Once installed to your node_modules folder, you’ll be able to use require() on them just like they were built-ins.
Thankfully, npm is very simple to use: you only have to run npm install async, and the specified module will be installed in the current directory under. You come across a problem, and you decide that it’s time to use that cool library you keep hearing about – let’s use Caolan McMahon’s async as an example. Let’s say you’re hard at work one day, developing the Next Great Application. Once you have a package you want to install, it can be installed with a single command-line command. These applications can be searched for on. A plethora of node.js libraries and applications are published on npm, and many more are added every day. Npm, short for Node Package Manager, is two things: first and foremost, it is an online repository for the publishing of open-source Node.js projects second, it is a command-line utility for interacting with said repository that aids in package installation, version management, and dependency management.
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