app.js

//jshint esversion: 6

const express = require('express');
const bodyParser = require('body-parser');
const request = require('request');
const https = require('https');

const app = express();

app.use(express.static("public"))
app.use(bodyParser.urlencoded({ extended: true }))

app.get('/', function (req, res) {
    res.sendFile(__dirname + "/signup.html")
})

app.post('/', function (req, res)
{
    var fname = req.body.firstName;
    var lname = req.body.lastName;
    var email = req.body.email;

    var data = {
        members: [
            {
                email_address: email,
                status: "subscribed",
                merge_fields: {
                    FNAME: fname,
                    LNAME: lname
                }
            }
        ]
    }

    var jsonData = JSON.stringify(data);

    const url = "https://us20.api.mailchimp.com/3.0/lists/5a7aaf2b25"
    const options = {
        method: "POST",
        auth: "sarthak-19:7ce305512f46ba33784c2dca754f585e-us20"
    }
    const request = https.request(url, options, function (response) 
    {   
        if(response.statusCode===200)
        {
            res.sendFile(__dirname+"/success.html");
        }
        else
        {
            res.sendFile(__dirname+"/failure.html");
        }
        response.on("data", function (data) {
        console.log(JSON.parse(data));
        })
    })
    request.write(jsonData);
    request.end();

    // console.log(fname, lname, email)
});

app.post("/failure",function(req,res){
    res.redirect("/");
});

app.listen(process.env.PORT || 3000, function () {
    console.log('Listening on 3000')
});

//api key
//

// list id
// 5a7aaf2b25