JSON Formatter
JSON Formatter handles one task — format and validate json — without an account or a download. Parsing, formatting and validation all run in your browser, so API keys, tokens and internal payloads are never transmitted. It is used most by DevOps staff reading config and log data quickly. Handles large payloads — several megabytes of JSON is fine. It stays free with unlimited use, and there is no watermark on anything it produces.
Key features
- Handles large payloads — several megabytes of JSON is fine.
- Reports the line and position of a syntax error instead of failing silently.
- Works on desktop, tablet and phone — no separate app to install.
- Loads in under a second and gives its result in one action.
How to use JSON Formatter
- Paste your input: Drop the payload, code or value into the box above.
- Run it: Press the action button — errors are reported with their position.
- Take the output: Copy the result, or download it when the output is a file.
Frequently asked questions
- What happens with invalid input? — You get the position of the problem rather than a blank failure, so it is usable as a validator.
- Is it safe to paste production data into JSON Formatter? — Yes. JSON Formatter runs entirely in your browser — no request is made, nothing is logged, and nothing persists after you close the tab.
- Does it follow the official spec? — Yes — the published specification, not a simplified version, so results match your language's own parser.
- How large an input can it take? — Several megabytes is routine. The limit is your browser's memory, not a server quota.