Telegraf 4 + Express + Webhook

app.js

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

const app = express();
const port = process.env.PORT || 3000;

// Set up the webhook URL
const webhookUrl = `https://your-webhook-url.com/telegraf-bot`;

// Create a new instance of the Telegraf class
const bot = new Telegraf(process.env.BOT_TOKEN);

// Set up middleware to parse incoming requests
app.use(express.json());

// Set up a route to handle incoming webhook requests
app.post(`/telegraf-bot`, (req, res) => {
  bot.handleUpdate(req.body, res);
});

// Start the webhook
bot.telegram.setWebhook(webhookUrl);

// Start the Express app
app.listen(port, () => {
  console.log(`Express server listening on port ${port}`);
});

// Set up the Telegraf bot commands
bot.start((ctx) => ctx.reply('Welcome!'));
bot.help((ctx) => ctx.reply('Send me a message and I will echo it back.'));

// Handle incoming messages
bot.on('message', (ctx) => {
  ctx.reply(`You said: ${ctx.message.text}`);
});