JSON Validator
Check whether JSON is valid and see exactly what's wrong if not.
JSON to validate
Result
Runs entirely in your browser — nothing here is uploaded anywhere.
How it works
- Paste your JSON into the input box.
- It's parsed immediately.
- See a valid/invalid result with details.
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Download Velox PDF for Mac — free →Frequently asked questions
What does this tool check?
Whether the text is syntactically valid JSON — matching brackets, quoted keys, no trailing commas, etc. It doesn't check against a specific schema.
Is my data uploaded?
No — validation happens entirely client-side in your browser.