JSON Validator
Validate JSON instantly: a clear valid/invalid verdict with the exact line, column and error message. Your input is never modified.
JSON Validator
Check whether JSON is valid and see the exact line and column of any error.
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How to use
The whole flow runs in your browser — nothing is uploaded.
- Paste your JSONThe editor accepts any JSON text, formatted or minified.
- Read the verdictA green panel confirms valid JSON; a red panel names the problem.
- Fix the errorThe reported line and column point at the exact character to change.
- Keep workingYour input is never altered by validation.
- Every step runs locally in your browser.
Key Features
Check whether JSON is valid and locate the exact error. Everything runs client-side on your own device.
- Input never modifiedValidation is read-only — the text you pasted is exactly what stays.
- Live checkingThe verdict updates as you type, with a short debounce for large inputs.
- Exact error locationLine and column numbers for the first character that breaks parsing.
- Structure summaryWhen valid, see the root type, key count and depth of your document.
Frequently asked questions
No — standard JSON does not allow comments. Strict JSON.parse rules are applied.
No. This tool only reports validity and structure; use the JSON Formatter when you want pretty-printed output.
Never. Validation runs in your browser.