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What is next JS used for? Next. js is a JavaScript framework created by Zeit. It lets you build server-side rendering and static web applications using React. It's a great tool to build your next website. It has many great features and advantages, which can make Nextjs your first option for building your next web application.Is next JS frontend or backend? Yes. Next. js is a pre-rendered React app in the client-side that users can view and interact with and can be considered as front-end. At the same time, it also does server-side rendering and API routes which can perform server-side code and access data in the database and can be considered as back-end.Is next js a backend? Next. js provides a backend that can server side render a response to request, allowing you to create a dynamic website, which means you will deploy it on a platform that can run Node.Who uses next JS? As of March 2020, the framework is used by many large websites, including Netflix, Docker, GitHub, Uber, and Starbucks. In early 2020, it was announced that Vercel had secured twenty-one million dollars in Series A funding to support improvements to the software.Why next JS is bad? Disadvantages of using NextJS There's only one way of dealing with routes in NextJS, and you can't customize it. NextJS is limited to its file-based router, and dynamic routes are only possible when used with a NodeJS server.