Installing Current And Previous Packages Via NPM

When coming from Java/CFML to Node.js one of the first tools you come across is the package manager. This allows you to download/add packages globally to your environment or locally to your project (locally is the default way).

How to locally install a package

If you had a single project that used Coffee Script you should change your current directory to your application root directory and run $ npm install coffee-script. This will grab you the latest copy, create a node_modules directory, only if it doesn’t already exist, and install the coffe-script module within it.

How to globally install a package

You might want to use coffee-script for all your projects. At which point you add the -g flag, so your command becomes $ npm install -g coffee-script. This will put the package in /usr/local/lib/node_modules.

Installing a previous version

When you start development you could be using version 1.82 of a package but in a couple of months when you bring on another developer they could be on v2.01 which breaks your app. To get around this you can choose which version of a specific module to install by using $ npm install [package name]@[version]. So your new developer would use $ npm install [package name]@1.82.

If the v1 branch is still maintained for bugs etc you can change your call using a wild card to get the latest version by using any of the following
$ npm install [package name]@1.x $ npm install [package name]@1.8x $ npm install [package name]@<2.0

You can take this further (though I haven't found a need for this yet) by defining the versions like this:
`$ npm install [package name]@">=1.82 <2.0"

Updating or uninstalling a package

As easy as it is to install you can update or uninstall a package either locally or globally
$ npm update -g [package name] $ npm update [package name] $ npm uninstall -g [package name] $ npm uninstall [package name]

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