An Open Source, embeddable engine for JavaScript and WebAssembly. Maintained by the SpiderMonkey team at @mozilla.

Read about the latest SpiderMonkey changes here: https://spidermonkey.dev/blog/

Learn about the engine: https://spidermonkey.dev/docs/

Browse the code: https://searchfox.org/mozilla-central/source/js/src

Check out our online demo of SpiderMonkey compiled to WebAssembly! https://mozilla-spidermonkey.github.io/sm-wasi-demo/