Format, beautify, and validate JSON data instantly with our free online JSON Formatter tool. JSON (JavaScript Object Notation) is the most widely used data format for APIs, configuration files, and data exchange. Our formatter takes minified or messy JSON and transforms it into a clean, readable, properly indented format. It also validates your JSON syntax, highlighting any errors so you can quickly fix them. Perfect for developers debugging API responses, working with configuration files, or preparing JSON data for documentation.
Free, fast, and runs entirely in your browser — no signup, no upload to a server.