JSON Formatter & Validator
JSON Formatter & Validator — free, fast and private. Runs entirely in your browser, no upload and no sign-up required.
Output
Paste minified or messy JSON and get a clean, indented, validated version instantly. Invalid input shows the parser's exact error message so you can find the problem.
- Inspect an API response
- Validate a configuration file before deploying
- Format JSON for documentation or code review
How it works
- 1
Choose or drop your file
- 2
Adjust options if needed and start processing
- 3
Download the result — everything stays on your device
Frequently asked questions
- Is this tool really free?
- Yes. All Convertiva tools are free to use, with no account, watermark or hidden limits beyond the per-tool file size cap.
- Are my files uploaded to a server?
- No. This tool runs entirely in your browser using WebAssembly and browser APIs. Your files never leave your device, and nothing is stored anywhere.
- What happens to my files afterwards?
- Nothing is retained. Results exist only in your browser's memory until you download them or close the page.
Processed in your browser — never uploaded.