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JSON Formatter Online — Beautify & Validate JSON

Free, browser-based JSON formatter. Instantly format, validate, and beautify JSON with 2 or 4-space indentation. Your data never leaves your browser.

Indent:

What is a JSON Formatter?

A JSON formatter (also called a JSON beautifier or JSON pretty-printer) takes minified, compressed, or completely unformatted JSON strings and adds consistent indentation, spaces, and line breaks to make it easy for developers to read and understand the underlying data structure.

This tool is entirely browser-based, meaning all the formatting and validation happens in your device’s memory. No data is transmitted to an external server, keeping your sensitive information completely private.

Features

  • Choose between 2-space or 4-space indentation
  • Instantly identifies syntax errors with an inline message
  • Fast and reliable parsing using native JavaScript APIs
  • Single-click copy to clipboard

How to use this JSON Formatter

  1. Paste your JSON: Drop your unformatted JSON text into the “Input” panel on the left.
  2. Review the Output: The formatter will automatically attempt to parse and format your JSON, displaying the result on the right.
  3. Adjust settings: Choose your preferred indentation size from the top toolbar.
  4. Copy the result: Once satisfied, click “Copy output” to quickly save the beautified JSON to your clipboard.