The npm install (Node Package Manager) command can be used to install a NodeJS package. In this example, the cors package is installed.

npm install cors

In this example, the latest version of the dotenv package is installed.

npm install dotenv@latest

Here is how you can install a specific version of a package.

npm install express@4.17.3

The -g or --global flag can be used for a global install (all users).

npm install --global node-fetch

Or, you can add the package you want to install to package.json.

{
  "dependencies": {
    "cors": "^2.8.5",
    "dotenv": "^16.0.0",
    "express": "^4.17.3",
    "node-fetch": "^3.2.1"
  }
}

The npm install command should then install or update the packages listed in package.json.

~]$ npm install

added 64 packages, and audited 65 packages in 3s

10 packages are looking for funding
  run `npm fund` for details

found 0 vulnerabilities
npm notice
npm notice New minor version of npm available! 9.5.1 -> 9.6.4
npm notice Changelog: https://github.com/npm/cli/releases/tag/v9.6.4
npm notice Run npm install -g npm@9.6.4 to update!
npm notice