How to Build Your First Telegram Mini App: A Step-by-Step Guide

Telegram vs. WeChat: The Battle of the Super Apps

WeChat has been the undisputed leader among super apps for years. Launched in 2011, it became an integral part of daily life in China by seamlessly combining messaging, social media, payments, and e-commerce into a single platform. Telegram, although a later entrant in 2013, has rapidly gained ground and is making waves as a strong contender in the global super app space. Today, developers can start building innovative services and even build Telegram Mini Apps directly inside Telegram. With the right mini app documentation, anyone who needs to create a new Telegram bot or design a Telegram mini app using familiar web technologies can dive into app development more easily than ever.

Key Differences Between Telegram and WeChat:

WeChat has long dominated the Chinese market as an all-in-one app, but Telegram is making serious moves to challenge it on the global stage. With its focus on privacy, cutting-edge features, and tools for developers, Telegram is carving out a unique space. Thanks to Telegram Mini Apps (TMA), developers can now create web apps that integrate seamlessly into the platform, helping it quickly narrow the gap and expand its appeal worldwide.

Now, let’s dive into how you can create a Telegram Mini App and join the growing wave of developers leveraging Telegram’s potential.

What Are Telegram Mini Apps, and Why Are They So Popular?

Telegram Mini Apps (TMA) are essentially web applications running inside the Telegram platform. Think of them as standard websites built with HTML, CSS, and JavaScript, but with access to Telegram’s unique features through the SDK. These apps are launched within Telegram, providing a seamless user experience, data integration, and built-in payment systems. To use Telegram effectively for mini apps, developers typically create a Telegram bot via BotFather, assign it a username, and configure settings to connect the bot with their app. Once set up, mini apps can be shared in Telegram groups or directly with users, making them a powerful extension of the ecosystem. Understanding how Telegram Mini Apps work is crucial for developers looking to leverage this platform.

Why Developers Love TMAs:

Examples of Successful Telegram Mini Apps

Let’s take a look at a few real-world examples to see what’s possible:

• Wallet – An example of wallet services accessed through Telegram; features depend on the specific wallet and region.
• Hamster Kombat – A tapper game that gained massive engagement.
• DurgerKing – Telegram’s sample Mini App for trying a food-ordering and payment flow.

How to Get Started with Telegram Mini Apps

What You Need:

• A code editor (VS Code or WebStorm will work fine).
• Basic knowledge of HTML, CSS, and JavaScript.
• Telegram installed on your phone and computer.
• The desire to explore something new.

Step 1: Create a Helper Bot

Your journey starts with creating a Telegram bot. This bot will act as the entry point for your application. Here’s how to do it:

1. Search for @BotFather in Telegram.
2. Send the command /newbot.
3. Choose a name for your bot.
4. Save the token provided by BotFather securely on your server—you’ll need it for the Bot API. Never put it in browser code or a public repository.

Below is Node.js code for your server. Install node-telegram-bot-api, define token from a server-side environment variable, and replace https://your-domain.com/app with your deployed HTTPS URL before running it. The inline web_app button is intended for a private chat with the bot:

javascript
const TelegramBot = require('node-telegram-bot-api');
const bot = new TelegramBot(token, { polling: true });

bot.onText(/\/start/, (msg) => {
const chatId = msg.chat.id;
bot.sendMessage(chatId, 'Welcome! Click the button below to open the app.', {
reply_markup: {
inline_keyboard: [[
{
text: 'Open App',
web_app: { url: 'https://your-domain.com/app' }
}
]]
}
});
});

Step 2: Set Up Your Environment

Create a basic project structure to build a Telegram Mini App and set up your test environment:

Project directory layout (the index.html contents follow in Step 3):

text
my-tma/
├── index.html
├── styles/
│ └── main.css
├── scripts/
│ └── app.js
└── assets/
└── images/

Step 3: Build Your App

Save this HTML as index.html. It loads the Telegram WebApp bridge and scripts/app.js. This is a UI example, not an authentication implementation: validate Telegram initData on your backend before trusting user identity.
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>My First TMA</title>
<link rel="stylesheet" href="styles/main.css">
<script src="https://telegram.org/js/telegram-web-app.js"></script>
</head>
<body>
<div id="app">
<h1>Hello, Telegram!</h1>
</div>
<script src="scripts/app.js"></script>
</body>
</html>

Styling Your App

Save the JavaScript below as scripts/app.js; setupTheme applies Telegram’s theme colors, while styles/main.css is a separate stylesheet you can customize. Test in Telegram on Android and iOS. Important: sendData works only for Mini Apps launched from a reply-keyboard web_app button, not the inline button in Step 1. To save data from that inline launch, implement a backend endpoint and validate initData; this sample does not persist data or handle incoming web_app_data messages:

javascript
const app = {
data: { count: 0 },

init() {
this.setupTheme();
this.setupCounter();
this.setupMainButton();
},

setupTheme() {
const theme = window.Telegram.WebApp.themeParams;
document.body.style.backgroundColor = theme.bg_color;
document.body.style.color = theme.text_color;
},

setupCounter() {
const counter = document.createElement('div');
counter.innerHTML = `
<h2>Counter: <span id="count">0</span></h2>
<button id="increment">+1</button>
<button id="decrement">-1</button>
`;
document.querySelector('#app').appendChild(counter);

document.querySelector('#increment').onclick = () => this.updateCount(1);
document.querySelector('#decrement').onclick = () => this.updateCount(-1);
},

setupMainButton() {
const MainButton = window.Telegram.WebApp.MainButton;
MainButton.setText('Save');
MainButton.onClick(() => this.saveData());
MainButton.show();
},

updateCount(delta) {
this.data.count += delta;
document.querySelector('#count').textContent = this.data.count;
},

saveData() {
window.Telegram.WebApp.sendData(JSON.stringify(this.data));
}
};

window.Telegram.WebApp.ready();
app.init();

Expanding Functionality

After building the basics, you can enhance your mini app using advanced features:

• Add TON-based Web3 features where appropriate; purchases of digital goods and services inside Telegram must use Telegram Stars rather than TON.
• Add Telegram Stars payments for digital goods and services, with proper payment confirmation and refund handling.
• Save user data on a server after validating initData and checking all submitted values.
• Add animations and advanced logic.
• Add bot notifications with the required user permission; a Mini App cannot message arbitrary users.
• Add a menu button for navigation.

What’s Next?

1. Deploy your app on an HTTPS server.
2. Connect your app to Telegram via @BotFather.
3. Debug and test in real-world conditions.
4. Launch your Telegram Mini App and gather initial feedback.
5. Share your code on GitHub for community feedback, excluding bot tokens, secrets and personal data.
6. Gather user feedback and iterate.

By following these steps, you’ll be well on your way to creating a successful Telegram Mini App that takes full advantage of the platform’s growing ecosystem.