SpiderMonkey

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SpiderMonkey is Mozilla’s JavaScript and WebAssembly Engine, used in Firefox, Servo and various other projects. It is written in C++, Rust and JavaScript. You can embed it into C++ and Rust projects, and it can be run as a stand-alone shell. It can also be compiled to WASI.

Cost / License

Free
Open Source (MPL-2.0)

Platforms

Mozilla Firefox

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SpiderMonkey information

Developed by
Unknown
Licensing
Open Source (MPL-2.0) and Free product.
Alternatives
2 alternatives listed
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Supported Languages
- English

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SpiderMonkey was added to AlternativeTo by Lunatica on Nov 20, 2020 and this page was last updated Aug 11, 2025.

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What is SpiderMonkey?

SpiderMonkey is Mozilla’s JavaScript and WebAssembly Engine, used in Firefox, Servo and various other projects. It is written in C++, Rust and JavaScript. You can embed it into C++ and Rust projects, and it can be run as a stand-alone shell. It can also be compiled to WASI.