What is Jurassic?

Jurassic is an implementation of the ECMAScript language and runtime. It aims to provide the best performing and most standards-compliant implementation of JavaScript for .NET. Jurassic is not intended for end-users; instead it is intended to be integrated into .NET programs. If you are the author of a .NET program, you can use Jurassic to compile and execute JavaScript code.

Features

• Supports all ECMAScript 3 and ECMAScript 5 functionality, including ES5 strict mode
• Well tested - passes over five thousand unit tests (with over thirty thousand asserts)
• Simple yet powerful API
• Compiles JavaScript into .NET bytecode (CIL); not an interpreter
• Deployed as a single .NET assembly (no native code)
• Basic support for integrated debugging within Visual Studio
• Uses light-weight code generation, so generated code is fully garbage collected
• Tested on .NET 3.5, .NET 4 and Silverlight

See Also

• Documentation
• Conformance
• Benchmarks
• Future plans

Try it Now

You can enter javascript commands into the console below (requires silverlight).

Example: 5+5
Example: Math.sin(3)
Example: for(var i=0;i<8;i++)console.log(i&2?new Array((i&1)+1).join(' ')+'\\':new Array(2-(i&1)).join(' ')+'/')

Acknowledgements

• Thanks to JetBrains for providing a free license for dotTrace Performance 4.0!