mm&r=g 2x' class='avatar avatar-75 photo avatar-default' height='75' width='75' loading='lazy' decoding='async'/> <div class="comment-info"> <cite class="comment-cite"> <a href="https://51posts.com/2021/09/05/23/52/51/4843/" class="url" rel="ugc external nofollow">Build a REST-Based Application with Node.js, Express and Couchbase - 51posts</a> </cite> <a class="comment-time" href="https://www.couchbase.com/blog/build-a-rest-api-with-node-js-express-and-couchbase/#comment-20120">September 6, 2021 at 12:53 am</a> </div> <div class="comment-content"> <p>[…] post Build a REST-Based Application with Node.js, Express and Couchbase appeared first on The Couchbase […]</p> <p class="reply"> <a rel="nofollow" class="comment-reply-login" href="https://www.couchbase.com/blog/wp-login.php?redirect_to=https%3A%2F%2Fwww.couchbase.com%2Fblog%2Fbuild-a-rest-api-with-node-js-express-and-couchbase%2F">Log in to Reply</a> </p> </div> </div> </div> </li> </ol> <div id="respond" class="comment-respond"> <h3 id="reply-title" class="comment-reply-title"><span>Leave a reply</span> <small><a rel="nofollow" id="cancel-comment-reply-link" href="/blog/build-a-rest-api-with-node-js-express-and-couchbase/#respond" style="display:none;">Cancel reply</a></small></h3><p class="must-log-in">You must be <a href="https://www.couchbase.com/blog/wp-login.php?redirect_to=https%3A%2F%2Fwww.couchbase.com%2Fblog%2Fbuild-a-rest-api-with-node-js-express-and-couchbase%2F">logged in</a> to post a comment.</p><div class="heateor_sl_outer_login_container"><div class="heateor_sl_title">Login with your Social ID</div><div class="heateor_sl_login_container"><ul class="heateor_sl_login_ul"><li><i class="heateorSlLogin heateorSlFacebookBackground heateorSlFacebookLogin" alt="Login with Facebook" title="Login with Facebook" onclick="heateorSlCommentFormLogin = true;heateorSlInitiateLogin( this, 'facebook' )" ><div class="heateorSlFacebookLogoContainer"><ss style="display:block" class="heateorSlLoginSvg heateorSlFacebookLoginSvg"></ss></div></i></li><li><i class="heateorSlLogin heateorSlXBackground heateorSlXLogin" alt="Login with X" title="Login with X" onclick="heateorSlCommentFormLogin = true;heateorSlInitiateLogin( this, 'x' )" ><ss style="display:block" class="heateorSlLoginSvg heateorSlXLoginSvg"></ss></i></li><li><i class="heateorSlLogin heateorSlLinkedinBackground heateorSlLinkedinLogin" alt="Login with Linkedin" title="Login with Linkedin" onclick="heateorSlCommentFormLogin = true;heateorSlInitiateLogin( this, 'linkedin' )" ><ss style="display:block" class="heateorSlLoginSvg heateorSlLinkedinLoginSvg"></ss></i></li><li><i id="heateorSlGoogleButton" class="heateorSlLogin heateorSlGoogleBackground heateorSlGoogleLogin" alt="Login with Google" title="Login with Google" onclick="heateorSlCommentFormLogin = true;heateorSlInitiateLogin( this, 'google' )" ><ss style="display:block" class="heateorSlLoginSvg heateorSlGoogleLoginSvg"></ss></i></li><li><i class="heateorSlLogin heateorSlGithubBackground heateorSlGithubLogin" alt="Login with Github" title="Login with Github" onclick="heateorSlCommentFormLogin = true;heateorSlInitiateLogin( this, 'github' )" ><ss style="display:block" class="heateorSlLoginSvg heateorSlGithubLoginSvg"></ss></i></li></ul></div></div><div style="clear:both; 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