Based on this tutorial (except the exposing the localhost to public part) https://medium.com/linedevth/line-bot-101-447e427d62c7

Line chat bot for verifying fake news! There are two part in total: line messaging API backend using express.js and front end using react.js

1)Clone and run this command

npm install

2)Modify config.json

{
  "port" : "3000",
  "channelAccessToken": "YOUR_CHANNEL_ACCESS_TOKEN",
  "channelSecret": "YOUR_CHANNEL_SECRET"
}

3. Install local tunnel Use localtunnel https://github.com/localtunnel/localtunnel to expose your local url using the startlt.sh script so LINE message API would be able to communicate with the server run this to install local tunnel

npm install localtunnel

1. Start express server on port 3000 using

npm start 

2. Expose the server to https://owlery.localtunnel.me using this command (the URL can be changed in the startlt.sh script)

./startlt