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Building an API with Express.jsAn API (Application Programming Interface) is an intermediary that allows different software components to interact with each other. APIs are a fundamental part of modern web and mobile applications. In this blog, we will go step-by-step to create a fast and efficient API using Express.js, a Node.js framework, explaining each step in detail and providing practical examples.1. What is Express.js?Express.js is a web framework for Node.js. It allows you to build APIs for web and mobile applications quickly and efficiently with its minimal and flexible design. Expres..