JSON Formatter & Diff Viewer is a comprehensive online tool designed to enhance your JSON handling experience. This free tool offers a range of features including JSON formatting, validation, beautification, and minification. With its Monaco Editor integration, users can enjoy syntax highlighting and error detection, making it easier to spot mistakes in JSON code. Additionally, the tool supports side-by-side comparison and diff viewing for JSON, code, and text files, accommodating over 19 programming languages such as JavaScript, TypeScript, and Python. Key features include configurable editor options, code folding, word wrap, and the ability to sort object keys. The tool is accessible without any signup, providing a seamless experience for developers and data analysts alike. Whether you need to format, validate, or compare JSON files, this tool is equipped to handle your needs efficiently.