Serverless Responsive LineBot builds on Heroku

A serverless responsive line-bot builds on Heroku

Requirements

• Node.js 4 or higher

Documents

• Heroku create app
• Line Bot API
• Line Bot SDK Nodejs
• Express
• request-promise
• ngrok

Getting Start

Install

Make a directory of linebot

mkdir line-bot-echo
cd line-bot-echo

Build dependencies Using npm:

npm init

Install dependencies

npm install @line/bot-sdk --save
npm install express --save
npm install request --save
npm install request-promise --save

Input CHANNELACCESSTOKEN and CHANNELSECRET in echo.js Or you can set in heroku env

const defaultAccessToken = 'CHANNEL_ACCESS_TOKEN';
const defaultSecret = 'CHANNEL_SECRET';

Create a Procfile

echo web: node echo.js >> Procfile

Deploy

Deploy to heroku using git

git init
git add .
git commit -m "First echo."

Create heroku app and deploy

heroku create line-bot-echo-demo
git push heroku master

Set env

heroku config:set CHANNEL_ACCESS_TOKEN=your_channel_access_token
heroku config:set CHANNEL_SECRET=your_channel_secret

Start your application

heroku ps:scale web=1

Copy heroku app url to line-bot webhook

https://line-bot-echo-demo.herokuapp.com/webhook

Done!

View logs

heroku logs

Demo locally with ngrok

1. Simply run echo.js

node echo.js

• Open another terminal and run ngrok

./ngrok http 3000

2. Using heroku local. You need to configure CHANNELACCESSTOKEN and CHANNELSECRET in .env

• Copy Heroku config vars to your local .env file

heroku config:get CHANNEL_ACCESS_TOKEN CHANNEL_SECRET -s  >> .env

• Locally start heroku app

heroku local

• Open another terminal and start ngrok with the port heroku local open

./ngrok http ${port}