Node.js uses Google's V8 JavaScript engine from Chrome to run and execute JavaScript code outside the browser. SEE: Hiring Kit: Python developer (TechRepublic Premium) ...

PyScript lets you run Python scripts right in the browser, side by side with JavaScript, with two-way interaction between your code and the web page.

How to Execute a Servlet in Netbeans. Netbeans gives programmers and Web designers the ability to create Java and JSP servlets, which run customized code in a user's browser.

However, although these in-app browsers are based on Safari’s WebKit on iOS, developers can modify them to run their own JavaScript code.