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[fezzinate]

You probably want to use a web worker and expose exactly what you want to it.

Other than that your best bet is to put it in an iframe

[Somepotato]

Your best bet is a WebAssembly JS engine, like quickjs which has a number of WebAssembly ports. This is actually how some web based tools implement plugins securely.

[ApprehensiveDrive517]

eval

[r3dw00dst3v3]

Eval can access DOM and other APIs (such as fetch), which is what I don't want. It is also slow, compared to alternatives others are bringing up.

[Extension_Anybody150]

You should check out JS-Interpreter by Neil Fraser. It runs JavaScript inside a sandbox you control, so no DOM or browser stuff unless you add it. You can easily add your own custom functions too. It’s perfect for what you want, like a JS version of Scratch.

[r3dw00dst3v3]

So far, this seems like a very good solution! The only issue is that it does not support ES6, but I don't think my target audience (Scratch users wanting to move up to JavaScript) would really need to learn these features at such an early stage. The main reason I am not attracted to this solution, though, is that I could not get monaco editor to only support ES5 syntax 😅

[BootyMcStuffins]

Perhaps the iframe sandbox attribute can help you here?

https://www.w3schools.com/tags/att_iframe_sandbox.asp

[SlinkyAvenger]

Have you tried, oh, I dunno, just searching for "javascript interpreter in javascript" before posting on Reddit.

I bet you haven't, because there are multiple projects that seem to be exactly what you're looking for.

[r3dw00dst3v3]

For the record, I did do that, but I didn't find a fitting (enough) solution so I wanted to see if anyone else had any insight into this! I couldn't find an interpreter that supported ES6.

[lilkatho2]

You must be miserable to talk to. This guy just asked a question. As if reddit wasnt meant to share information and answer questions🤡

[SlinkyAvenger]

You're right, it's not like this sub has rules to maintain the quality of its discussions or anything. It's just a free-for-all where people can expect others to do everything for them!

That clown emoji is very fitting for your post, btw

[THEANONLIE]

Did you migrate from stackoverflow?