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Node Package Manager (NPM)

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Node Package Manager - NPM

NPM is the Package Manager for Node.js packages/modules

Install NPM:

NPM is installed by default when you install Node.js

Benefits of NPM:

It Provides and hosts Online repositories for node.js packages/modules which can be easily downloaded and used in our projects. You can find them here: npmjs.com
It Provides the Command-line utility in order to install various Node.js packages, manage Node.js versions and dependencies of the packages.

NPM useful commands:

Check NPM Version

 npm -v

Install Packages via NPM

Installed packages goes inside node_modules folder.
In Short you can use - npm i <package_name>
You can check out npm packages - npmjs.com
In Latest version, --save is optional. it automatically save the package as a dependency in package.json

Syntax:

npm install <package_name>

Install the package globally

npm install <package_name> -g

Save the package as dependency

npm install <package_name> --save

Save the package as dev-dependency

npm install <package_name> --save-dev

Install the latest version of a package

npm install <package_name>@latest

Install any particluar version of a package

npm install <package_name>@<version_number>

//npm install express@4.11.1

Uninstalling Packages/Modules via NPM

 npm uninstall <package_name>

Update Packages/Modules via NPM

 npm update <package_name>

 //aliases: up, upgrade

List all Installed Packages

 npm ls

package.json

{
  "name": "MyNodeProject",
  "version": "1.0.0",
  "description": "My Nodejs Project",
  "main": "app.js",
  "author": {
    "name": "Dev",
    "email": "dev@xyz.com"
  },
  "dependencies": {
    "body-parser": "~1.10.2",
    "express": "~4.11.1",
    "nodemon": "^1.14.12"
  },
  "devDependencies": {
    "grunt": "^0.4.5",
    "grunt-contrib-jshint": "^0.10.0",
    "jshint-stylish": "^0.2.0",
    "time-grunt": "^0.3.2"
  }
}

Node.js Framework

Node Version Manager (NVM)