JSON Validator
Validate JSON and pinpoint syntax errors by line and column. Free, private, and 100% client-side.
Local only
Recent history
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How to use
- Paste JSON into the input box.
- Read the validation result.
- Fix the reported line and column if invalid.
Frequently asked questions
- How are syntax errors reported?
- The tool shows the line and column of the first syntax error so you can fix it quickly.
- Does validation modify my data?
- No. Validation only checks structure and never alters your input.