Cannot find module 'karma' while using grunt

Make sure you have installed both karma and grunt-karma before running the grunt task:

npm install karmanpm install grunt-karma

EDIT: One liner:

npm install karma grunt-karma

angularjs npm gruntjs yeoman bower

I had to install the following

  npm install phantomjs  npm install jasmine-core  npm install karma  npm install grunt-karma

Goodluck, Rajesh

Edit: One liner:

npm install karma grunt-karma jasmine-core phantomjs

angularjs npm gruntjs yeoman bower

This work for me:

npm install phantomjs jasmine-core jasmine karma grunt-karma

Node version: 4.2.2

CodeHunter