Express Routing Example

index.js

// create a sub-directories called "product" and "products" with filenames like "product{Integer}.html"
//I used two sub dirs just as an example
var express = require("express");
var apiRouter = require("./api_router");
var path = require("path");

var app = express();


app.set("view engine", "ejs");
app.set("views", "views");

app.get("/", function(req, res){
        res.render("index", {
                message: "rohan dskfnsldk "
        });
        console.log(req)
});

//This function shows use of Regular Expressions


app.get(/^\/products\/(\d+)$/, (req, res) =>{
        var pid = parseInt(req.params[0], 10);
        console.log("The customer is asking for product"+pid);
        var fileID = "product" + pid + ".html";
        var filename = path.join(__dirname, "product", fileID);
        res.sendFile(filename);
});

// This shows how to grab parameters from routes.

app.get("/product/:productId", (req, res) => {
        var pid = parseInt(req.params.productId, 10);
        console.log("ProductID = "+pid);
        var fileID = "product" + pid + ".html";
        var filename = path.join(__dirname, "product", fileID);
        res.sendFile(filename);
});

app.listen(3000);