Fix JSON
Automatically repair broken or non-standard JSON data
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About Fix JSON
Fix JSON is a smart repair tool that automatically detects and fixes common issues in broken or non-standard JSON data. It handles single quotes, trailing commas, comments, Python dict syntax (True/False/None), Java Map.toString() output, JSON5 features, and even extracts JSON embedded in log text.
Simply paste any broken JSON-like data and the tool will detect the format, apply the necessary fixes, and output valid standard JSON. All processing happens locally in your browser — your data never leaves your device.
Frequently Asked Questions
What types of broken JSON can this tool fix?▼
It can fix single-quoted strings, trailing commas, JavaScript/C-style comments, Python dict syntax (True/False/None, single quotes), Java Map.toString() format, JSON5 features (unquoted keys, hex numbers), and extract JSON from surrounding log text.
Is my data safe when using this tool?▼
Absolutely. All processing happens entirely in your browser using JavaScript. Your data never leaves your device and is never sent to any server.
How does it detect the input format?▼
The tool analyzes the input text for characteristic patterns — such as Python keywords (True/False/None), Java Map syntax ({key=value}), comments (// or /* */), and single quotes — then applies the appropriate transformations.