Format & Validate JSON
Format, validate, and beautify JSON data with our free tool. Paste minified or messy JSON and get perfectly indented output. Quickly spot errors with line-by-line validation. No data sent to servers – processing happens locally.
How to Use This Calculator
- Paste your JSON data
- Click Format to beautify
- Or Minify to compress
- Copy the result
Features
- JSON validation
- Pretty print with indentation
- Minify option
- Error reporting with line numbers
- Syntax highlighting
Frequently Asked Questions
Is my data secure?
Yes, all processing happens in your browser. Your JSON data is never sent to our servers.
What causes JSON validation errors?
Common errors include missing commas, unquoted keys, trailing commas, and mismatched brackets or braces.