updated some small details

server/api/controllers/controllers.js

@@ -0,0 +1,29 @@
+import mongoose from 'mongoose';
+import User from '../models/User.js';
+// more about response status codes   --->   https://restapitutorial.com/httpstatuscodes.html
+
+export async function getAllUsers(request, response, next) {
+  try {
+    const allUsers = await User.find(); // finds all in 'users' collection
+
+    response.status(200).json(allUsers);
+  } catch (error) {
+    console.log(error);
+    response.status(500).json(error);
+  }
+}
+
+export const createNewUser = async (request, response, next) => {
+  try {
+    let newUser = new User({
+      _id: mongoose.Types.ObjectId(), // _id is set by default, (you can remove this line)
+      name: request.body.userName, // userName === name used on client side
+    });
+    const savedUser = await newUser.save();
+
+    response.status(201).json(savedUser);
+  } catch (error) {
+    console.log(error);
+    response.status(500).json(error);
+  }
+};