How to Connect Backend to Frontend: A Complete Guide with POST Request Example In modern web development, building a full-stack application means handling both frontend and backend. The frontend is what users interact with—buttons, forms, and visuals. The backend handles data, logic, and connections with databases. This guide will walk you through how to connect your backend and frontend , specifically focusing on making a POST request from the frontend to the backend using JavaScript and Node.js with Express . What Is a POST Request? A POST request is one of the HTTP methods used to send data to a server. For example, when you submit a login form, your email and password are sent using a POST request to the backend for verification. Basic Setup: Tools You'll Need Frontend : HTML, JavaScript Backend : Node.js, Express.js Database (optional): MongoDB (with Mongoose) Postman (optional): For testing APIs VS Code or any code edito...