Repair copied payloads
Clean JSON copied from logs, chat transcripts, or documentation where formatting often gets damaged.
JSON Repair Tool Online
Fix malformed JSON in the browser before it breaks your parser, API request, or LLM workflow. Use this page when you need to clean trailing commas, single quotes, unquoted keys, or other formatting issues quickly without sending your data to a server.
JSON Repair Tool
Powered by jsonrepair
Malformed JSON Input
Repaired JSON Output
Useful for trailing commas, single quotes, unquoted keys, broken escapes, and other common JSON formatting mistakes.
JSON repair use cases
Prepare API requests
Fix invalid request bodies before they hit your backend or schema validator.
Clean data for AI workflows
Repair broken JSON first, then convert it to TOON or TONL when you want lower token overhead.
JSON repair FAQ
What can a JSON repair tool fix?
A JSON repair tool can fix common issues such as trailing commas, single-quoted strings, unquoted keys, broken escape sequences, and other small formatting mistakes that stop standard JSON parsers from working.
Does this JSON repair tool upload my data?
No. The repair tool runs in the browser, so your malformed JSON stays on your device while you clean it up.
What should I do after repairing JSON?
After repairing JSON, you can validate it against a schema, inspect it with other JSON tools, or convert it to TOON or TONL for LLM workflows.