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Automatically create package.json file

$ npm init

{
    "name": "myapp",
    "version": "1.0.0",
    "description": "My first App",
    "author": "Ivan Milincic",
    "licence": "MIT"
}

Install npm package and save it to package.json (--save)

$ sudo npm install --save grunt-saas

Result:

{
    "name": "myapp",
    "version": "1.0.0",
    "description": "My first App",
    "author": "Ivan Milincic",
    "licence": "MIT",
    "dependencies": {
        "grunt-sass": "^1.0.0"
    }
}

^1.0.0 = latest stable version.
* = latest version, dev or beta any...

Install everything from package.json

$ npm Install

List all installed packages in this folder

$ npm list

List all globally installed packages

$ npm -g list

Packages npm thinks that should be outdated

$ npm outdated

Update packages

$ npm update

Uninstall package (use --save to remove it from the package.json also)

$ npm uninstall --save grunt-sass

Remove unnecessary files (clean junk)

$ npm prune