The backend of a website is the part that’s responsible for providing all of the necessary technology to run the site. This includes databases, content management systems, e-commerce options, forums, and more.

Here is the list of best backend frameworks in 2021

1.Express.js

Express.js is a minimal and flexible Node.js web application framework, providing a robust set of features for building single and multi-page, and hybrid web applications. It's an ideal starting point for Node.js newcomers and a great framework for experienced developers who want to keep their codebase simple and maintainable. This framework is good for API-based applications and for large applications.

2.Laravel

Laravel is an open-source, free, web application framework, written in PHP. Laravel is developed with a focus on the application structure, code elegance, and productivity. The developers at Laravel work on the operations of the framework, and also write new features for it. The core development team is led by Taylor Otwell. This framework is good for startups and small businesses.

3.Django

Django is a high-level Python Web framework that encourages rapid development and clean, pragmatic design. Built by experienced developers, it takes care of much of the hassle of Web development, so you can focus on writing your app without needing to reinvent the wheel. This framework is good for rapid web development with an admin backend.

4.Flask

Flask is a Python microframework used for web development. It is designed to make the development of web applications simpler. Flask is installed via pip and is as easy to install as any other Python library. It’s currently one of the more popular web frameworks I’ve seen used in real-world web development situations. This framework is mostly used for AI and Machine Learning projects.

5.Spring Boot

Spring Boot is a revolutionary new launch tool for Java applications. The framework lets you build standalone, production-grade Spring-based Applications that you can “just run.” It gives you all of the benefits of the Spring application platform plus the added boost of not needing to create a complex XML configuration file or make any changes to the underlying code. This framework is mostly used by enterprise applications.