Telegraf JS: Library for creating telegram bot using Javascript

npm init --y

npm i --save telegraf

const {Telegraf} = requrie("telegraf")

const bot = new Telegraf("YOUR_BOT_TOKEN")

// When user send /start command
bot.start((ctx) => ctx.reply('Welcome'))

bot.launch();

node .

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

// Replace 'YOUR_BOT_TOKEN' with your Telegram Bot API token
const bot = new Telegraf('YOUR_BOT_TOKEN');

// Middleware function to check if a user has joined a channel
function checkChannelJoin(ctx, next) {
  const channelId = '@YourChannelUsername'; // Replace with your channel's username or ID
  const userId = ctx.from.id;

  // Check if the user is a member of the channel
  bot.telegram.getChatMember(channelId, userId)
    .then((chatMember) => {
      if (chatMember.status === 'member' || chatMember.status === 'creator' || chatMember.status === 'administrator') {
        // User is a member of the channel
        console.log(`User is a member of the channel.`);
        next();
      } else {
        // User is not a member of the channel
        console.log(`User ${userId} is not a member of the channel.`);
        ctx.reply(`
        Please join our channel to access the bot functionality.
        ${channelId}
        `);
      }
    })
    .catch((error) => {
      console.log('Error:', error);
      ctx.reply('Oops! Something went wrong. Please try again later.');
    });
}

// Command handler for '/start' command
bot.command('start', checkChannelJoin, (ctx) => {
  ctx.reply('Welcome to the bot!');
});

// Start the bot
bot.launch();