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JSON Validator
Check if your JSON is valid and pinpoint exactly where errors occur — instantly and for free. Get the exact line and column of any syntax issue along with a plain-English explanation of what went wrong, so you can fix it fast. Everything runs locally in your browser — nothing is ever uploaded.
Need to format or minify valid JSON?Try our JSON Formatter
Paste or upload JSON below to validate syntax instantly.
Validated 100% locally
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Validated locally in your browser — never uploaded anywhere.
Frequently Asked Questions
Everything You Need to Know About JSON Validation
A JSON validator checks whether your data follows correct JSON syntax rules — properly matched brackets and braces, correctly quoted keys and string values, valid data types, and no trailing commas. If any rule is broken, the JSON is considered invalid and won't be parsed correctly by applications or APIs expecting it.
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