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Showing content from https://docs.npmjs.com/using-npm-packages-in-your-projects below:

Using npm packages in your projects

Once you have installed a package in node_modules, you can use it in your code.

If you are creating a Node.js module, you can use a package in your module by passing it as an argument to the require function.

var lodash = require('lodash');
var output = lodash.without([1, 2, 3], 1);
console.log(output);

In package.json, list the package under dependencies. You can optionally include a semantic version.

{
  "dependencies": {
    "package_name": "^1.0.0"
  }
}

To use a scoped package, simply include the scope wherever you use the package name.

var projectName = require("@scope/package-name")

In package.json:

{
  "dependencies": {
    "@scope/package_name": "^1.0.0"
  }
}

If you have not properly installed a package, you will receive an error when you try to use it in your code. For example, if you reference the lodash package without installing it, you would see the following error:

module.js:340
    throw err;
          ^
Error: Cannot find module 'lodash'

• For scoped packages, run npm install <@scope/package_name>
• For unscoped packages, run npm install <package_name>

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