A code snippet to listen and send messages, photos to your telegram bot implemented in Node JS

bot.js

const TelegramBot = require('node-telegram-bot-api');

// replace the value below with the Telegram token you receive from @BotFather
const token = 'YOUR_TELEGRAM_BOT_TOKEN';

// Create a bot that uses 'polling' to fetch new updates
const bot = new TelegramBot(token, {polling: true});


// Listen for any kind of message. There are different kinds of
// messages.
bot.on('message', (msg) => {
  const chatId = msg.chat.id;

  console.log(msg);
  // send a message to the chat acknowledging receipt of their message
  const text = msg.text;
  if(text.includes('picture') || text.includes('image')){
    const imgUrl = "https://picsum.photos/500/700";
    bot.sendPhoto(chatId,imgUrl);
  }else{
    bot.sendMessage(chatId, 'Received your message:'+text);
  }
});