Backend Exercise

It’s time to build! In this exercise, you will complete the mocked API for the Task Manager and create a comprehensive test suite in Postman.

Objective

1. Implement the missing PATCH (Update) and DELETE endpoints in your Hono application.
2. Add a custom middleware that logs the request method and URL.
3. Create a Postman Collection that tests every endpoint.

Part 1: API Implementation

Open your src/index.ts (or wherever your Hono app is).

Task 1: Middleware

Create a middleware that logs: [METHOD] URL - Timestamp.

Task 2: Update Task (PATCH)

Implement PATCH /api/tasks/:id.

• It should accept a JSON body with title, description, or status.
• Update the task in your mock array.
• Return the updated task.
• Return 404 if the task doesn’t exist.

Task 3: Delete Task (DELETE)

Implement DELETE /api/tasks/:id.

• Remove the task from the array.
• Return a success message (e.g., { message: "Deleted" }).
• Return 404 if the task doesn’t exist.

Part 2: Postman Collection

Create a collection named “Task Manager Exercise” with the following requests:

1. Get All Tasks (GET {{baseUrl}}/api/tasks)
2. Create Task (POST {{baseUrl}}/api/tasks)
   • Body: {"title": "Test Task", "description": "Testing Postman"}
3. Get Single Task (GET {{baseUrl}}/api/tasks/:id)
   • Use a real ID from the previous response.
4. Update Task (PATCH {{baseUrl}}/api/tasks/:id)
   • Body: {"status": "in_progress"}
5. Delete Task (DELETE {{baseUrl}}/api/tasks/:id)

Hint

💡 Click for Code Hints

Middleware:

app.use("*", async (c, next) => {
  console.log(`[${c.req.method}] ${c.req.url} - ${new Date()}`);
  await next();
});

Delete Endpoint:

app.delete("/api/tasks/:id", (c) => {
  const id = c.req.param("id");
  const index = tasks.findIndex((t) => t.id === id);

  if (index === -1) return c.json({ error: "Not found" }, 404);

  tasks.splice(index, 1);
  return c.json({ message: "Deleted" });
});

Verification

1. Start your server (bun run dev).
2. Open Postman.
3. Run your “Create Task” request.
4. Copy the ID of the new task.
5. Use that ID to run “Update Task” and verify the status changes.
6. Run “Delete Task” with that ID.
7. Run “Get Single Task” with that ID - it should now fail (404).

Next Steps

Congratulations! You have built a functional (mocked) REST API and verified it with industry-standard tools. In the next module, we will connect this to a real database using Drizzle ORM.