JSON Repair Tool
Paste JSON with common errors (single quotes, unquoted keys, trailing commas, comments) and automatically repair it into valid JSON.
What it fixes automatically
All fixes are mechanical, syntax-only changes — the value of a piece of data is never reinterpreted or changed, and the content of a string is never touched even if it looks like JSON syntax.
| Problem | How it's fixed |
|---|---|
| Single quotes | Converted to double quotes |
| Unquoted keys | Quoted |
| Trailing commas | The final comma in objects and arrays is removed |
| // and /* */ comments | Removed (JSON doesn't allow them) |
What it doesn't fix
If the JSON has an unclosed brace or bracket, text that isn't JSON at all, or any other structural error that isn't a simple syntax issue, the tool doesn't invent a fix: it shows the real error instead of forcing a result.
Privacy
The JSON is processed in your browser. It's never sent to Numelto or to any external service.