Node.js: Cannot find module 'chai'

Question

I am trying to follow a first example from https://mochajs.org/

Done this

$ npm install -g mocha 

Got

C:\Windows\system32>npm install -g mocha npm WARN deprecated [email protected]: Jade has been renamed to pug, please install th e latest version of pug instead of jade npm WARN deprecated [email protected]: graceful-fs version 3 and before will fai l on newer node releases. Please update to graceful-fs@^4.0.0 as soon as possibl e. C:\Users\TestUser\AppData\Roaming\npm\_mocha -> C:\Users\TestUser\AppData\Roamin g\npm\node_modules\mocha\bin\_mocha C:\Users\TestUser\AppData\Roaming\npm\mocha -> C:\Users\TestUser\AppData\Roaming \npm\node_modules\mocha\bin\mocha [email protected] C:\Users\TestUser\AppData\Roaming\npm\node_modules\mocha ├── [email protected] ├── [email protected] ├── [email protected] ├── [email protected] ├── [email protected] ├── [email protected] ([email protected]) ├── [email protected] ([email protected]) ├── [email protected] ([email protected], [email protected]) └── [email protected] ([email protected], [email protected], [email protected]) 

Also installed chai (sorry, I originally forgot to mention it)

C:\Windows\system32>npm install -g chai [email protected] C:\Users\TestUser\AppData\Roaming\npm\node_modules\chai ├── [email protected] ├── [email protected] └── [email protected] ([email protected]) 

And here is the code

var assert = require('chai').assert; describe('Array', function() {   describe('#indexOf()', function () {     it('should return -1 when the value is not present', function () {       assert.equal(-1, [1,2,3].indexOf(5));       assert.equal(-1, [1,2,3].indexOf(0));     });   }); }); 

Keep getting

Error: Cannot find module 'chai' at Function.Module._resolveFilename (module.js:325:15) at Function.Module._load (module.js:276:25) at Module.require (module.js:353:17) at require (internal/module.js:12:17) at Object.<anonymous> (c:\git\develop\SendText\test\test2.js:1:76) at Module._compile (module.js:409:26) at Object.Module._extensions..js (module.js:416:10) at Module.load (module.js:343:32) at Function.Module._load (module.js:300:12) at Function.Module.runMain (module.js:441:10) 

What am I doing wrong?

Answer 1

You have installed chai globally (with -g option), that's why require don't find it.

You need to install it locally (on your node_modules directory), so that require can find it.

To do so, type:

npm install --save-dev chai 

Answer 2

You need to install chai locally to require it.

npm install chai