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.


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

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

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

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

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

    throw err;
Error: Cannot find module 'lodash'

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

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