The Jakarta Expression Language (EL; formerly Expression Language and Unified Expression Language) is a special purpose programming language mostly used in Jakarta EE web applications for embedding and evaluating expressions in web pages.The specification writers and expert groups of the Java EE web-tier technologies have worked on a unified expression language which was first included in the JSP 2.1 specification (JSR-245), and later specified by itself in JSR-341, part of Java EE 7.