Facebook-Messenger-ChatBot

Create Simple Facebook 🤖 ChatBot 🤖 Messenger using Nodejs on Heroku

Build the server

1. Install the Heroku toolbelt from here https://toolbelt.heroku.com to launch, stop and monitor instances. Sign up for free at https://www.heroku.com if you don't have an account yet.

2. Install Node from here https://nodejs.org, this will be the server environment. Then open up Terminal or Command Line Prompt and make sure you've got the very most recent version of npm by installing it again:

   sudo npm install npm -g
   

3. Create a new folder somewhere and let's create a new Node project. Hit Enter to accept the defaults.

   npm init
   

4. Install the additional Node dependencies. Express is for the server, request is for sending out messages and body-parser is to process messages.

   npm install express request body-parser --save
   

5. Create an index.js file in the folder and copy this into it. We will start by authenticating the bot.

   var express = require('express')
   var bodyParser = require('body-parser')
   var request = require('request')
   var app = express()
   
   app.set('port', (process.env.PORT || 5000))
   
   // Process application/x-www-form-urlencoded
   app.use(bodyParser.urlencoded({extended: false}))
   
   // Process application/json
   app.use(bodyParser.json())
   
   // Index route
   app.get('/', function (req, res) {
   	res.send('Hello world, I am a chat bot')
   })
   
   // for Facebook verification
   app.get('/webhook/', function (req, res) {
   	if (req.query['hub.verify_token'] === 'my_voice_is_my_password_verify_me') {
   		res.send(req.query['hub.challenge'])
   	}
   	res.send('Error, wrong token')
   })
   
   // Spin up the server
   app.listen(app.get('port'), function() {
   	console.log('running on port', app.get('port'))
   })