NiL.JS

Open source ECMAScript 6.0 (ES2015) (JavaScript) engine.
Licensed under BSD 3-Clause License.

NuGet Package

 var context = new Context(); 
 context.Eval(@"console.log( 
 `This is a JavaScript engine written in C#. 
 This engine can perform js code on NET Framework 4.6.1+, NET Standard 1.3+, NET Core 3.1, 5.0 and 6.0`)"); 

Other Examples