JSON Fixer

What Does the JSON Fixer Do?

The JSON Fixer tool automatically detects and repairs common syntax errors in JSON data. It's perfect for fixing JSON that has been manually edited, copy-pasted from a document, or exported from another application and contains small mistakes.

Common Errors Fixed

• Trailing Commas - Removes commas after the last element in arrays and objects
• Single Quotes - Converts single quotes to double quotes
• Unquoted Keys - Adds quotes to object property names
• JavaScript-Style Comments - Removes // and /* */ comments
• Python Booleans - Converts True/False/None to true/false/null

How to Use

1. Paste your broken JSON into the input field
2. The tool automatically attempts to fix the JSON
3. Review the fixes applied and the corrected output
4. Copy the fixed JSON to your clipboard

Limitations

While our JSON Fixer can repair many common errors, some severely malformed JSON may not be fixable automatically. In these cases, you may need to manually review and correct the data structure.

Already have valid JSON? Use our JSON Formatter to beautify it with proper indentation.

FAQ

What kinds of JSON errors can the fixer repair?

The JSON Fixer handles trailing commas, single quotes, unquoted keys, JavaScript-style comments (// … and /* … */), and Python-style booleans like True, False, and None.

What if my JSON is too broken to fix automatically?

The fixer handles the most common syntax mistakes, but severely malformed JSON may require manual editing. The formatter will highlight remaining errors so you can find and fix them quickly.

Is my data safe?

Yes. All repair logic runs entirely in your browser. Your JSON is never sent to any server.

What is the difference between the Fixer and the Formatter?

The Fixer repairs syntax errors to make invalid JSON valid. The Formatter takes already-valid JSON and adds indentation and line breaks to make it readable. Use the Fixer first if your JSON has errors, then the Formatter to beautify it.