Form handler using Mailgun and Netlify Functions

mailgun.js

const { MAILGUN_API_KEY: apiKey, DOMAIN: domain, RECEIVER_MAIL: receiver_mail } = process.env
const mailgun = require('mailgun-js')({ apiKey, domain })

exports.handler = function(event, context, callback) {

    if(event.httpMethod!='POST' || !event.body){
        return callback(new Error('An error occurred!'))
    }

    const data = JSON.parse(event.body)

    if(data.antibot.length>0){
        return callback(new Error('Forbidden access'))
    }

    let messageData = {
        from: data.email,
        to: receiver_mail,
        subject: `Message received from ${data.name}`,
        text: `${data.message}`
    }

    mailgun.messages().send(messageData, function (error) {
        if (error) {
    		return callback(error);
    	} else {
    		return callback(null, {
			    statusCode: 200,
			    body: 'success'
	    	});
    	}
    })

}

const apiKey = process.env.MAILGUN_API_KEY
const domain = process.env.DOMAIN
const receiver_mail = process.env.RECEIVER_MAIL

can be written as such:

const { MAILGUN_API_KEY: apiKey, DOMAIN: domain, RECEIVER_MAIL: receiver_mail } = process.env

const apiKey = process.env.MAILGUN_API_KEY
const domain = process.env.DOMAIN
const receiver_mail = process.env.RECEIVER_MAIL

can be written as such:

const { MAILGUN_API_KEY: apiKey, DOMAIN: domain, RECEIVER_MAIL: receiver_mail } = process.env

indeed!