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JSON Validator

Validate JSON and pinpoint syntax errors with the exact line and column. Format valid JSON, all in the browser.

Live·100% in your browser — no upload

What is JSON Validator

The JSON Validator checks whether a text is valid JSON according to the standard and, when it finds an error, tells you exactly at which line and column it is — so you can spot a stray comma or an unclosed bracket instantly. If the JSON is valid it can also reformat it with clean indentation.

Validation uses the browser's native parser and runs locally: your JSON is never sent to a server.

How it works

  1. Paste the JSON into the box.
  2. Press Validate for a quick check, or Validate and format to also get the indented output.
  3. On error, read the line and column shown and fix it.
  4. Copy the formatted JSON when it is valid.

Frequently Asked Questions

What is the difference between validating and formatting?
Validating only checks whether the JSON is correct. Formatting adds indentation to make it readable: here you can do both with 'Validate and format'.
What does 'line and column' indicate?
The exact position of the first syntax error in your text, so you can go straight to the point instead of re-reading everything.
Is the JSON sent online?
No. Validation happens entirely in the browser with the native parser: no data leaves your device.

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