Reading Minified Code

In production, your code is minified into unreadable gibberish like a=b=>c+d. When an error occurs in this file, how do you find where it came from? Source Maps solve this.

How Source Maps Work

A .map file tells the browser: " Line 1, character 500 in the minified file is actually line 42 in your original UserService.js file. "

Bundlers (Vite, Webpack) generate them automatically:

// vite.config.js
export default {
  build: {
    sourcemap: true // Generate source maps for production
  }
}

With source maps enabled, Chrome DevTools shows errors in your original readable source code — even though the minified file is actually being executed.

Source Map Files

dist/
  main.js         ← minified code (what runs in the browser)
  main.js.map     ← source map (maps minified → original)
src/
  UserService.js  ← your original code (stays on your server)