telegraf-bot-vercel-serverless

A bare-bones Node.js Telegram bot template.

📣 Built with Telegraf
⚡ Spun up using Fastify
🚀 Hosted on Vercel as a serverless function

Deploy to Vercel

When prompted to provide the BOT_TOKEN environment variable, paste the token provided by @BotFather upon creation of the new bot.

How it works

├── api
│   └── serverless.js
├── src
│   ├── bot.js
│   └── webhook.js
└── vercel.json

1. vercel.json - Funnels requests on any path (/(.*)) to the handler function exported by /api/serverless.js.
2. /api/serverless.js - Creates a Fastify app with two functionalities (described below): bot and webhook. It then exports a function accepting requests from Vercel and routes them to the Fastify app.
3. /src/bot.js - Creates a Telegraf bot object, adds its behavior, and attaches the bot object to the app so webhook can access it
4. /src/webhook.js - Routes POST requests on the secret path to the webhook callback obtained from the Telegraf bot. This essentially hooks the webhook requests to the bot's behavior.