[throwaway3306a]

Which one is as developed, as universal and as capable as Prolog with CLP and/or DCG?

Serious question, I'd like to have something that's easy to integrate with Node.js.

[Karrot_Kream]

OR-Tools has a lot of bindings in different languages, though Javascript/Node doesn't seem to be a first-class supported environment. Looks like https://www.npmjs.com/package/node_or_tools ports a few solver packages into Node so if those solvers fit your needs you can use this package.