How to install npm
When you install nodejs you will get npm along with it
https://nodejs.org/en/download/
To check node and npm version
node -v
npm -v
NPM stands for Node Package Manager
- it is a package manager for Javascript
The uses of npm are
- It is an online repository for the publishing of open-source Node.js projects
FOR EXAMPLE:
if you want to import the testing framework you can just install it by
npm install --save-dev jest
- It is a command-line utility for package installation, version management, and dependency management.
FOR EXAMPLE:
if you have module @jest/core, you can update to the latest version by
npm install @jest/core@latest
Once you install the library, it will store in node_modules
Normally, node_modules gonna be a big folder, so you do not push it into git.
It is recommended to have package.json and package-lock.json, to help you know those libraries and their versions
To create a package.json file
npm init
Package.json - list the version of its dependencies (library we install), and also other project information such as name, version, author, script, etc.
Package-lock.json - list solely about the dependencies in depth
Now when you want to install those libraries, npm can get the info from package-lock.json
To install dependencies just run:
npm install
Also keep in mind that:
- You can have only
package.json - But you can not have only
package-lock.jsonfile
package-lock.json have to come with package.json
** And both files need to be stored in git
Reference:
https://nodejs.org/en/knowledge/getting-started/npm/what-is-npm/
https://stackoverflow.com/questions/45052520/do-i-need-both-package-lock-json-and-package-json#:~:text=No.-,The%20package.,to%20a%20specific%20version%20number.
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