While learning node.js, install packages is a commonly operation. However, as a newbie, I might install the packages not in the right way. So taking this note to refresh my mind on the
There are two ways to install npm packages: locally or globally.
- If you want to depend on the package from your own module, using something like node.js’
require, then you want to install locally. This is the default behavior of
- If you want to use a package as a command line tool, such as gulp CLI, then install the package globally.
Got the ideas? Make it further…
npm itself and npm install globally
npm is installed automatically with node.js, but sometimes it’s get updated while node.js not releasing new versions. So be sure that you have the latest version with:
-g indicates this installation is globally on your machine.
If you want to try the next, unreleased version of npm, use this command:
Install other packages globally, just in the same way with
npm install -g <package>, eg:
npm i -g gulp-cli
npm install locally
Install packages locally will create the
node_modules directory under the current directory, eg:
npm i babel-preset-env
To confirm that
npm i worked correctly, check to see that a
node_modules directory exists and that it contains a directory for the package you just installed.
If there’s no
package.json file in the local directory, the latest version of the package is installed. If
package.json file exists, it just install the version specified in the
npm install saves any specified packages into
dependencies by default. Additionally, you can control where and how they get saved with additional flags:
--save-prod: package will appear in your
dependencies. This is the
--save-dev: package will appear in your
--save-optional: package will appear in your
--no-save: this prevents saving to
All above options will save dependencies to the
First run this command:
This will check the registry to see if any installed packages (in the same directory as the
package.json) are currently outdated.
To update the packages, just run
npm update. After this, run
npm outdated should not have any results.
To find out which global packages need to be updated, type:
npm outdated -g --depth=0
Need to update the global package, type:
npm update -g <package>
To update all global packages, run:
npm update -g .
To remove a package from your
<node_modules> directory, use:
npm uninstall <package>
To remove a package from the dependencies in
package.json, you’ll need to use the
npm uninstall --save <package>
If you installed a package as a devDependency (i.e. with
npm uninstall --save won’t remove it from
package.json, you have to use
--save-dev to uninstall it.
To uninstall a global package, just in a similar way:
npm uninstall -g <package>
Well, check more options you need at https://docs.npmjs.com/cli/install, happy coding!