Format JavaScript Code Online

JavaScript Code Formatter & Beautifier

⚡ JavaScript Code Formatter

Instantly beautify and format your JavaScript with our free online JS Formatter tool. Make your code readable, fix messy or minified scripts, and spot errors quickly—perfect for developers, learners, and anyone working with JavaScript.

📝 Paste or type your JavaScript here:
Minified or messy? Paste any JS, even obfuscated code!
✅ Formatted Output:
Use the output as-is, or further edit for your project.
🔒 Your JavaScript is processed 100% in your browser. No code leaves your device. Fast, private, and secure.

Why Format JavaScript? Make Your Code Readable & Reliable

JavaScript is the backbone of modern web development, powering everything from simple interactions to advanced web applications. Yet, messy or minified code can make troubleshooting, collaboration, and maintenance a nightmare. Formatting JavaScript code online transforms unreadable scripts into structured, indented code—making it easier to spot bugs, understand logic, and share with others.

Whether you’re cleaning up code from a third-party library, fixing an obfuscated snippet, or just want your functions to look professional, this free JavaScript code beautifier is your go-to tool.

Before & After: Fixing Messy JavaScript

Before (Messy JS)

function sum(a,b){return a+b}var x=1;if(x>0){console.log(‘ok’);}for(var i=0;i<3;i++){x+=i}

After (Formatted JS)

function sum(a, b) { return a + b; } var x = 1; if (x > 0) { console.log(‘ok’); } for (var i = 0; i < 3; i++) { x += i; }

Common Formatting Issues Fixed by Our Tool

  • Uneven or missing indentation
  • Long lines without breaks
  • Missing or inconsistent semicolons
  • Obfuscated/minified code all on one line
  • Hard-to-understand variable scope and control flow
  • Redundant or misplaced whitespace

Best Practices for Formatting JavaScript

  • Indentation: Use 2 or 4 spaces per level; be consistent.
  • Curly Braces: Place opening braces on the same line as function/if/for statements.
  • Variable Naming: Use camelCase for variables and functions.
  • Whitespace: Keep a single blank line between functions; avoid unnecessary spaces.
  • Semicolons: Always end statements with semicolons for clarity.
  • Commenting: Use clear, concise comments above complex logic.

Tip: Well-formatted code isn’t just easier to read—it prevents bugs and accelerates teamwork.

Debugging Made Easier with Formatted Code

Debugging is far simpler when your code is structured. By revealing nesting, function boundaries, and logical flow, formatting helps you spot misplaced brackets, missing semicolons, or unreachable code. It’s a crucial first step before using browser dev tools or linting utilities.

Advanced Usage: Beyond Online Formatting

  • Integrate formatting in your editor (VS Code, Sublime, Atom) for automatic beautification.
  • Use formatters in build pipelines (e.g., Prettier, ESLint) for code consistency.
  • Format code before sharing in documentation or code review platforms.
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