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" } }