JSON Validator
Validate JSON syntax with line-number error pinpointing and clear diagnostic descriptions.
100% Client-Side · No Upload
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What is JSON Validator?
JSON Validator is a syntax validator and linter designed to pinpoint the exact location of syntax errors in a JSON string. Unlike basic checkers, our validator parses your JSON structure and highlights the line numbers, character positions, and expected tokens for any invalid segments. It helps you debug APIs, config files, and payloads in seconds.
How to use JSON Validator?
1
Paste the JSON content you want to lint into the validator panel.
2
The tool automatically runs validation in real-time as you type, or you can click "Validate".
3
If an error exists, the editor highlights the exact line with a red marker and displays a clear explanation of what is wrong.
4
Once corrected, you will see a green "Valid JSON" confirmation and can copy or format the results.
Interactive Example
Locating a syntax errorTEXT
Input / Sample Source
{
"name": "Alice",
"age": 30,
"role": "Admin", // <-- Trailing comma is invalid in JSON
}Output / Result
Error: Unexpected character '}' at line 5 column 1. Trailing comma found.Benefits & Features
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Precise Line PinpointingInstant red highlights directly on the line of failure.
✓
Real-time LintingCatch structural issues dynamically as you type or edit.
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Standardized ValidationValidates strictly against RFC 8259 specifications.
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Detailed DiagnosticsUnderstand why the JSON is invalid instead of just seeing a generic error.