JSON Validator
Free online JSON syntax validator with precise line and column error reporting.
Valid JSON syntax
JSON input
Validated output
How JSON Validation Works
The JSON validator parses input text using strict JSON syntax rules and identifies exact error locations if parsing fails. All operations execute locally in memory.
Frequently Asked Questions
Is my JSON data uploaded to a server?+
No, validation occurs 100% locally inside your web browser.
What JSON errors can the validator find?+
It detects strict JSON syntax errors such as missing commas, unquoted keys, invalid escapes, and unmatched brackets.
Does valid JavaScript always count as valid JSON?+
No. JSON is stricter than JavaScript and does not allow comments, trailing commas, undefined, or single-quoted strings.
Related Tools
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