Webhook example with bodyParser and express

node.js

'use strict';

const express = require('express');
const bodyParser = require('body-parser');
const app = express().use(bodyParser.json()); // creates http server
const token = 'YOUR_TOKEN_HERE'; // type here your verification token

app.get('/', (req, res) => {
    // check if verification token is correct
    if (req.query.token !== token) {
        return res.sendStatus(401);
    }

    // return challenge
    return res.end(req.query.challenge);
});

app.post('/', (req, res) => {
    // check if verification token is correct
    if (req.query.token !== token) {
        return res.sendStatus(401);
    }
  
    // print request body
	console.log(req.body);

    // return responses and actions
    const data = {
		// return responses
        responses: [
			{
				"type": "cards",
				"elements": [
				  {
					"title": "Event One",
					"subtitle": "foo bar baz",
					"imageUrl": "https://via.placeholder.com/300x220",
					"buttons": [
					  {
						"type": "postback",
						"title": "foo",
						"value": "bar"
					  },
					  {
						"type": "postback",
						"title": "baz",
						"value": "qux"
					  }
					]
				  },
				  {
					"title": "Event Two",
					"subtitle": "foo bar baz",
					"imageUrl": "https://via.placeholder.com/300x220",
					"buttons": [
					  {
						"type": "postback",
						"title": "foo",
						"value": "bar"
					  },
					  {
						"type": "postback",
						"title": "baz",
						"value": "qux"
					  }
					]
				  },
				  {
					"title": "Event Three",
					"subtitle": "foo bar baz",
					"imageUrl": "https://via.placeholder.com/300x220",
					"buttons": [
					  {
						"type": "postback",
						"title": "foo",
						"value": "bar"
					  },
					  {
						"type": "postback",
						"title": "baz",
						"value": "qux"
					  }
					]
				  }
				]
			}
		],

		// return attributes
		attributes: {
			attribute: 'value'
		}
    };

    res.json(data);
});

app.listen(3000, () => console.log('[ChatBot] Webhook is listening'));