JSON Validator
JSON Validator.
Validate JSON syntax with precise error locations.
Your files never leave your device
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What it does
Validate JSON syntax with precise error locations.
Why use it
JSON Validator validates JSON syntax with precise error locations and a quality score when valid.
Example input
{"id":1,"name":"Alice","email":"alice@example.com"} Example output
✓ Valid JSON JSON Health Score: 95/100 (Grade A)
Health Score sample
Health Score: 82/100 (Grade B)
Issues Found:
• 14 duplicate rows
• 3 malformed dates
• 21 missing emails
• 2 inconsistent delimiters
Frequently Asked Questions
Is my data uploaded when using JSON Validator?
No. All processing runs locally in your browser. Your files never leave your device.
Do I need an account?
No account is required. All tools are free and work instantly.