JSON Formatter
Format, minify and validate JSON without sending it anywhere.
Image tools Client-side Native JSON
Tool preview
How to use it
- 01
Paste JSON.
- 02
Pick an indent or minified output.
- 03
Copy the result.
Limitations
- ! Invalid JSON returns a parse error with the failing position instead of partial output.
- ! Very large documents may freeze the tab; split them first.
FAQ
Does it preserve key order?
Yes, keys keep their original order.
Can it fix trailing commas?
No — that is invalid JSON and is reported as an error.
Is there a size limit?
Only browser memory.
Files never leave your device
Processing happens in your browser using the File API, WebAssembly and Web Workers. There is no upload endpoint.
Technical details
- Processing
- Client-side
- Implementation
- Native JSON
- Category
- Image tools
- Network requests
- None while processing