▎🚀 Let's Build: Project 2 (Tiny Link Bot)

Here is the complete code and guide for the URL Shortener Bot. This is purely for Cloudflare Workers (no Python, no Vercel).

▎1. The Code (worker.js)

You only need this one file.

export default {
  async fetch(request, env, ctx) {
    // 1. Handle the Webhook (POST request from Telegram)
    if (request.method === "POST") {
      const payload = await request.json();
      
      // Check if it's a message
      if (payload.message && payload.message.text) {
        const chatId = payload.message.chat.id;
        const text = payload.message.text;

        // If command is /start
        if (text === "/start") {
          await sendTelegramMessage(chatId, "🔗 Send me any long URL, and I will shorten it!", env.BOT_TOKEN);
        } 
        // If it looks like a URL (basic check)
        else if (text.startsWith("http")) {
          // Call the Shortener API
          const shortUrl = await shortenUrl(text);
          await sendTelegramMessage(chatId, ✅ Here is your short link:\n${shortUrl}, env.BOT_TOKEN);
        } 
        else {
          await sendTelegramMessage(chatId, "⚠️ That doesn't look like a link. Send a URL starting with http...", env.BOT_TOKEN);
        }
      }
      return new Response("OK");
    }
    
    // 2. Simple landing page for the browser
    return new Response("Bot is running on Cloudflare Workers! 🚀");
  },
};

// --- Helper Functions ---

// Function to send message to Telegram
async function sendTelegramMessage(chatId, text, token) {
  const url = https://api.telegram.org/bot${token}/sendMessage;
  await fetch(url, {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({ chat_id: chatId, text: text }),
  });
}

// Function to shorten URL using is.gd (Free, no API key needed)
async function shortenUrl(longUrl) {
  const apiUrl = https://is.gd/create.php?format=json&url=${encodeURIComponent(longUrl)};
  const response = await fetch(apiUrl);
  const data = await response.json();
  
  if (data.shorturl) {
    return data.shorturl;
  } else {
    return "Error shortening link.";
  }
}

▎2. Deployment Guide

You can copy this into your channel. It explains how to deploy using the browser (easiest for beginners).

▎☁️ Project: Cloudflare Link Shortener Bot

Run a bot 100% free on Cloudflare Workers. No servers, just one file!

▎📂 Step 1: Create the Worker

1. Go to dash.cloudflare.com and sign up/login.
2. Click Compute & AI -> Workers Pages -> Create Application -> Start with hello world.
3. Click Create Worker -> Deploy.
4. Now click Edit Code.

▎📝 Step 2: The Code

1. Delete everything in the left side editor.
2. Paste the code above.

3. Click Save and Deploy (top right).

▎🔑 Step 3: Add Bot Token

1. Go back to your Worker's dashboard (click the back arrow).
2. Go to Settings -> Variables.
3. Click Add Variable.
– Name: BOT_TOKEN
– Value: (Paste your Token from @BotFather)
– Click Deploy (or Save).

▎🔗 Step 4: Connect Webhook

Copy your Worker URL (e.g., https://crimson-rain.user.workers.dev).
Replace the details in this link and open it in your browser:

https://api.telegram.org/bot<YOUR_TOKEN>/setWebhook?url=<YOUR_WORKER_URL>

✅ Done! Send a link to your bot to test it.

#EzyBot #Cloudflare #JavaScript