OmniToolKit
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JSON Formatter & Validator

Format, validate, and minify your JSON data in real time. 100% private browser-side execution.

How to Format JSON Online

  1. Paste your raw or minified JSON string into the left input box.
  2. Click Format (2 Spaces) or Format (4 Spaces) to prettify the JSON hierarchy.
  3. If there is a syntax error (such as a missing quote or trailing comma), an error message will highlight the problem.
  4. Click Copy Output to copy the clean JSON directly to your clipboard.

Frequently Asked Questions

Is my JSON data stored or sent to a server?

No. All formatting, validation, and minification runs locally inside your browser's JavaScript engine. Your data never leaves your device.

What is the difference between Prettify and Minify?

Prettify adds line breaks and whitespace indentation to make JSON readable for developers. Minify strips all unnecessary whitespace to reduce file size for network transport.

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