Express.js/Node.js
If you have a higher preference to JavaScript over Python for developing backend application, Express web framework is a great alternative to Flask and Django. Express.js is popular web framework written in JavaScript and hosted within a Node.js runtime environment.
Similar to Flask, Express.js is a simple microframework. It has all Flask’s advantages, great documentation and community support, and the ability to produce rapid scalable prototypes. Express.js’ integration with Node.js and the community support for Node.js is one of the best reasons to choose Express for your backend development, you may utilize the vase amount of NPM packages and make your development process easier.