JSON Validator
Paste JSON and validate its syntax with clear success or parsing error feedback.
Privacy first
- Your files never leave your device
- Processing happens locally in your browser
- No upload to our servers
- No registration required
JSON Validator
Validate JSON syntax locally in your browser.
About this tool
Validate JSON syntax online with a fast client-side JSON validator and readable parsing errors.
How it works
Paste your JSON into the validation editor.
Click Validate JSON to parse the input in your browser.
Review the success message or readable syntax error, then copy the JSON if needed.
Frequently asked questions
Does the JSON Validator upload my JSON?
No. Validation runs client-side in your browser without a backend or external API.
Can this tool fix invalid JSON automatically?
No. It validates syntax and shows readable errors so you can fix the JSON yourself.
What JSON syntax problems can it detect?
It detects standard JSON.parse errors such as missing commas, extra trailing commas, invalid strings, and malformed objects or arrays.
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