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JSON Formatter & Validator

Instantly beautify messy JSON, compress data, and validate syntax errors.

How to Format and Validate JSON?

Working with APIs or configuration files often means dealing with massive, unreadable blocks of JSON data. Our free JSON Formatter & Validator makes debugging and reading code effortless:

  1. Paste your Code: Drop your raw, minified, or messy JSON string into the text editor.
  2. Beautify or Minify: Click "Beautify JSON" to automatically add perfect spacing and indentation so humans can read it. Click "Minify JSON" to strip all spaces and line breaks, compressing the data size for production servers.
  3. Validate Syntax: Click "Validate JSON" to instantly check for missing commas, unclosed brackets, or trailing spaces. If there's an error, the tool will point it out immediately.

Frequently Asked Questions (FAQ)

What is JSON?

JSON (JavaScript Object Notation) is a lightweight, text-based data format used primarily to transmit data between a server and a web application. It is the standard language of the modern web API.

Why is my JSON invalid?

The most common JSON syntax errors include: leaving a trailing comma after the last item in a list, using single quotes (') instead of double quotes (") around keys or strings, or forgetting to close a bracket.

Is it safe to paste API keys or sensitive data here?

Yes. This tool is built using 100% client-side JavaScript. This means your JSON data is processed entirely on your local machine. Nothing is ever sent over the internet or saved to our servers.