Discussion
January 19, 2023
“Principles for Policy and Standards Development”
January 19, 2023

Intro to Scripting

Create a simple Node.js server (Save as w4_firstname_lastname.js) . Create a restful application similar to the one in lesson 4. Document the routing table, and the application you created.Extra: Modify any JavaScript code (or the JScript assignment)  to run from Node.js command lineSubmit your week 4 work in w4_firstname_lastname.txt (Please save the file as a text file and upload the text file here for final review.)A web service is a collection protocols and standards used for exchanging data between applications or systems. Services are written in various programming languages, and running on various platforms. The following table has URI examples on how to call the services.Routing TableSr. No.HTTP MethodURIOperationCRUD1GET/UserService/usersGet list of usersRead2GET/UserService/users/1Get User with Id 1Read3PUT/UserService/users/2Insert User with Id 2Update4POST/UserService/users/2Update User with Id 2Create5DELETE/UserService/users/1Delete User with Id 1DeleteWith ExpressJS, you can easily create a ReStful web services.Here is an example how to create a routing table similar to the one above/*// This application to demo the use of restfull services// This is the core for any MV* pattern// let me know if you have any question// use express server, it must be in the node_modulessave this code as wk4_myserver.js in c:ENTD261to run this code, make sure you are on c:entd261 if not change directory to c:entd261>cd c:entd261C:ENTD261>node wk4_myserver.jsonce the server is running, you will getExpress server listening on port 55555from any browserhttp://localhost:55555/*/// setupvar express=require(“express”);var http=require(“http”);var app=express();// run the serverhttp.createServer(app).listen(55555);console.log(‘Express server listening on port 55555’);// <<< here is the Model, the data storagevar products = [{ id: 0, name: 'watch', description: 'Tell time with this amazing watch', price: 30.00 },{ id: 1, name: 'sandals', description: 'Walk in comfort with these sandals', price: 10.00 },{ id: 2, name: 'sunglasses', description: 'Protect your eyes in style', price: 25.00 }];// http://localhost:55555                             // general route// here is the viewapp.get("/", function(req,res){var msg=""msg += " This is the default page "msg += " use the following "msg += " http://localhost:55555/hello "msg += " http://localhost:55555/goodbye "msg += " http://localhost:55555/products "msg += " http://localhost:55555/products/2 "res.send(msg);});// <<< routes = controller// http://localhost:55555/hello                    // welcome  routeapp.get("/hello", function(req,res){res.send("Hello ENTD261 class");});// http://localhost:55555/goodbye                       // good bye routeapp.get("/goodbye", function(req,res){res.send("Thank you ENTD261 class");});// http://localhost:55555/products                       // load and display all productsapp.get('/products', function(req, res) {res.send(JSON.stringify(products));});// http://localhost:55555/products/2                    // load and display product id 2app.get('/products/:id', function(req, res) {if (req.params.id > (products.length – 1) || req.params.id < 0) {res.statusCode = 404;res.end('Not Found');}res.send(JSON.stringify(products[req.params.id]));});

 
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