Node.js Modules (Built-in & Custom) | asadmukhtar.info

Node.js Modules (Built-in & Custom) | asadmukhtar.info

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Node.js Modules (Built-in & Custom)

Node.js uses modules to organize code into reusable pieces. There are two types of modules in Node.js:

1. Built-in Modules

Node.js provides several built-in modules that you can use in your applications without needing to install anything.

Common Built-in Modules:

http: Used to create web servers.

const http = require('http');
http.createServer((req, res) => {
  res.write('Hello, World!');
  res.end();
}).listen(3000);

fs: Allows file system operations like reading/writing files.

const fs = require('fs');
fs.readFile('example.txt', 'utf8', (err, data) => {
  if (err) throw err;
  console.log(data);
});

path: Provides utilities for working with file and directory paths.

const path = require('path');
console.log(path.join(__dirname, 'folder', 'file.txt'));

os: Provides information about the operating system.

const os = require('os');
console.log(os.platform());

2. Custom Modules

You can also create your own modules in Node.js. A custom module is simply a JavaScript file that exports functionality.

Example of Creating a Custom Module:

Create the Custom Module:
- Create a file named greet.js:

// greet.js
module.exports = function(name) {
  return `Hello, ${name}!`;
};

Use the Custom Module:

In your app.js, require and use the custom module:

// app.js
const greet = require('./greet');
console.log(greet('Node.js'));

Run the App:

node app.js

Output:

Hello, Node.js!

Conclusion

Built-in modules like http, fs, and path help handle common tasks in Node.js.
Custom modules allow you to structure your code by creating reusable functions or objects and sharing them across different files.