What is a Node.js Developer?
Node.js developers use Node.js to build scalable network applications as an asynchronous, event-driven JavaScript runtime. It handles many connections concurrently, and each one fires a callback, but if there is no work to be done, Node.js will sleep.
Node.js presents an event loop as a runtime construct instead of a library. In other systems, a blocking call always starts an event loop. Typically, app behavior is defined via callbacks at the beginning of a script. Node.js has no "start the event loop" call. Node.js enters the event loop after executing the input script and exits the event loop when there are no more callbacks to perform. This behavior is very similar to browser JavaScript as the event loop is hidden from the user.
Node.js prioritizes HTTP and is designed for streaming, apps that require low latency, or a web library or framework. It does not have threads, but that doesn't mean it can't take advantage of multiple cores in your environment. Node.js can spawn a child process using the child_process.fork API, and are easy to communicate with. It is built on the same interface as the cluster module, allowing sockets to be shared between processes, enabling load balancing over processing cores.