ShadowReference
ShadowReference
Data & JSON

JSON Validator

Free online tool · runs in your browser

Check JSON syntax instantly.

…

Quick tutorial

  1. 1Paste JSON.
  2. 2Click Validate.
  3. 3Fix errors shown in the message.

Free online json validator

This free JSON validator checks whether your text is valid JSON and highlights syntax problems with line and column hints. Use it as an online JSON lint or JSON checker before you ship an API payload or config file. Validation happens locally — nothing is uploaded. If you also want indented output, use the JSON Formatter; this tool focuses on catching invalid JSON quickly.

How to use JSON Validator

  1. Paste JSON.
  2. Click Validate.
  3. Fix errors shown in the message.

Limitations

  • Only checks syntax, not schema.

Example

Input

{"broken":}

Output

Invalid JSON at line 1, column 12: ...

FAQ

Frequently Asked Questions

How do I validate JSON online?

Paste your JSON and click Validate. If the syntax is invalid, the tool reports the error location so you can fix trailing commas, missing quotes, or extra commas.

Is this the same as JSONLint?

It serves the same job as a JSON lint/checker: confirm the document is valid JSON. It does not check JSON Schema.

Does JSON validation happen on a server?

No. Parsing runs in your browser with the built-in JSON parser.

What's the difference from JSON Formatter?

This tool focuses on validation without reformatting.

Is JSON Validator free to use?

Yes. JSON Validator on ShadowReference is free, with no account, no watermarks, and no server-side processing.

Does this tool send my data to a server?

No. All processing happens locally in your browser. Your input never leaves your device.

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