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1 ---
2 title: Using npm packages in your projects
3 ---
4
5 Once you have [installed a package][install-pkg] in `node_modules`, you can use it in your code.
6
7 ## Using unscoped packages in your projects
8
9 ### Node.js module
10
11 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.
12
13 ```javascript
14 var lodash = require('lodash');
15
16 var output = lodash.without([1, 2, 3], 1);
17 console.log(output);
18 ```
19
20 ### package.json file
21
22 In `package.json`, list the package under dependencies. You can optionally include a [semantic version][semver].
23
24 ```json
25 {
26 "dependencies": {
27 "package_name": "^1.0.0"
28 }
29 }
30 ```
31
32 ## Using scoped packages in your projects
33
34 To use a scoped package, simply include the scope wherever you use the package name.
35
36 ### Node.js module
37
38 ```js
39 var projectName = require("@scope/package-name")
40 ```
41
42 ### package.json file
43
44 In `package.json`:
45
46 ```json
47 {
48 "dependencies": {
49 "@scope/package_name": "^1.0.0"
50 }
51 }
52 ```
53
54 ## Resolving "Cannot find module" errors
55
56 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:
57
58 ```
59 module.js:340
60 throw err;
61 ^
62 Error: Cannot find module 'lodash'
63 ```
64
65 - For scoped packages, run `npm install <@scope/package_name>`
66 - For unscoped packages, run `npm install <package_name>`
67
68 [install-pkg]: downloading-and-installing-packages
69 [semver]: about-semantic-versioning