Tutorial: Creating Node.js modules

Node.js Modules

In this short tutorial I’m going to explain how you can create your own modules in Node.js, as everyone knows we cannot keep our entire code in only one js file, as your application grows it’ll be almost impossible for you to maintain your code, for this reason it’s essential that we separate our code in modules, this way it’ll hopefully always be organized and easy to maintain.

Node.js makes it very easy for us to create custom modules, let’s suppose we need to put 2 functions in a separated module, we just need to create a new js file like this:


exports.function1 = function(){
	console.log('Function 1');
exports.function2 = function(){
	console.log('Function 2');

As you can see it’s a very straightforward code, all I did was to create 2 functions and add them to module.exports, unless you don’t want your functions to be visible to other modules it’s very important that you add them to exports.

Now you can require this new module in another module as follows:


var newModule = require('./newModule');

When requiring a module you have to pass its full path to the require function, in this example I’m assuming that the 2 js files are in the same folder. After requiring your module you’re done! Now this app.js file has access to all the functions you’ve exported from your new module.

Recommended for you

How to Load a JSON file in Javascript In this post I'm going to give you a very simple example of how to read a JSON file and display the data on the page. I'll be using jQuery in this example, so if you don't have it on your project don't forget to add the script. So let's get started, first we need a JSON, you probably already have...
Node.js Tutorial: Reading and Writing files Reading and writing files is a very trivial task, no matter what programming language you use you probably have already came across a situation where you had to do it, and it's not different for node.js developers, luckily node.js makes this task very easy for us, with the file system(fs) module we ...
How to Execute a .jar File with Node.js Child Processes You probably have already come across situations where your application had to execute other applications or native commands from the OS. Node.js can easily do that by spawning child processes. To show you how to do that I'm going to give you an example of how to execute a .jar file with node. Fi...
How to use ES6 (Very Simple Example) Compiling Javascript ES6 Code with Babel This will be a very simple tutorial on how to use, the new and far more sophisticated version of Javascript, the ES6 (or ES2015 if you prefer). Much people say ES6 is the future of Javascript, but as everybody knows, our browsers cannot run code in this f...

Leave a Reply

Your email address will not be published. Required fields are marked *

Obs: Use the tag <pre lang="LANGUAGE"> to include code blocks to your comment.
Example: <pre lang="javascript"> console.log('Test'); </pre>