Now issue the command to install Chai globally.

Alexisca hall:

JavaScript Unit Testing > Behavior Driven Development > Getting Started with Mocha and Chai or Installing Chai Code Challenge

The correct code to use in your terminal at your Command Prompt is: $npm install --save-dev mocha chai, as per the Teacher's Notes in the above lesson. Then hit the Enter key. The -g flag installs Mocha.js & Chai.js globally. You don't need to spell out the word "globally" for it to work. Installing it this way includes both of them in your package.json file in your "development dependencies." Be sure to check your package.json file to make sure they were installed correctly.

Otherwise, (Installing Chai Code Challenge) to just install Chai.js itself, then you type: $npm install -g chai. Works the same way. Check your package.json file to make sure it was installed under your "development dependencies" in your package.json file.

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npm install -chai. works try it