JSON Validator
Check if your JSON is syntactically valid. Get exact error position and message on invalid JSON.
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Frequently Asked Questions
What makes JSON invalid?
Common issues: trailing commas after the last element, single quotes instead of double quotes, unquoted keys, comments (not valid in JSON), and missing commas between elements.
Does this validate JSON Schema?
No. This tool validates JSON syntax only, not JSON Schema constraints. For schema validation you need a dedicated schema validator.
About JSON Validator
JSON validation checks that a string strictly conforms to RFC 8259. This tool reports the exact parser error message including the position of the syntax error, making it easy to locate and fix problems.