tinman_webhook_1.js

const express = require('express')
const bodyParser = require('body-parser')
const jsonParser = bodyParser.json()
const axios = require('axios');

const app = express()

app.post('/webhook', jsonParser, (req, res) => {
   console.log(req.body)
   for(const event of req.body.events) {
    console.log(event.type)
    switch(event.type) {
      case "message":
        console.log(event.message)
        reply(event.replyToken, `please click the button`)
        break
      case "postback":
        console.log('this event message')
        const datas = event.postback.data.split('&')
        console.log(datas)
        let jobId = null
        let interest = null
        for(data of datas) {
          data = data.split('=')
          if(data[0] === 'jobId') {
            jobId = data[1]
          } else if(data[0] === 'interest') {
            interest = data[1]
          }
        }
        reply(event.replyToken, `jobId = ${jobId}, interest = ${interest}`)
        break
      default:
        break
    }
   }
   res.status(200)
})

app.listen(3000, () => {
  console.log('Start server at port 3000.')
})

const reply = async (replyToken, message) => {
  const params = {
    replyToken,
    messages: [{
        type: 'text', 
        text: message 
    }]
  }
  await axios({
    method: 'post',
    url: 'https://api.line.me/v2/bot/message/reply',
    headers: {
      'Authorization': `Bearer {ACCESS TOKEN}`,
    },
    data: params,
  })
  .catch(function (error) {
    if (error.response) {
      console.log(error.response.data);
      console.log(error.response.status);
      console.log(error.response.headers);
    }
  })
}