app.js

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

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

    var campgrounds = [
        {name: "Salmon Creek" , image:"https://farm6.staticflickr.com/5181/5641024448_04fefbb64d.jpg"},
        {name: "Granite Hill" , image:"https://farm3.staticflickr.com/2947/15215548990_efc53d32b6.jpg"},
        {name: "Mountain goat's rest" , image:"https://farm8.staticflickr.com/7252/7626464792_3e68c2a6a5.jpg"}
    ];

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

    res.render("campgrounds",{campgrounds:campgrounds});
});

app.post("/campgrounds", function(req,res)
{
    //get data from form and add to array
    var name=req.body.name;
    var image=req.body.image;
    var newCampground={name:name, image:image};
    campgrounds.push(newCampground);
    //redirect back to campgrounds page
    res.redirect("/campgrounds");
});

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

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