Free JSON Formatter and Validator

Format JSON with indentation and validate JSON syntax directly in your browser.

Helpful note

This checks JSON syntax only, not an API schema or data correctness. Avoid pasting passwords, access tokens or sensitive personal data.

About JSON Formatter & Validator

Make JSON easier to read and validate basic syntax while debugging APIs, configuration files or data exports. Do not paste secrets, tokens or private records into tools unless you are comfortable with the environment.

How to use this tool

  1. Paste JSON into the input box.
  2. Choose Format & Validate.
  3. Copy the formatted JSON or read the error message.

Frequently asked questions

No. It checks JSON syntax, not whether the data matches a particular API schema.

Formatting uses the browser JavaScript engine; the entered JSON is not submitted to a BestSaller server.