API created for Dashboard Data

Learnings.md

@@ -2,4 +2,29 @@
 
 -->Make sure to include type:module
 
--->correct file name extensions   i.e .js .ts etc
+-->correct file name extensions   i.e .js .ts etc
+
+
+-->🔥 Real backend example
+❌ Without Promise.all (slow)
+const user = await User.findById(id);
+const orders = await Order.find({ userId: id });
+const payments = await Payment.find({ userId: id });
+
+👉 Runs one after another (sequential)
+
+✅ With Promise.all (fast)
+const [user, orders, payments] = await Promise.all([
+    User.findById(id),
+    Order.find({ userId: id }),
+    Payment.find({ userId: id })
+]);
+
+👉 Runs all queries together (parallel)
+
+⚡ Performance gain
+Sequential → takes sum of all times
+Parallel → takes max of all times
+
+
+-->

server/controllers/dashboardController.js

@@ -0,0 +1,68 @@
+import { DEPARTMENTS } from "../constants/departments.js";
+import Attendance from "../models/Attendance.js"
+import Employee from "../models/Employee.js"
+import LeaveApplication from "../models/LeaveApplication.js";
+
+
+//Get dashboard for employee and admin
+//GET /api/dashboard
+export const getDashboard = async (req, res) => {
+    try {
+
+        const session = req.session;
+
+        if (session.role === "ADMIN") {
+            const [totalEmployees, todayAttendance, pendingLeaves] = await
+                Promise.all([
+                    Employee.countDocuments({ isDeleted: { $ne: true } }),
+                    Attendance.countDocuments({
+                        date: {
+                            $gte: new Date(new Date().setHours(0, 0, 0, 0)),
+                            $lt: new Date(new Date().setHours(0, 0, 0, 0)),
+                        }
+                    }),
+                    LeaveApplication.countDocuments({ status: "PENDING" })
+                ]);
+
+            return res.json({
+                role: "ADMIN",
+                totalEmployees,
+                totalDepartments: DEPARTMENTS.length,
+                todayAttendance,
+                pendingLeaves,
+            });
+        } else {
+            const employee = await Employee.findOne({ userId: session.userId }).lean();
+
+            if (!employee)
+                return res.status(404).json({ error: "Employee not found" });
+
+            const [currentMonthAttendance, pendingLeaves, latestPayslip] = await Promise.all([
+                Attendance.countDocuments({
+                    employeeId: employee._id,
+                    date: {
+                        $gte: new Date(today.getFullYear(), today.getMonth(), today.getDate(), 1),
+                        $lt: new Date(today.getFullYear(), today.getMonth() + 1, 1),
+                    }
+                }),
+
+                LeaveApplication.countDocuments({
+                    employeeId: employee._id,
+                    status: "PENDING",
+                }),
+                Payslip.findOne({ employeeId: employee._id }).sort({ createdAt: -1 }).lean()
+            ])
+
+            return res.json({
+                role: "EMPLOYEE",
+                employee: { ...employee, id: employee._id.toString() },
+                currentMonthAttendance,
+                pendingLeaves,
+                latestPayslip: latestPayslip ? { ...latestPayslip, id: latestPayslip._id.toString() } : null,
+            });
+        }
+    } catch (error) {
+        console.error("Dashbaord error:", error);
+        return res.status(500).json({ error: "Failed" });
+    }
+}

server/package.json

@@ -13,6 +13,7 @@
   "description": "",
   "dependencies": {
     "bcrypt": "^6.0.0",
+    "bcryptjs": "^3.0.3",
     "cors": "^2.8.6",
     "dotenv": "^17.4.2",
     "express": "^5.2.1",
@@ -23,4 +24,4 @@
   "devDependencies": {
     "nodemon": "^3.1.14"
   }
-}
+}

server/routes/dashboardRoutes.js

@@ -0,0 +1,13 @@
+import { Router } from "express";
+import { protect } from "../middlewares/protect.js";
+import { getDashboard } from "../controllers/dashboardController.js";
+
+
+
+const dashboardRouter = Router();
+
+
+dashboardRouter.get("/", protect, getDashboard);
+
+
+export default dashboardRouter;

server/server.js

@@ -10,7 +10,7 @@ import profileRouter from "./routes/profileRoutes.js";
 import attendanceRouter from "./routes/AttendanceRoutes.js";
 import leaveRouter from "./routes/leaveRoutes.js";
 import paySlipRouter from "./routes/paySlipsRoutes.js";
-
+import dashboardRouter from "./routes/dashboardRoutes.js";
 
 const app = express()
 
@@ -34,6 +34,7 @@ app.use('/api/profile', profileRouter);
 app.use('/api/attendance', attendanceRouter);
 app.use('/api/leave', leaveRouter);
 app.use('/api/payslip', paySlipRouter);
+app.use('/api/dashboard', dashboardRouter);
 
 
 await connectDb();