What is JSON Validator?
Free online JSON validator. Real-time syntax checking with precise error line and column location. Fix suggestions included — essential for API debugging.
▶Use Cases4 scenarios
- ◆API response validation
- ◆Config file checking
- ◆Data format verification
- ◆Dev debugging
▶How to Use4 steps
- 1Paste JSON data
- 2See validation results instantly
- 3If errors, check line numbers and suggestions
- 4Fix and re-validate
▶Features4 features
- ✓Real-time validation
- ✓Precise error location
- ✓Fix suggestions
- ✓Free
▶FAQ6 questions
What is the JSON Validator?
An online developer tool. Input: JSON text. Output: syntax check results with precise line and column error location plus fix suggestions. Use it when debugging API responses and config files.
How large a JSON can I validate?
Common sizes are fine; we recommend under 10MB.
What errors can it detect?
Syntax errors, mismatched quotes, missing commas, bracket mismatches, and more.
Does it validate JSON Schema?
No. This validates JSON syntax only. For schema validation (data types, required fields), use our JSON Schema Validator tool.
Can it fix errors automatically?
No auto-fix. Errors are highlighted with line numbers and descriptions so you can correct them manually.
What is the maximum JSON size?
Up to 50MB. Larger files may cause browser memory issues. For very large JSON, use command-line tools like jq.