First commit

+node_modules
+package-lock.json
+yarn.lock
\ No newline at end of file

+var express = require('express');
+var app = express();
+var bodyParser = require('body-parser');
+app.use(bodyParser.urlencoded({
+    extended: false
+}));
+app.use(bodyParser.json());
+var books = new Array();
+
+
+app.get('/books/:bookId', function (req, res) {
+    var bookId = req.params.bookId;
+    console.log(books[bookId]);
+    res.send(books[bookId]);
+});
+/*
+ * json representation of book object
+{
+	"id" : 2,
+	"name" : "book2",
+	"price" : 2000,
+	"author" : "jin"
+}
+*/
+app.post('/books', function (req, res) {
+    // Create book information
+    books[req.body.id] = [req.body.id, req.body.name, req.body.price, req.body.author];
+    res.send(books[req.body.id]);
+})
+
+app.put('/books', function (req, res) {
+   books[req.body.id] = [req.body.id, req.body.name, req.body.price, req.body.author];
+   res.send(books[req.body.id]);
+})
+app.delete('/books/:bookId', function (req, res) {
+    var index = req.param('bookId');
+    console.log(index);
+    if (index > -1) {
+        books.splice(index, 1);
+    }
+    res.send(req.param('bookId'));
+})
+
+var server = app.listen(80);
+console.log(books);
\ No newline at end of file

+{
+  "dependencies": {
+    "express": "^4.17.1"
+  }
+}