JavaScript is (mainly) interpreted, and not compiled. You could take a look at simple online editors for inspiration. https://js.do/ Is simple and you could run it locally. If you want to achieve compilation in the browser, you'd want WebAssembly More on reddit.com

You dont need "the best code editor". You need the basic understanding of how your code is executed. Sure, some editors might give you easy ways to start a live web server or run your script with node or w/e, but that shouldn't be imporant in this case. Create an index.html and main.js empty files. You can open these files in any editor, even notepad (to prove a point) In your HTML file have the More on reddit.com

TLDR; target an efficient runtime but use Haskell to compile your language. I wrote a basic Lisp compiler in Rust (outputs Rust code). If I had to do it over I'd use Haskell but still target Rust (or C/C++ etc). Using Rust for parsing Lisp and outputting itself was a PITA because (1) no GC which was an unnecessary burden (2) Haskell had way better facilities for exactly this use case. Nothing against Rust, I just used it for the wrong thing. More on reddit.com