Developing Telegram Mini Apps with Vanilla JavaScript

Telegram Mini Apps are transforming how users interact with services directly inside the chat interface. If you want to build functional web applications within this ecosystem without getting lost in complex frameworks, mastering core web technologies is the perfect starting point. This text-only course guides you through the step-by-step process of designing, coding, and launching a responsive online store app inside Telegram. You will learn how to leverage vanilla JavaScript, HTML, and CSS to handle user interactions, integrate with the Telegram WebApp API, and manage persistent data. What you'll learn: Understand the core architecture, security, and setup of Telegram Mini Apps; Build a responsive, mobile-first product catalog and shopping cart using modern CSS; Implement interactive features and state management using clean, modern JavaScript; Integrate the Telegram WebApp API for user authentication and native interface features; Configure local data storage using localStorage to keep user cart data persistent; Deploy and publish your completed Mini App to make it live for real users. You will start with foundational concepts of web development and the Telegram ecosystem before moving on to hands-on coding exercises. The written material guides you through UI design, API integration, data persistence, and the final deployment process. This course is designed for aspiring developers and beginners who have a basic understanding of HTML and CSS and want to build real-world applications without the overhead of heavy frameworks. Start reading today and build your first fully functional Telegram Mini App from the ground up.