feat: add task routes, dotenv config, and error handling

app/backend/.env.example

@@ -0,0 +1 @@
+PORT=3000

app/backend/package-lock.json

@@ -8,6 +8,7 @@
       "name": "task-backend",
       "version": "1.0.0",
       "dependencies": {
+        "dotenv": "^17.4.0",
         "express": "^4.21.2"
       }
     },
@@ -156,6 +157,18 @@
         "npm": "1.2.8000 || >= 1.4.16"
       }
     },
+    "node_modules/dotenv": {
+      "version": "17.4.0",
+      "resolved": "https://registry.npmjs.org/dotenv/-/dotenv-17.4.0.tgz",
+      "integrity": "sha512-kCKF62fwtzwYm0IGBNjRUjtJgMfGapII+FslMHIjMR5KTnwEmBmWLDRSnc3XSNP8bNy34tekgQyDT0hr7pERRQ==",
+      "license": "BSD-2-Clause",
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://dotenvx.com"
+      }
+    },
     "node_modules/dunder-proto": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/dunder-proto/-/dunder-proto-1.0.1.tgz",
@@ -559,9 +572,9 @@
       }
     },
     "node_modules/path-to-regexp": {
-      "version": "0.1.12",
-      "resolved": "https://registry.npmjs.org/path-to-regexp/-/path-to-regexp-0.1.12.tgz",
-      "integrity": "sha512-RA1GjUVMnvYFxuqovrEqZoxxW5NUZqbwKtYz/Tt7nXerk0LbLblQmrsgdeOxV5SFHf0UDggjS/bSeOZwt1pmEQ==",
+      "version": "0.1.13",
+      "resolved": "https://registry.npmjs.org/path-to-regexp/-/path-to-regexp-0.1.13.tgz",
+      "integrity": "sha512-A/AGNMFN3c8bOlvV9RreMdrv7jsmF9XIfDeCd87+I8RNg6s78BhJxMu69NEMHBSJFxKidViTEdruRwEk/WIKqA==",
       "license": "MIT"
     },
     "node_modules/proxy-addr": {

app/backend/package.json

@@ -4,9 +4,11 @@
   "description": "Backend API for scalable task platform",
   "main": "server.js",
   "scripts": {
-    "start": "node server.js"
+    "start": "node server.js",
+    "dev": "node --watch server.js"
   },
   "dependencies": {
+    "dotenv": "^17.4.0",
     "express": "^4.21.2"
   }
 }

app/backend/server.js

@@ -1,16 +1,61 @@
+require("dotenv").config();
 const express = require("express");
 
 const app = express();
-const PORT = 3000;
+const PORT = process.env.PORT || 3000;
 
 app.use(express.json());
 
+// In-memory task store
+let tasks = [];
+let nextId = 1;
+
+// Routes
 app.get("/", (req, res) => {
-  res.send("Task backend is running");
+  res.json({ message: "Task API is running", version: "1.0.0" });
 });
 
 app.get("/health", (req, res) => {
-  res.status(200).json({ status: "healthy" });
+  res.status(200).json({ status: "healthy", uptime: process.uptime() });
+});
+
+app.get("/tasks", (req, res) => {
+  res.json(tasks);
+});
+
+app.post("/tasks", (req, res) => {
+  const { title } = req.body;
+  if (!title) {
+    return res.status(400).json({ error: "Title is required" });
+  }
+  const task = { id: nextId++, title, completed: false, createdAt: new Date() };
+  tasks.push(task);
+  res.status(201).json(task);
+});
+
+app.patch("/tasks/:id", (req, res) => {
+  const task = tasks.find((t) => t.id === parseInt(req.params.id));
+  if (!task) return res.status(404).json({ error: "Task not found" });
+  task.completed = !task.completed;
+  res.json(task);
+});
+
+app.delete("/tasks/:id", (req, res) => {
+  const index = tasks.findIndex((t) => t.id === parseInt(req.params.id));
+  if (index === -1) return res.status(404).json({ error: "Task not found" });
+  tasks.splice(index, 1);
+  res.status(204).send();
+});
+
+// 404 handler
+app.use((req, res) => {
+  res.status(404).json({ error: "Route not found" });
+});
+
+// Global error handler
+app.use((err, req, res, next) => {
+  console.error(err.stack);
+  res.status(500).json({ error: "Internal server error" });
 });
 
 app.listen(PORT, () => {