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    <p>Note that the NodeJS module mechanism is based on <a href="http://en.wikipedia.org/wiki/CommonJS" rel="noreferrer"><strong>CommonJS</strong></a> modules which are supported in many other implementations like <strong>RequireJS</strong>, but also <strong>SproutCore</strong>, <strong>CouchDB</strong>, <strong>Wakanda</strong>, <strong>OrientDB</strong>, <strong>ArangoDB</strong>, <strong>RingoJS</strong>, <strong>TeaJS</strong>, <strong>SilkJS</strong>, <strong>curl.js</strong>, or even <strong>Adobe Photoshop</strong> (via <a href="https://github.com/theiviaxx/PSLib" rel="noreferrer">PSLib</a>). You can find the full list of known implementations <a href="https://web.archive.org/web/20140803042801/http://www.commonjs.org/impl/" rel="noreferrer">here</a>.</p> <p>Unless your module use node specific features or module, I highly encourage you then using <code>exports</code> instead of <code>module.exports</code> <strong>which is not part of the CommonJS standard</strong>, and then mostly not supported by other implementations.</p> <p>Another NodeJS specific feature is when you assign a reference to a new object to <code>exports</code> instead of just adding properties and methods to it like in the last example provided by Jed Watson in this thread. I would personally discourage this practice as this <strong>breaks the circular reference support</strong> of the CommonJS modules mechanism. It is then not supported by all implementations and Jed example should then be written this way (or a similar one) to provide a more universal module:</p> <p>(sayhello.js):</p> <pre><code>exports.run = function() { console.log("Hello World!"); } </code></pre> <p>(app.js):</p> <pre><code>var sayHello = require('./sayhello'); sayHello.run(); // "Hello World!" </code></pre> <p>Or using ES6 features</p> <p>(sayhello.js):</p> <pre><code>Object.assign(exports, { // Put all your public API here sayhello() { console.log("Hello World!"); } }); </code></pre> <p>(app.js):</p> <pre><code>const { sayHello } = require('./sayhello'); sayHello(); // "Hello World!" </code></pre> <p>PS: It looks like Appcelerator also implements CommonJS modules, but without the circular reference support (see: <a href="https://stackoverflow.com/questions/10859630/appcelerator-and-commonjs-modules-caching-and-circular-references">Appcelerator and CommonJS modules (caching and circular references)</a>)</p>
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    1. POWhat is the purpose of Node.js module.exports and how do you use it?
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