Node.js For Beginners

Node.js is a javascript runtime built on Chrome's V8 javascript engine. Node.js uses an event-driven, non-blocking I/O model that makes it lightweight and efficient.

Features

Node.js provides a rich library of modules that brings many features to web applications such as HTTP request handling, file system access, networking, and much more.

Modules

Node.js has a simple module loading system. Modules are loaded using the require keyword.

var http = require('http');

The above line loads the http module into the variable http. Node.js has many built-in modules available through the require keyword.

NPM

Node Package Manager (NPM) is a package manager for Node.js modules. It is used to install, uninstall, and manage modules for use in Node.js applications. NPM is included with Node.js and can be accessed using the command line interface.

Installing Modules

[object Object] can be installed using the NPM install command.

npm install http

The above command will install the http module and any dependencies required for the module to function. The modules are installed in the node_modules folder in the current directory.

Creating Modules

Modules can be created and published to NPM for use in Node.js applications. Modules are generally created in a directory with a package.json file that contains metadata about the module.

The following is an example of a simple module named mymodule.

var mymodule = require('mymodule');

mymodule.sayHello(); // outputs "Hello!"

Modules can be published to NPM for use by the Node.js community.

Conclusion

Node.js is a javascript runtime built on Chrome's V8 javascript engine. It is used to create web applications and APIs. Node.js has a simple module loading system and many built-in modules. NPM is used to install, uninstall, and manage modules for use in Node.js applications. Modules can be created and published to NPM for use by the Node.js community.