JSON Validator & Repair

JSON validation is the process of checking whether a JSON string conforms to the JSON specification. A valid JSON document must follow strict syntax rules: keys must be double-quoted, strings must use double quotes, trailing commas are not allowed, and brackets must be properly balanced.

This tool goes beyond basic validation by also offering automatic repair of common JSON issues. If your JSON has missing quotes, trailing commas, single quotes, or other problems, the repair engine can fix them automatically.

Common issues that can be fixed:

• Missing quotes around keys and string values
• Trailing or missing commas
• Single quotes instead of double quotes
• Missing escape characters in strings
• Unbalanced brackets and braces
• Truncated JSON (incomplete documents)
• Comments (JSONC format)

1. Paste your JSON — Copy and paste any JSON data (valid or corrupted) into the input textarea. You can also click Corrupted Example to load a sample.
2. Validate — Click Validate to check for syntax errors. The tool reports the exact line number and column position of each issue.
3. Repair — Click Repair to automatically fix common JSON issues. The repaired JSON appears in the output area.
4. Format — Click Format to beautify the input JSON with proper indentation.
5. Copy or download — Use the copy button on the output area or click Download .json to save the result as a file.