Free JSON Formatter & Validator — Clean and Beautify JSON Online

Clean up your messy JSON data instantly. This free online JSON formatter helps you beautify, minify, and validate JSON code directly in your browser. Like all our tools, it runs locally for maximum privacy and speed.

Why use this JSON Formatter?

JSON (JavaScript Object Notation) is the standard for data exchange, but it often arrives as a single, unreadable line. This tool makes it human-readable.

• 100% Private: Your data never leaves your browser. No server-side processing.
• Instant Validation: Find syntax errors (like missing commas or quotes) in real-time.
• Beautify & Minify: Toggle between readable "pretty-print" and compact "minified" versions.
• One-Click Copy: Quickly copy the result back to your clipboard.
• Dark Mode Support: Easy on the eyes for late-night debugging.

How to use it

1. Paste your JSON: Type or paste your raw JSON string into the input area.
2. Beautify: Click "Beautify" to add indentation and spacing.
3. Minify: Click "Minify" to remove all whitespace for the smallest possible file size.
4. Fix Errors: If your JSON is invalid, the tool will highlight the error message so you can fix it.

Common use cases

Debugging APIs Quickly format raw API responses to understand the data structure.

Configuration Files Beautify package.json, settings.json, or other config files before committing them to Git.

Saving Space Minify large JSON files before production deployment to reduce bandwidth.

Frequently Asked Questions

Is my data safe? Absolutely. We do not transmit your JSON to any server. Everything happens within your browser's memory.

Can it handle large files? Yes, it can handle large JSON strings efficiently using native browser performance.

What happens if my JSON is invalid? The tool will display a "JSON Error" alert with a specific message explaining what went wrong and where.