JSON Repair
Automatically fix broken JSON — trailing commas, single quotes, unquoted keys.
Broken JSON
Repaired output
Paste broken JSON on the left to repair it.
What is JSON Repair?
A JSON repair tool automatically fixes the malformed JSON that shows up constantly in the real world — a trailing comma left after deleting the last property, single quotes instead of double quotes, unquoted object keys, missing commas between array items, or even JavaScript-style comments left in from a config file — and turns it into standards-compliant, parseable JSON. Unlike a strict formatter (which only re-indents input that already parses), a repair tool tolerates the common mistakes people and legacy systems actually produce, applies the minimal set of corrections needed to make the document valid, and hands back clean, pretty-printed output. It's the difference between a tool that tells you "line 4, unexpected token" and one that just fixes line 4 for you.
How to use JSON Repair
- Paste or type the broken JSON into the left panel — or drag a .json file onto it.
- The repaired, pretty-printed result appears automatically on the right.
- A badge above the output tells you whether anything was actually repaired, or if your input was already valid JSON.
- Copy the repaired JSON with the copy button once you're happy with the result.
Examples
Trailing comma + unquoted keys
Input
{name: 'Ada', active: true,}
Output
{ "name": "Ada", "active": true }
Missing comma between array items
Input
["a" "b" "c"]
Output
[ "a", "b", "c" ]
Common mistakes
- Assuming a repair tool can fix any input — severely truncated or ambiguously nested JSON still can't be recovered safely.
- Not noticing the 'already valid' badge and assuming your input must have had an error just because you ran it through a repair tool.
- Using this instead of the JSON Formatter's validator when you actually want to know the exact line/column of a syntax error, not have it silently fixed.
Why use this tool
- Runs entirely client-side — broken JSON containing tokens, config values, or other sensitive data never leaves your browser.
- Fixes the syntax mistakes people actually make (trailing commas, single quotes, unquoted keys) instead of just reporting them.
- Faster than manually hunting for a missing comma or mismatched bracket in a large document.