Essential backend functionality, including logins.

api/models/bookModel.js

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+'use strict';
+const mongoose = require('mongoose');
+const Schema = mongoose.Schema;
+
+const BookSchema = new Schema({
+  title: {
+    type: String,
+    required: 'Book title missing'
+  },
+  publication_date: {
+    type: Date,
+    default: Date(0)
+  },
+  quantity: {
+    type: Number,
+    default: 1
+  },
+  amount_loaned: {
+    type: Number,
+    default: 0
+  },
+  isbn13: {
+    type: String,
+    required: 'Book ISBN-13 missing'
+  }
+});
+
+module.exports = mongoose.model('Book', BookSchema);