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Require module in Node.js | Nodejs

Require in node.js

The require() function allows you to include modules into your programs. You can import built-in node.js modules, community-based modules(node_modules) and local modules.

The function require() returns an object, which references the value of module.exports for a given file, when the require is invoked, a sequences of tasks are happened:

Require will look for file/directory in the following order:

  • Built-in module Node.js modules (like: fs module), show in Example-1

  • Modules in node_modules folder.

      • If the module name has a ./, / or ../, it will look for the directory in the given path. It matches the extensions: *.js, *.json and *.node.

Note : The require is a function that takes one argument called path, Node.js.

How to Use require() function

  • Importing a local Coustom module or module

const myLocalModule = require('./path/myLocalModules');

  • Importing a JSON file

const jsonData = require('./path/jsonFile.json');

  • Importing a module from Node.js built-in modules or node_modules.

const crypto = require('crypto');

 ➤ Example 1: myMod.js

const fs = require('fs');
  fs.readFile('./myfile.txt', 'utf-8', (err, data) => 
  {
    if(err)
     { throw err; }
    console.log('data: ', data);
  });

In Example-1 the path is "./myfile".

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