Overview

A JavaScript engine is a program or an interpreter that executes JavaScript code. A JavaScript engine can be implemented as a standard interpreter, or just-in-time compiler that compiles JavaScript to bytecode in some form.

This is a list of popular projects that are implementing a JavaScript engine:

• V8 — open-source, developed by Google, written in C++
• Rhin****o — managed by the Mozilla Foundation, open-source, developed entirely in Java
• SpiderMonkey — the first JavaScript engine, which back in the days powered Netscape Navigator, and today powers Firefox
• JavaScriptCore — open-source, marketed as Nitro and developed by Apple for Safari
• KJS — KDE’s engine originally developed by Harri Porten for the KDE project’s Konqueror web browser
• Chakra  (JScript9) — Internet Explorer
• Chakra  (JavaScript) — Microsoft Edge
• Nashorn, open-source as part of OpenJDK, written by Oracle Java Languages and Tool Group
• JerryScript — is a lightweight engine for the Internet of Things.

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