The “JavaScript Anywhere” paradigm has enabled JavaScript to be used in the Backend Web Applications as well. By learning one programming language called JavaScript you will be able to build a Full Stack Web Application you own. Extending that, Node.js and Express.js have emerged as most sought after frameworks when it comes to developing the backend of a Web Application. Faster development time, Excellent library / package support and ability to develop asynchronous features makes it ideal to develop today’s scalable Web Applications.
Hence learning Node.js and Express.js will give you a big edge in today’s job market.