Modify back - books.js

backend/routes/books.js

@@ -3,6 +3,7 @@ var router = express.Router();
 var books = require('../data/books.json');
 var fs = require('fs');
 var path = require('path');
+var User = require('../models/user');
 
 router.get('/', function(req, res) {
     console.log("=======Book Index=======");