Many projects use duktape (https://duktape.org/)

There's also XS6 engine. But I dislike the macro trickery in that one.

Looks like QuickJS doesn't use setjmp/longjmp, as opposed to duktape. I really like this, as it will simplify memory management inside C functions, and allow to use gcc cleanup functions.

So I used QuickJS for a while today and it's the easiest JS engine of those I used so far (Duktape, XS6) to embed, even without extensive docs.

I can't be happier that it doesn't use setjmp/longjmp to handle exceptions. It makes memory management easier.

Everything is very straightforward. You can even get ref leaks report if you use -DDUMP_LEAKS.