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JSON Validator
Validate JSON and get detailed error messages
About JSON Validator
JSON Validator lets you validate json and get detailed error messages.
Category: Encoding.
Frequently asked questions
What's the difference between JSON and JSON5?
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JSON5 is a superset of JSON that allows comments, trailing commas, single-quoted strings, and unquoted keys. JSON5 is valid in some bundlers but not in JSON.parse() or standard APIs.
Why does my JSON fail validation?
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Common causes: trailing commas (not allowed in JSON), single-quoted strings, comments, unquoted keys, or a leading/trailing character. The validator highlights the exact error location.
Does this validate JSON Schema?
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This tool validates JSON syntax only. For JSON Schema validation (checking that data matches a schema definition), a separate tool is needed.