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JSON Validator

Validate JSON against the spec and pinpoint syntax errors with line and column numbers.

Available nowNo account requiredDeveloper Tools

JSON Validator

Strict, spec-compliant JSON validation with line and column errors.

Waiting for JSON…

How to use JSON Validator

  1. 1

    Paste JSON

    Drop the JSON you want to validate into the input box.

  2. 2

    Get instant feedback

    Valid JSON shows root type, key count, and size. Invalid JSON shows the parser error with line and column.

  3. 3

    Fix and re-check

    Edit your input and the validator re-runs automatically — no submit button needed.

About JSON Validator

Validate JSON against the spec and pinpoint syntax errors with line and column numbers.

Use JSON Validator when you need to strict json validator with errors. Review the available options in the interface, process your input, and check the result before saving or copying it.

Frequently asked questions

  • It uses the browser's built-in JSON.parse, which follows RFC 8259 strictly. Trailing commas, comments, and unquoted keys all fail.

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