JSON Validator
JSONValidate JSON syntax and get detailed error messages
All processing happens locally in your browser — your data never leaves your machine.
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Examples
Valid JSON
Input
{"name": "John", "age": 30}Output
Valid JSONInvalid - Trailing Comma
Input
{"name": "John", "age": 30,}Output
Error: Unexpected token } at position 28Invalid - Missing Quotes
Input
{name: "John"}Output
Error: Unexpected token n at position 1Frequently Asked Questions
- What errors does the JSON Validator detect?
- The validator detects all JSON syntax errors including missing commas, unclosed brackets, invalid escape sequences, trailing commas, and more. It provides the exact position where the error occurs.
- Can I validate large JSON files?
- Yes. Since validation runs locally in your browser, there's no upload limit. Performance depends on your device but typically handles files up to several megabytes without issues.