Updated for 2026 • 100% Free Online Developer Tool
Free JavaScript Formatter & Beautifier
A JavaScript formatter organizes unformatted or compact JS scripts into structured, properly indented code with clean line breaks around functions, statements, and brackets.
Converted Output
100% Client-Side Code Execution
Your code and markdown never leave your browser sandbox. No server requests, no telemetry, and zero tracking.
Zero Server Logs
Benefits of Formatting JavaScript
- Improved Readability: Transform single-line obfuscated JS into structured, readable functions.
- Easy Code Review: Spot logic issues, syntax errors, and missing semicolons quickly.
- Zero Server Transmission: Runs 100% locally in your browser with zero security risk.
Verified by ConvertStuff Web Development Editorial Board
Updated August 2026How to Use Free JavaScript Formatter & Beautifier in 3 Simple Steps
1
Paste JS Code
Enter your JavaScript or JSON string into the editor.
2
Auto-Format
The tool adds clean indentation and spacing around brackets.
3
Copy Formatted JS
Copy your clean script to clipboard.
Frequently Asked Questions
Can I format JSON with this tool?
Yes! This formatter handles standard JavaScript syntax, functions, object literals, and JSON structures.