JSON Formatter
Beautify, minify, and validate your JSON data instantly. Features syntax highlighting, tree view, collapse/expand, and error detection with line numbers.
100% Privacy
Files stay strictly on your device. Zero server uploads.
Instant Speed
Local browser WebAssembly & JS processing engine.
Free Forever
Unlimited usage with no hidden fees or watermarks.
How to Format JSON
Input JSON
Paste JSON data or upload a JSON file.
Format
Click Beautify to format or Minify to compress.
Validate
Errors are highlighted with line numbers.
Copy or Download
Copy the formatted JSON or download as a file.
Frequently Asked Questions
Standard JSON as defined by RFC 8259.
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