Post Request Demo

app.js

var express = require("express");
var app = express();
var bodyParser = require("body-parser");

app.set("view engine", "ejs");
app.use(bodyParser.urlencoded({extend:true}));

var friends = ["Yukee", "Mountain", "Xiaobai", "Tony"];

app.get("/",function(req, res){
    res.render("home");
});

app.post("/addfriend", function(req, res){
    var newFriend = req.body.name;
    friends.push(newFriend);
    res.redirect("/friends");
});

app.get("/friends", function(req, res){
    res.render("friends",{friends:friends});
});

app.listen(process.env.PORT, process.env.IP, function(){
    console.log("server started!");
});

friends.ejs

<h1>Friends List</h1>
<% friends.forEach(function(friend){ %>
    <li><%= friend %></li>
<% }); %>

<form action="/addfriend" method="POST">
    <input type="text" name="name" placeholder="name">
    <button>I made a new friend!</button>
    
</form>

home.ejs

<h1>This is the homepage</h1>