JSON Formatter & Validator
Format, minify and validate JSON online. Beautify with indentation or compress, with clear error messages that point to the problem.
About this tool
This JSON formatter validates, beautifies and minifies JSON right in your browser. Paste any JSON payload, and choose beautified output with clean two-space indentation or compact minified JSON for storage and transmission.
When something is wrong, the validator explains it with a precise message instead of failing silently — essential when debugging API responses, configuration files and log payloads. No upload, no limits, no account needed.
FAQ
Is this JSON data kept private?
Yes. Everything runs in your browser on this page only — no data is sent to any server.
How do I format JSON?
Paste the JSON and press Beautify. The tool parses it and re-emits it with two-space indentation and sorted-free original key order.
Why does my JSON fail to validate?
Common causes: trailing commas, single quotes, unquoted keys or comments. The error message shows the exact position.