Complete Guide to Building Your First Telegram Mini App

This article will guide you through the end-to-end development process with a real-world food delivery app case study (similar to Durer King), taking you from zero to one. Whether you're a front-end developer or a product manager looking to explore the Telegram ecosystem, this article will help you get up to speed quickly.

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Why Choose Telegram Mini Apps?

Telegram is more than just an instant messaging tool; its open ecosystem offers immense possibilities for developers:

• Native Payment Integration: No need for third-party integrations; complete payment cycles directly using Telegram Payments.
• Low User Acquisition Cost: Users don't need to download additional apps; they can access and use the mini app directly within the chat interface.
• Consistent Cross-Platform Experience: Whether on the web, mobile, or desktop, users enjoy a highly consistent experience.

For this article’s case study, we'll build a complete food delivery system encompassing a Web App + Telegram Bot + Payment Functionality. We’ll use React.js for the front-end and Node.js for the back-end, integrating Telegram's official payment capabilities.

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Tech Stack Selection and Development Preparation

Before we dive in, let's define our technical approach:

• Front-end Framework: React.js + TypeScript (for type safety, suitable for medium to large projects)
• Back-end Service: Node.js (for seamless integration with the Telegram API)
• Development Tool: Telegram Mini App SDK (officially recommended, feature-rich)
• Environment Requirement: HTTPS Protocol (mandated by Telegram)

It's crucial to note that Telegram Mini Apps mandate the use of the HTTPS protocol. This means you'll need to configure an SSL certificate even for local development. We'll detail how to resolve this issue later.

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Step 1: Create a Telegram Bot

All Telegram Mini Apps are launched through a Bot. Let's start by creating one using BotFather:

1. Search for @BotFather in Telegram and open the chat.
2. Send the /newbot command.
3. Follow the prompts to enter your Bot's name and username.
4. Upon successful creation, you'll receive an API Token (keep this safe, you'll need it later).

This token acts like a key, connecting your application to Telegram's servers.

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Step 2: Initialize Project and Install SDK

Next, we'll use the official Telegram Mini App SDK to quickly set up our project:

# Create React + TypeScript project
npx create-react-app my-telegram-app --template typescript
cd my-telegram-app

# Install Telegram SDK
npm install @twa-dev/sdk

The SDK provides a rich set of APIs for tasks like fetching user information, invoking payment interfaces, sending messages, and more. Once installed, open your project in VS Code and start it:

npm start

At this point, your project will be running on http://localhost:3000. However, this isn't sufficient – Telegram requires all Mini Apps to be accessed via HTTPS.

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Step 3: Configure HTTPS Environment

Many developers get stuck here: How do I use HTTPS for local development? There are two solutions:

Solution 1: Use a Local SSL Certificate

Modify the start script in your package.json:

"scripts": {
  "start": "HTTPS=true react-scripts start"
}

This will automatically start your project with a self-signed certificate at https://localhost:3000.

Solution 2: Use ngrok (Recommended)

If you need to test remotely (e.g., on your phone), you can use ngrok to expose your local service to the public internet:

ngrok http 3000

ngrok will generate a public HTTPS address. Copy this address, and you can then use it within Telegram.

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Step 4: Mount the Web App to the Bot

Now, we need to tell Telegram where the Mini App entry point for this Bot is. Go back to BotFather:

1. Send the /mybots command and select the Bot you just created.
2. Click Bot Settings → Menu Button.
3. Enter the HTTPS address you obtained (e.g., https://your-ngrok-url.io).

Once done, open your Bot in Telegram, click the menu button at the bottom, and your Mini App will open within Telegram!

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Step 5: Initialize Code and Test

Clean up the default React code, keeping only the core structure:

import { useEffect } from 'react';
import './App.css';

function App() {
  useEffect(() => {
    // Initialize Telegram SDK
    const tg = (window as any).Telegram.WebApp;
    tg.ready();
    console.log('Telegram WebApp is loaded');
  }, []);

  return (
    <div className="App">
      <h1>Hello Telegram!</h1>
    </div>
  );
}

export default App;

Save the file and refresh your Telegram chat. You should now see the "Hello Telegram!" page, and the console log indicating successful SDK initialization should appear.

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Step 6: Styling Conventions and Global Configuration

To ensure consistent display across different devices, it's recommended to use Normalize.css and set up global styles:

/* App.css */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background-color: var(--tg-theme-bg-color);
  color: var(--tg-theme-text-color);
}

Telegram provides a set of theme variables. Using these variables allows your app to automatically adapt to the user's light or dark mode preferences.

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Future Development Directions

After completing these steps, you'll have a functional Telegram Mini App framework. You can then proceed to:

• Add Page Routing: Implement multi-page navigation using React Router.
• Integrate Back-end APIs: Build interfaces for order management, product listings, etc., using Node.js.
• Implement Payment Functionality: Integrate with the Telegram Payments API to process transactions.
• Optimize User Experience: Add loading animations, error messages, shopping cart logic, and more.

If you require an anti-detect browser for scenarios like managing multiple accounts or automated testing, consider using MasLogin. It can help you simulate different environments during development and testing, mitigating account risks.

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Frequently Asked Questions (FAQ)

Why can't I open my Mini App in Telegram?

• Ensure you are using the HTTPS protocol (HTTP will be blocked).
• Verify that the Bot's Menu Button address is set correctly.
• Check the browser's developer console for any error messages.

When developing locally, do I need to reconfigure ngrok every time I make a change?

If you're using the free version of ngrok, the address changes every time you restart ngrok. It's recommended to:

• Upgrade to a paid ngrok plan (which allows for persistent domains).
• Or explore alternative solutions like Cloudflare Tunnel.

What functionalities does the Telegram SDK support?

Commonly used APIs include:

• window.Telegram.WebApp.ready() - Initialization
• window.Telegram.WebApp.MainButton - Main button control
• window.Telegram.WebApp.initData - Fetch user information
• window.Telegram.WebApp.close() - Close the Mini App

For detailed documentation, refer to the Telegram WebApp API.

How can I test payment functionality in Telegram?

Telegram offers a sandbox environment. You can use test payment credentials for debugging. Refer to the official payment documentation for specific instructions.

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Conclusion

Through this article, you've grasped the core development workflow for Telegram Mini Apps. Remember: start by building a minimal viable version, and then iterate and optimize. Now, start building your own Telegram ecosystem application!