### JavaScript (api/bot.js)

const { Telegraf } = require('telegraf');
const express = require('express');
const axios = require('axios');

const app = express();
app.use(express.json());

const bot = new Telegraf(process.env.BOT_TOKEN);

// Handle Telegram updates
bot.start((ctx) => ctx.reply('Welcome to your Telegram bot!'));
bot.help((ctx) => ctx.reply('Send me a message and I will echo it back!'));
bot.on('text', (ctx) => ctx.reply(`You said: ${ctx.message.text}`));

// Set up webhook handling
app.post('/api/bot', async (req, res) => {
  try {
    await bot.handleUpdate(req.body, res);
  } catch (error) {
    console.error('Error handling update:', error);
    res.status(500).send('Error processing update');
  }
});

// Handle verification requests
app.get('/api/bot', (req, res) => {
  res.send('Bot is running');
});

module.exports = app;
---

### Vercel Configuration (vercel.json)
{
  "version": 2,
  "routes": [
    {
      "src": "/api/.*",
      "dest": "/api/bot.js",
      "methods": ["GET", "POST"]
    }
  ]
}
---

### Package Configuration (package.json)
{
  "name": "telegram-bot",
  "version": "1.0.0",
  "main": "api/bot.js",
  "scripts": {
    "start": "vercel dev",
    "deploy": "vercel --prod"
  },
  "dependencies": {
    "express": "^4.18.2",
    "telegraf": "^4.12.2",
    "axios": "^1.6.2"
  },
  "devDependencies": {
    "vercel": "^34.0.0"
  }
}
---

### Set Webhook Command
https://api.telegram.org/bot<BOT_TOKEN>/setWebhook?url=<YOUR_VERCEL_URL>/api/bot
---

### Environment Variable Setup for Vercel
vercel env add BOT_TOKEN