I've written a (non-OSS, so no link, sorry) lib in JS that I ported to Ruby, C# and Java. The API methods in JavaScript are all lower camelCase as are the Java

I've written a (non-OSS, so no link, sorry) lib in JS that I ported to Ruby, C# and Java. The API methods in JavaScript are all lower camelCase as are the Java ones. The C# ones are all upper CamelCase and the Ruby ones are all lower snake_case (or whatever it's called). Basically, I try to follow the conventions of whatever language I'm working in because that just makes it easier for people working in that language to incorporate your lib. And yes, lowerCamel seems to be the default for JS. For a JSON wire protocol it's different, because it's not a language specific API that you're exposing, it's a protocol, which is a different beast. For text-based wire-protocols I prefer to 'ignore' case (because of ambiguity) by sticking with lowercase all the way. Names need separators and the underscore works nicely for that everywhere. Keys I use for sending over the wire therefore follow the Ruby style.