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 Cases
- ◆API response validation
- ◆Config file checking
- ◆Data format verification
- ◆Dev debugging
How to Use
- 1Paste JSON data
- 2See validation results instantly
- 3If errors, check line numbers and suggestions
- 4Fix and re-validate
Features
- ✓Real-time validation
- ✓Precise error location
- ✓Fix suggestions
- ✓Free
FAQ
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.
What errors can it detect?
Syntax errors (missing commas, brackets), invalid characters, trailing commas, single quotes instead of double quotes, and unescaped control characters.
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.