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JSON Validator

Check JSON validity with clear error line numbers.

How to use

  1. Paste your JSON.
  2. Click validate.
  3. Fix errors at the reported line and re-check.

Frequently asked questions

What does the valid message show?

Whether the root is an object or array and how many keys/items it holds.

Is my JSON private?

Yes - validation runs locally; API payloads never leave your machine.

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