https://www.rizaumami.com/2017/11/membuat-bot-inline-telegram.html

parsebot.js

const Telegraf = require('telegraf')
const bot = new Telegraf(process.env.BOT_TOKEN)

function unescapeHtml(str){
  const map = {
    amp: '&',
    lt: '<',
    le: '≤',
    gt: '>',
    ge: '≥',
    quot: '"',
    '#039': "'"
  }
  return str.replace(/&([^;]+);/g, (m, c) => map[c]|| '')
}

function strikethrough(str){
  return str.replace(/./g, chr => {
    return chr + '\u0336';
  });
}

bot.on('inline_query', ctx => {
  let results = []
  if (ctx.inlineQuery.query) {
    const text = ctx.inlineQuery.query.replace(/<br\/>/g, '\n')
    results = [
      {
        type: 'article',
        id: `bold_${ctx.inlineQuery.id}`,
        title: 'Bold',
        input_message_content: {
          message_text: `<b>${text}</b>`,
          parse_mode: 'HTML'
        },
        description: 'The text will be bolded',
        thumb_url: 'https://i.imgur.com/90jd2L8.png'
      },
      {
        type: 'article',
        id: `italic_${ctx.inlineQuery.id}`,
        title: 'Italic',
        input_message_content: {
          message_text: `<i>${text}</i>`,
          parse_mode: 'HTML'
        },
        description: 'The text will be italized',
        thumb_url: 'https://i.imgur.com/3FeoOWE.png'
      },
      {
        type: 'article',
        id: `mono_${ctx.inlineQuery.id}`,
        title: 'Monospace',
        input_message_content: {
          message_text: `<code>${text}</code>`,
          parse_mode: 'HTML'
        },
        description: 'The text will be monospaced',
        thumb_url: 'https://i.imgur.com/s7ctUP8.png'
      },
      {
        type: 'article',
        id: `st_${ctx.inlineQuery.id}`,
        title: 'Strikethrough',
        input_message_content: {
          message_text: `${strikethrough(text)}`,
        },
        description: 'The text will be striked trough',
        thumb_url: 'https://i.imgur.com/bTc8EHC.png'
      },
      {
        type: 'article',
        id: `custom_${ctx.inlineQuery.id}`,
        title: 'Custom',
        input_message_content: {
          message_text: `${unescapeHtml(text)}`,
          parse_mode: 'HTML',
          disable_web_page_preview: true
        },
        description: 'The text will be sent as custom HTML formatted text',
        thumb_url: 'https://i.imgur.com/7WgtmoK.png'
      }
    ]
  }
  return ctx.answerInlineQuery(results).catch(error => {
    ctx.answerInlineQuery([{
      type: 'article',
      id: `error_${ctx.inlineQuery.id}`,
      title: '⚠️ Error',
      message_text: `${error}`,
      description: `${error}`
    }])
  })
})

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)