Using an Installed Package

Once the package is in node_modules, you can use it in your code. For example, if you are creating a Node.js module, you can require it.

Example:

Create a file named index.js, with the following code:

// index.js
var lodash = require('lodash');

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

Run the code using node index.js. It should output [2, 3].

If you had not properly installed lodash, you would receive this error:

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

To fix this, run npm install lodash in the same directory as your index.js.