Free Online JSON Formatter & Validator
Format, validate & minify JSON
Formatted JSON will appear here...
About JSON Formatter
Format, validate, and minify JSON data instantly. Syntax highlighting, error detection with line numbers, and tree view make it easy to work with complex JSON. Runs entirely in your browser.
How to Use JSON Formatter
- 1
Paste your JSON
Enter or paste raw JSON into the editor.
- 2
Format or minify
Click Format to pretty-print or Minify to compress.
- 3
Fix errors
Validation errors are highlighted with line numbers so you can fix issues quickly.
Frequently Asked Questions
Is my data safe?
Yes. All processing happens entirely in your browser. Your data never leaves your device and is never uploaded to any server.
Can it handle large JSON files?
Yes. The formatter processes JSON of any size directly in your browser. Very large files may take a moment depending on your device.
Does it support JSON with comments?
Standard JSON does not allow comments. The validator will flag them as errors, but you can still format the valid portions.