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    <p>If, despite all the other answers, you still want to traditionally <em>include</em> a file in a node.js source file, you can use this:</p> <pre><code>var fs = require('fs'); // file is included here: eval(fs.readFileSync('tools.js')+''); </code></pre> <ul> <li>The empty string concatenation <code>+''</code> is necessary to get the file content as a string and not an object (you can also use <code>.toString()</code> if you prefer).</li> <li>The eval() can't be used inside a function and <em>must</em> be called inside the global scope otherwise no functions or variables will be accessible (i.e. you can't create a <code>include()</code> utility function or something like that).</li> </ul> <p>Please note that in most cases this is <em>bad practice</em> and you should instead <a href="http://nodejs.org/docs/latest/api/modules.html" rel="noreferrer">write a module</a>. However, there are rare situations, where pollution of your local context/namespace is what you really want.</p> <h3>Update 2015-08-06</h3> <p>Please also note this won't work with <code>"use strict";</code> (when you are in <a href="https://stackoverflow.com/q/8651415/688869">"strict mode"</a>) because functions and variables <em>defined</em> in the "imported" file <a href="https://whereswalden.com/2011/01/10/new-es5-strict-mode-support-new-vars-created-by-strict-mode-eval-code-are-local-to-that-code-only/" rel="noreferrer">can't be accessed</a> by the code that does the import. Strict mode enforces some rules defined by newer versions of the language standard. This may be another reason to <em>avoid</em> the solution described here.</p>
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    1. POIn Node.js, how do I "include" functions from my other files?
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    1. COCool, this is useful for quick'n'dirty putting JS libs designed for client-side into a node.js app without the need of maintaining a Node-styled fork.
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    2. COThe "+''" is just a shortcut to force string casting. The more readable solution would be "String(fs.readFileSync('tools.js'))" or if the read.FileSync returns an object then "fs.readFileSync('tools.js').toString()" should also work since toString is attached to the base Object prototype (i.e Object.prototype.toString).
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    3. COBlindly importing JS into the global namespace can open the code to unintended naming conflicts. If the code in the tools.js file were written in object literal format you could assign them to a local variable which works like a pseudo-namespace. Also, I don't really think the eval is required (masylum's code makes it seem like the code is already eval'd during the require). I think you're import/eval-ing the code with require, casting that code back to string and eval-ing it again just to pidgeonhole it into the global namespace. Looks like you're doing it wrong.
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