Bot Telegram yang dipasang di zeit.co/now. Lihat https://www.rizaumami.com/2017/09/membuat-bot-telegram-selamat-datang.html.

nobot.js

const escapeHtml = require('escape-html')
const Telegraf = require('telegraf')
const bot = new Telegraf(process.env.BOT_TOKEN)

function getName(user) {
  let name = `<b>${escapeHtml(user.first_name)}</b>`
  if (user.last_name) name += ` <b>${escapeHtml(user.last_name)}</b>`
  if (user.username) name += ` (@${user.username})`
  name += ` [<code>${user.id}</code>]`

  return name
}

bot.on('message', (ctx) => {
  if (ctx.updateSubTypes == 'new_chat_members') {
    ctx.replyWithHTML(
      `Hai ${getName(ctx.message.new_chat_member)}, selamat datang di <b>${ctx.chat.title}</b>!`, {
        'reply_to_message_id': ctx.message.message_id,
        'reply_markup': {
          'inline_keyboard': [
            [
              {
                text: 'Harap baca ini dulu',
                url: 'http://telegraf.js.org'
              }
            ]
          ]
        }
      }
    )
  }
})

const secret = Math.random().toString(36).slice(2)
bot.telegram.setWebhook(`${process.env.NOW_URL}/${secret}`)
bot.startWebhook(`/${secret}`, null, process.env.PORT, process.env.HOST)