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JSON Validator

Check if your JSON is valid and see exactly where it breaks.

How to use JSON Validator

  1. 1Paste the JSON you want to check.
  2. 2Click Validate.
  3. 3See a clear pass/fail result with the exact error if it fails.

Why use this tool

  • Pinpoints the character position of syntax errors.
  • Distinguishes between valid JSON and valid-looking JS objects (JSON is stricter).
  • No file size limit issues — validation runs locally in your browser.

Frequently asked questions

Why does my JSON fail even though it looks correct?

Common causes are trailing commas, single quotes instead of double quotes, or unquoted keys — all valid in JavaScript objects but not in strict JSON.

Can I validate very large JSON files?

Yes, validation is handled by the browser's native JSON parser, which is fast even on large payloads.

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