JSON Validator & Linter Online
Verify if your JSON is syntactically valid with precise error detection.
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Input JSON205 characters
Formatted Output
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About JSON Validator
Validate your JSON payloads against the RFC 8259 JSON specification. Instantly pinpoint missing quotes, trailing commas, invalid escaping, and malformed arrays.
Key Features & Capabilities
Precise error location (line and character position)
Clear explanation of why validation failed
One-click auto-repair for common issues like single quotes and trailing commas
Fast client-side evaluation
How to Use JSON Validator
1
Paste your JSON snippet into the editor.
2
Click 'Validate JSON'.
3
Review the validation badge: Valid (Green) or Syntax Error (Red with position details).
Real-World Examples
Detecting Trailing Comma Error
Input
{"name": "Alice", "role": "admin",}Output
Error: Unexpected token '}' at line 1 column 36 (Trailing comma not allowed in standard JSON)
Frequently Asked Questions (FAQ)
The official JSON specification (RFC 8259) does not permit trailing commas after the final element in arrays or objects, unlike JavaScript.