JSON Formatter
Prettify, minify, and validate your JSON data instantly.
What is a JSON Formatter?
JSON (JavaScript Object Notation) is the standard format for data exchange on the web. However, raw JSON data is often returned as a single, unreadable line of text. Our free JSON Formatter and Validator helps developers make their data readable, structured, and error-free.
Key Features
- JSON Prettifier: Turn "minified" JSON into a beautifully indented, human-readable format.
- JSON Validator: Instantly find syntax errors like missing commas or mismatched brackets.
- JSON Minifier: Strip all whitespace to compress your data for production use.
- One-Click Copy: quickly get your formatted data into your code editor.
Developer First
This utility is built to handle large datasets efficiently. Whether you're debugging a REST API response or cleaning up a configuration file, our formatter provides a clean interface without distracting popups or server-side processing.
Frequently Asked Questions
Is the JSON Formatter free and safe to use?
Yes. The JSON Formatter on simple-tools.co.uk is 100% free. All parsing and formatting calculations occur purely inside your browser. No data leaves your machine.
Can it fix invalid JSON?
It highlights syntax errors with exact line positions so developers can easily identify missing brackets, colons, or quotes to fix their JSON layout.
What layout configuration features are supported?
The JSON Formatter supports both pretty-printing with adjustable indentation spacing (2 spaces, 4 spaces, tabs) and compact minification down to a single line.