File Format Guides
Comprehensive guides for popular file formats. Learn the structure, history, use cases, advantages, and technical details of each format.
Code & Data
JSON
application/json
JSON (JavaScript Object Notation) is a lightweight, human-readable data interchange format used universally in web APIs, configuration files, and data storage.
XML
application/xml
XML (Extensible Markup Language) is a flexible, self-describing markup language for structured data used in web services, configuration, and document formats.
Understanding File Formats
File formats define how data is encoded, structured, and stored in files. Understanding file formats is essential for developers, QA engineers, data analysts, and anyone working with digital files. Our guides cover the most commonly used formats across documents, code, data, images, and video.
For Developers
Learn about MIME types, magic bytes, file structure, and encoding details. Understand how to parse, validate, and generate files in different formats. Use our online tools to validate and inspect files.
For QA & Testing
Understand format specifications to create better test cases. Download sample files for every format, or generate custom test files with specific properties.