Developer tool

JSON Validator

Paste JSON to validate it and see whether it is valid, plus error details if not.

Input

Output

Ready.

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FAQ

What does “valid JSON” mean?

Valid JSON must follow strict syntax rules: double-quoted keys/strings, no trailing commas, and proper brackets.

Can the validator fix JSON automatically?

It can format valid JSON. If the JSON is invalid, you will see the error so you can correct it.

Is my JSON sent anywhere?

No. Validation runs locally in your browser.