Nashorn is a JavaScript engine developed in the Java programming language originally by Oracle and later by the OpenJDK Community.

[7] On December 21, 2012, Oracle announced Nashorn source was publicly released in the OpenJDK repository.

[10] With the release of Java 11, Nashorn was deprecated citing challenges to maintenance, and has been removed from JDK 15 onwards.

Nashorn [ˈnaːsˌhɔɐ̯n] ("nahss-horn") is the German translation of rhinoceros, a play on words on Rhino, the name of a JavaScript engine implemented in Java and provided by Mozilla Foundation.

[13] According to Oracle benchmarks, Nashorn performance is several orders of magnitude faster than the alternative Rhino JavaScript engine.