JavaScript Engine

A JavaScript Engine is a program that:

Reads your JS code

Converts it into machine code

Executes it

Popular JS Engines

• V8 (Chrome, Node.js)
• SpiderMonkey (Firefox)
• JavaScriptCore (Safari)

How Engine Works

Steps:

1. You write JS code
2. Engine parses code
3. Converts to machine code
4. Executes instantly