Nodejs | Tutorial
- Learn Node.js Tutorial 8
- What is Node.js?
- Features of Node.js
- Install Node.js Linux
- Install Node.js Windows
- Node.js REPL
- Node.js Framework
- Node Package Manager (NPM)
- Node Version Manager (NVM)
- Node.js Modules 3
- Node.js File System 2
- Node.js Debugger 2
- Node.js Error Handling 7
- Node.js Error Object
- Node.js Try Catch
- Error First Callback
- EventEmitter Errors
- Using Express.js Middleware
- Using Promises
- Using Async/Await
- Node Process Manager 2
Node.js Modules
- Node.js modules are useful to move the common functionalities to separate .js file to reuse it in applications based on our requirements.
- Each module has its own context, so if we create any new module that won’t interfere with other modules in application.
Type of Modules in Node Js
- Core (Built-in) Modules
- Local (Custom) Modules
- Third Party (External) Modules
Core Modules: (Built-In Modules)
Node Js Core Modules comes with it's Intallation by default. You can use them as per application requirments
Load and Use Core Module with Example:
First you need to import core module using require() function.
// import node.js built-in http module
const http = require('http');
var server = http.createServer(function(req, res){
console.log("Congrats!, Node Js is running on Port 3000");
});
server.listen(3000);
Node.js - Utility Modules
There are many utility modules available in Node.js module library which are most frequently being used in node js project.
| Module | Description |
|---|---|
| OS Module |
Provides basic operating-system related utility functions. var os = require("os")
|
| Path Module |
Provides utilities for handling and transforming file paths. var path = require("path")
|
| Net Module |
Provides both servers and clients as streams. Acts as a network wrapper. var net = require("net")
|
| DNS Module |
Provides functions to do actual DNS lookup as well as to use underlying operating system name resolution functionalities. var dns = require("dns")
|
| Domain Module |
Provides ways to handle multiple different I/O operations as a single group. var domain = require("domain")
|