Drag & drop a .json file here
or paste JSON / click Upload File above
No JSON to repair yet
1Paste broken JSON or drag a file
2Click "Repair JSON" to auto-fix errors
3Copy or download the repaired result
Paste the entire JSON block including opening and closing brackets. The repair engine handles truncation, but more context means more accurate fixes.
Check the repair report to see exactly what was changed — from trailing commas to missing braces. Every fix is listed so you can verify the output matches your intent.
Not sure if the tool handles your case? Use the "Load Example" dropdown to see how different error types — trailing commas, single quotes, unquoted keys — are repaired.
All processing happens in your browser — nothing is uploaded, stored, or tracked. Safe for proprietary logs, API keys, and sensitive config files.
Automatically repair trailing commas, single quotes, unquoted keys, missing brackets, JS-style comments, truncated JSON, and Python literals — all at once with one click.
See exactly what changed with a line-by-line repair report listing every fix applied — from missing quotes to extra commas. Know your JSON was fixed correctly.
Your broken JSON never leaves your device. No server upload, no storage, no tracking — safe for API keys, production logs, and proprietary configuration files.
Simply paste your JSON with trailing commas into the input area and click "Repair JSON." The tool automatically detects and removes any trailing commas after the last element in objects or arrays. For example, {"a":1,"b":2,} becomes {"a":1,"b":2}. This is the most common JSON syntax error you'll encounter.
The JSON specification requires double quotes for strings. If your JSON uses single quotes — common in Python dicts or JavaScript objects — paste it in and run the repair. All single-quoted strings are automatically converted to double quotes while preserving the content inside.
JSON object keys must be wrapped in double quotes. If your JSON has unquoted keys like {name: "John"}, the repair tool automatically wraps all property names in double quotes. This is a common issue when copying from JavaScript shorthand object syntax.
Standard JSON does not support comments, but many config files and LLM outputs include them. The repair tool removes both single-line (//) and multi-line (/* */) comments, returning clean, specification-compliant JSON every time.
Yes. The repair engine handles truncated JSON (missing closing brackets or braces), malformed structures, and mixed error types. It recovers valid JSON by inserting missing delimiters. For severely damaged data, review the repair report to verify accuracy.
Absolutely. LLM outputs often have trailing commas, unquoted keys, markdown code block wrappers, and mixed quote styles. Just paste the raw output including markdown fences — the repair tool strips them automatically before processing.
100% safe. All processing happens entirely in your browser. Your JSON data is never sent to any server, never stored, and never tracked. Safe for proprietary APIs, production logs, and configuration files containing secrets.
Once repaired, copy the result or download it as a .json file. If you need further editing or format conversion (CSV, Excel, Markdown), open the repaired JSON in our JSON Editor for full inline table editing and multi-format export.