JSON Formatter
Beautify and validate JSON with syntax highlighting
About This Tool
What is JSON?
JSON (JavaScript Object Notation) is a lightweight, text-based data interchange format. It is easy for humans to read and write, and easy for machines to parse and generate. JSON is defined by RFC 8259 and has become the de facto standard for APIs, configuration files, and data storage.
Why Format JSON?
When JSON data is transmitted over networks or stored compactly, it is often minified — all whitespace is removed to reduce file size. While efficient for machines, minified JSON is nearly impossible for humans to read. A JSON formatter (also called a beautifier or prettifier) adds consistent indentation, line breaks, and spacing to make the structure immediately visible.
Features
This tool supports customizable indentation (2, 4, or 8 spaces), optional alphabetical key sorting, and instant validation with clear error messages. It runs entirely in your browser — no data is ever sent to a server.
Common Use Cases
Developers use JSON formatters to debug API responses, inspect configuration files, prepare test data, and review log output. Properly formatted JSON is also essential for code reviews and documentation.