JSONKit

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JSONKit

JSON Beautifier & Minifier

Format and pretty-print your JSON data to make it easier to read, or minify it to reduce file size without changing the data.

Input

Output

What is a JSON Beautifier?

A JSON beautifier (also known as JSON formatter or JSON pretty-printer) takes raw, compact JSON data and formats it with proper indentation, line breaks, and spacing to make it human-readable. JSONKit's beautifier processes everything in your browser — your data never leaves your device. You can also minify JSON to remove whitespace, reducing file size for production use.

How to use

  1. Paste or type your JSON into the input editor on the left.
  2. Click Beautify to pretty-print it with 2-space indentation, or Minify to strip all unnecessary whitespace.
  3. Review the result in the output editor. If the input is not valid JSON, an error message tells you what went wrong.
  4. Copy the result to your clipboard with one click.

Features

  • Pretty-print JSON with consistent indentation and line breaks.
  • Minify JSON into a single line to reduce payload size.
  • Syntax highlighting, code folding and bracket matching powered by the Monaco editor (the editor used in VS Code).
  • Handles large documents quickly because everything runs locally in your browser.
  • No sign-up, no upload: your data never leaves your device.

Frequently asked questions

Does beautifying or minifying change my data?
No. Both operations only change whitespace. Keys, values, and the order of properties stay exactly the same, so the formatted and minified versions are equivalent JSON.
Is my JSON sent to a server?
No. JSONKit parses and formats the JSON with JavaScript running in your browser. Nothing is uploaded, which makes it safe to use with API responses or configuration that contain internal data.
Why do I get an "Invalid JSON" error?
The beautifier requires strictly valid JSON. Common causes are trailing commas, single-quoted strings, unquoted keys and comments. Use the JSON Repair tool to fix these automatically, or the JSON Validator to find the exact line of the error.
When should I minify JSON?
Minify JSON when size matters more than readability, for example when embedding JSON in a URL or HTML attribute, storing it in a database column, or sending it over the network. Keep the beautified version for code reviews and debugging.