Creating and using our own modules

In this example, we use two modules, each corresponding to a JavaScript file:

• The first module (here named test.js) will be the main file of our application, the one we execute using the node test.js command in a command window.
• The second module (here named module1.js) will be the one we want to use in our main test.js module. The module1.js module will then be enriched to show how its functionalities are accessible outside the module (and will therefore be used in the main test.js module).

Let’s go ahead and create these two modules.

Creating a module

Here is the content of the two files, module1.js and test.js:

module1.js file

console.log("module1.js is loaded");

The module currently has a simple console.log() statement. The module will then be enriched. The main module test.js is the following:

test.js file

var mod1 = require("./module1.js");  
// or require("./module1...