Boring Tools
JSON → Validation

Check whether JSON is valid.

Paste a JSON document and receive an immediate local syntax result.

🔒 Processed locallyYour input stays on this device and is never uploaded to Boring Tools.
Result

How to use JSON Validator

Validation confirms that a document follows JSON grammar. It does not verify a business schema, API contract, or whether values are semantically correct.

Steps

  1. Paste the JSON document.
  2. Run validation.
  3. Use the parser message to correct invalid syntax.

Formats, limits, and accuracy

Common problems include trailing commas, missing quotation marks, unescaped line breaks, and mismatched braces or brackets.

Frequently asked questions

Does valid JSON mean my API accepts it?

No. An API may require additional fields and value rules.

Is there a file size limit?

Only the practical memory limit of your browser tab.

Practical notes

The result reports syntax, not JSON Schema compliance.

Format valid JSON afterward for easier review.

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