Thanks. So Node is actually using multiple threads behind the scenes or did I read that wrong? How do I know which kind of operations are pushed there by libuv?
Yeah, there's a pool of non-blocking C++ threads that do the work behind the scenes. Any async operation gets pushed out, and honestly most functions will behave asynchronously. JSON parsing is a sync operation that usually doesn't block for very long because it will be a small operation 99.9% of the time, so it's kind of a pitfall because you almost never see this blocking issue unless your parsing huge JSON objects. In nodeland things are kind of expected to be asynchronous, and if they are not they should be labeled as such so that everyone using it knows. Checkout the FileSystem (fs) nodejs lib, you'll see calls explicitly labeled as "sync" to denote that they are blocking.
