Node Js vs React js

The primary difference is that Node.js is a backend runtime environment, while React.js is a frontend UI library. Even though both are powered by JavaScript, they serve entirely different purposes on opposite ends of the web development stack. [1, 2]

Instead of being competitors, they are highly complementary. Developers frequently combine them to build full-stack web applications, with React managing what the user sees and Node.js managing the server behind the scenes. [1, 2]