This post explains how to install node.js library or module. Two ways to do this : local install or globally install.
To do before
npm, what’s that ?
npm is the tool to install, remove, search or configure node.js packages.
In this way, a installed library can’t to be used by another project different as your own.
After module install, if you read inside your directory project, you can find a new directory called node_modules. This directory saves all installed modules used by your project only.
npm command to install node.js module :
npm install module_name
For example, socket.io library :
npm install socket.io
Globally install enables to use node.js library from all projects. It’s not needed to install node.js module for all projects : one install is enough. By this whay, all modules are installed in a specific directory that you can specify.
npm install command for globally install :
npm -g install nom_module
For example, with socket.io library :
npm -g install socket.io
You can configure a specific directory modules installation with next command :
npm config set prefix path_to_directory_modules_installation
It’s easy, no ?
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