What's Inside a JAR File? Internals and Structure Explained

See what's inside a JAR file — META-INF, MANIFEST.MF, signature files, class files, and resources — and how to view any JAR's contents in your browser.

The Foundation: A Specialized ZIP Archive

The Control Center: The `META-INF` Directory

Organizing Code: Package Structure and Class Files

JAR vs. WAR vs. EAR