router-example.js

const http = require('http')
const books = [
  {id: 1, title: "You Don't Know JS", author: "Kyle Simpson"},
  {id: 2, title: "Sometimes a Great Notion", author: "Ken Kesey"},
  {id: 3, title: "The Teachings of Don Juan", author: "Carlos Casteneda"}
]

// check the url, if it is /books or /books/:id
// check the method, if it is GET, POST, PUT, or DELETE
// depending on the above, we want to send back our response.
const makeServer = (request,response) => {
	if(request.url === "/books") {
		console.log("it was /books")
		if(request.method === "GET") {
			response.writeHead(200,{'Content-Type':'application/json'});
			response.write(JSON.stringify(books));
			response.end();
		}
		if(request.method === "POST") {
			let body = [];
			request.on('data', (chunk) => {
			  body.push(chunk);
			}).on('end', () => {
			  let book = Buffer.concat(body).toString();
			  books.push(book)
			  response.writeHead(200,{'Content-Type':'application/json'});
				response.write(JSON.stringify(books));
				response.end();
			});
		}
	} else {
		let bookId = parseInt(request.url.slice(7))
		if(bookId) {
			if(request.method === "GET") {
				let foundBook;
				books.forEach( book => {
					if(book.id === bookId) {
						foundBook = book;
					}
				})
				if (foundBook) {
					response.writeHead(200,{'Content-Type':'application/json'});
					response.write(JSON.stringify(foundBook));
					response.end();
				} else {
					response.writeHead(404,{'Content-Type':'application/json'});
					response.write("Not found");
					response.end();
				}
			} else if (request.method === "DELETE") {
				let foundBook;
				let index;
				books.forEach( (book, idx) => {
					if(book.id === bookId) {
						foundBook = book;
						index = idx;
					}
				})
				if (foundBook) {
					books.splice(index, 1)
					response.writeHead(200,{'Content-Type':'application/json'});
					response.end();
				} else {
					response.writeHead(404,{'Content-Type':'application/json'});
					response.write("Not found");
					response.end();
				}
			} else if (request.method === "PUT" || request.method === "PATCH") {
				let body = [];
				request.on('data', (chunk) => {
				  body.push(chunk);
				}).on('end', () => {
				  let newBookData = Buffer.concat(body).toString();
				});

				let foundBook;
				books.forEach( (book, idx) => {
					if(book.id === bookId) {
						foundBook = book;
					}
				})
				if (foundBook) {
					for(key in newBookData) {
						foundBook[key] = newBookData[key]
					}

					response.writeHead(200,{'Content-Type':'application/json'});
					response.write(JSON.stringify(foundBook));
					response.end();
				} else {
					response.writeHead(404,{'Content-Type':'application/json'});
					response.write("Not found");
					response.end();
				}
			}
			//deal with get one, edit, and delete
		} else {
			response.writeHead(404,{'Content-Type':'application/json'});
			response.write("Not found");
			response.end();
		}
	} 
}


      
const server = http.createServer(makeServer);

server.listen(3000,()=>{
  console.log('Node server created at port 3000')
})