Why Vercel Fails with Telegram Bots — And How I Fixed It

Telegram bots are powerful tools — but deploying them can be tricky, especially on platforms like Vercel. In this blog, I’ll walk you through the exact problem I faced, why it happened, what background workers are, and how I solved it using a smarter hosting approach.


🚨 1. The Problem with Vercel and Telegram Bots

🧠 A. How Vercel Works

  • Vercel is optimized for serverless web applications like Next.js, React, and static sites.

  • It runs short-lived serverless functions that start on HTTP requests and stop after a response.

  • Designed for websites and APIs — not long-running scripts.

🤖 B. How Telegram Bots Work

  • Bots typically use long polling — keeping a connection open with Telegram to wait for messages.

  • Requires a 24/7 running process — something Vercel doesn't allow.

💥 C. The Core Problem

  • Vercel kills long-running processes — including your Telegram bot.

  • Symptoms you may encounter:

    • The bot doesn't respond at all.

    • Crashes after a few seconds.

    • Error messages like:
      "background worker not supported" or
      "no open ports detected."

🧰 2. What is a Background Worker?

A background worker is a continuously running process used for tasks like:

  • Listening for Telegram messages

  • Running CRON jobs

  • Performing background calculations

Unlike web services, background workers don’t depend on HTTP requests.

✅ Supported by platforms like:

  • Render (paid plans)

  • Railway

  • Fly.io

💸 3. Why Free Hosting Plans Fail

PlatformFree PlanBackground Worker SupportResult
Vercel✅ Yes❌ No❌ Bot fails to run
Render✅ Yes❌ (Web only)⚠️ Workaround needed
Render (Paid)💰 Yes✅ Yes✅ Best Option
Railway✅ Yes✅ Yes✅ Recommended
Fly.io✅ Yes✅ Yes✅ Recommended🛠️

 4. How I Fixed It

✅ A. Switched to a Host That Supports Background Workers

I moved the bot to Render (alternatively Railway or Fly.io) to run the polling logic 24/7.

🧪 B. Render (Free Plan) Hack: Add a Minimal HTTP Server

Since Render free plan only supports web services, I added a tiny Express.js server like this:

js
const express = require('express');
const app = express();
app.get('/', (req, res) => res.send('Bot is running'));
app.listen(process.env.PORT || 3000);

This keeps the service alive by “fooling” Render into treating the bot like a web app.

💰 C. Upgraded to a Paid Plan (Optional)

  • Upgrading on Render allowed me to run the bot script as a background worker directly.

  • No HTTP server needed — just run node bot.js.

🪜 5. My Step-by-Step Journey

  1. 🚫 Tried Vercel

    • Bot crashed or timed out.

    • Learned it doesn't support long-running scripts.

  2. 💡 Discovered Background Workers

    • Required for polling-based bots.

  3. 🔄 Moved to Render

    • On free plan: added minimal HTTP server.

    • Later upgraded to use background worker properly.

  4. 🧪 Tested on Railway and Fly.io

    • Both support background workers well — even on free tiers (with usage limits).

📌 6. Key Takeaways

  • Vercel ≠ good for polling-based bots

  • Polling bots need background workers, not serverless functions.

  • Render free plan hack: Use an Express server to keep the app alive.

  • Railway/Fly.io = easier and cleaner setup.

📚 Useful References



Comments

Post a Comment

Popular posts from this blog

How to Upload Your Local Project to GitHub Properly

Image
How to Upload Your Local Project to GitHub – Step-by-Step Guide  📂 How I Learned the Right Way to Upload a Project to GitHub (From My College Mistake) 🏫 The College Phase: Uploading Projects to GitHub… the Wrong Way When I was in college, like many students, I worked on small development projects — web apps, Java-based tools, and mini full-stack apps. Back then, seniors and recruiters would often ask: “Do you have a GitHub link for your projects?” So I did what most beginners do: I created a new repository on GitHub. Then, I clicked Upload Files . I dragged and dropped my entire project folder . And hit “Commit”. Done, right? Well... not exactly . ❌ Why That Was the Wrong Way At first glance, it looked fine — my code was there on GitHub. But: There was no commit history Git wasn’t tracking actual changes over time No .gitignore file — so unnecessary files were also uploaded If I cloned it somewhere else, setup was messy Worse, I coul...
Read more

YouTube Videos, Translation, AI Tools Aur Hindi Mein Dekhne Ka Experience

  YouTube Videos, Translation, AI Tools Aur Hindi Mein Dekhne Ka Experience  Introduction Aaj kal har koi YouTube pe videos dekhta hai—tutorials, funny clips, interviews, ya podcasts. Lekin jab content English mein ho aur aapko Hindi mein samajhna ho, toh kya options hain? Language barrier content enjoy karne mein bada hurdle ho sakta hai, especially jab video English mein ho aur aapko Hindi mein samajhna ho ya Hindi audio chahiye. Is blog mein hum yehi samjhenge ki aap English YouTube video ko Hindi mein kaise dekh sakte hain ya sun sakte hain, kaun-kaun se AI tools available hain, aur kya limitations hain real life usage mein. YouTube Video Dekhne Mein Language Problem YouTube duniya ka sabse bada video platform hai—yahan har topic, har language, har audience ke liye kuch na kuch available hai. Lekin jab: Video English ya kisi aur language mein ho https://unhealthyirreparable.com/cit2c8ca?key=7566cfdb82de49ba4912160b26b7621f User ko Hindi mein content ch...
Read more

How to Build a Telegram Bot Using Node.js – Step-by-Step Guide

Image
How to Build a Telegram Bot Using Node.js – Step-by-Step Guide   Creating your own Telegram bot is easier than you think. In this guide, I’ll walk you through the complete process — from setting up your bot with BotFather , writing the bot using Node.js , to deploying it live 24/7 using Render . username: tns_server_error_bot 🧭 Step 1: Create a Bot on Telegram Using BotFather Open Telegram app In the search bar, type: BotFather Start the chat and type /start Then type /newbot and follow the steps: Choose a name for your bot (e.g., TNS Server Bot ) Choose a username that must end with _bot (e.g., tns_server_error_bot ) Copy the HTTP API token that BotFather gives you — we’ll use this later in our .env file. 💻 Step 2: Set Up Y our Project in VS Code (or Cursor) Open your preferred IDE (I used Cursor but you can use VS Code) Create a new folder for your project: mkdir tns_server_error_bot cd tns_server_error_bot Initiali...
Read more