INPUT - JSON
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100% client-side
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Validate JSON syntax online with our free JSON validator and syntax checker. The tool reports errors with exact line and column numbers, auto-repairs trailing commas and single quotes, and provides real-time validation as you type. Ideal for debugging malformed API responses, config files, and hand-written JSON data.
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Enter the JSON you want to check in the editor. The validator accepts any text and will tell you whether it is valid JSON.
Valid JSON is highlighted in green with a confirmation message. Invalid JSON shows the exact error location with line number, column, and a description of the issue.
Edit your JSON directly in the editor based on the error feedback. The validator re-checks automatically as you type, showing real-time validation status.
The validator catches missing commas, unmatched brackets and braces, trailing commas, single-quoted strings, unquoted keys, duplicate keys, and invalid escape sequences. Each error is reported with its line number and column position.
Yes. The validator can auto-repair several common issues including trailing commas, single quotes around strings, and unquoted property names. Click the repair button to apply automatic fixes, then review the result.
JSON validation checks whether the input conforms to the JSON specification (RFC 8259). JSON linting goes further by enforcing style rules like consistent indentation and key ordering. This tool primarily validates syntax but also formats the output.
This tool validates JSON syntax, not schema conformance. For schema validation, use our JSON Schema generator to create a schema first, then use a schema validator library in your project to check data against it.
The validator checks against the strict JSON specification (RFC 8259). JSON5 features like comments, trailing commas, and single quotes are flagged as errors, though the auto-repair feature can fix trailing commas and single quotes.