JSON Validator

Your data never leaves your browser

Validate your JSON data and find syntax errors instantly.

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About JSON Validator

Paste your JSON to instantly check whether it is valid. If there are syntax errors, the tool shows the exact error message and helps you locate the problem.

How to use

  1. Paste your JSON into the input field.
  2. The validator checks your JSON in real time as you type.
  3. See a green checkmark for valid JSON, or a red error message with details.

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Frequently Asked Questions

FAQs about JSON Validator

What counts as valid JSON?

Valid JSON must follow the JSON specification (RFC 8259): properly quoted keys, no trailing commas, no single quotes, and correct nesting of objects and arrays.

Why is my JSON invalid?

Common issues include trailing commas after the last item, single quotes instead of double quotes, unquoted keys, and missing closing brackets.

Can I validate JSON files?

Yes, you can paste the contents of any .json file into the input. The tool handles any size that your browser can process.

Is this tool free?

Yes, completely free with no signup required. Your data stays in your browser.

Does it fix invalid JSON automatically?

No, the tool only identifies errors. You need to fix the issues manually based on the error messages provided.