Free Online JSON Validator

Validate JSON syntax and get a quick success or error message.

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About This Tool

The JSON Validator checks whether pasted JSON is valid and returns a clear success or error message. It is useful when testing APIs, editing config files, debugging payloads, or checking copied JSON before using it elsewhere.

Benefits and Use Cases

  • Validate API responses and request bodies
  • Check config snippets before deployment
  • Find syntax errors in copied JSON
  • Work locally without sending data to a server

How to Use

  1. Paste JSON into the input box.
  2. Click Validate JSON.
  3. Read the validation result in the output box.

Frequently Asked Questions

Does this modify my JSON?

No. It only reports whether the JSON is valid.

Can it validate arrays?

Yes. JSON objects, arrays, strings, numbers, booleans, and null are supported.

Is this tool free?

Yes. It is free and browser-based.