Command Line JavaScript: Node.js

NodeJS is a JavaScript runtime environment that allows JavaScript code to run outside of a browser using Google V8 JavaScript engine. NodeJS is used for writting fast executing code on the server to handle events and non-blocking I/O efficiently.

• REPL (Read-Eval-Print-Loop) to quickly write and test JavaScript code.

• The V8 JavaScript interpreter.

• Modules for doing OS tasks like file I/O, HTTP, etc.

While NodeJS was initially intended for writing server code in JavaScript, today it is widely used by JavaScript tools, which makes it relevant to front-end programmers too. A lot of the tools you'll be using in this course leverage NodeJS.