To-Do service API

Update a Task Using PATCH

This tutorial shows you how to update an existing task using the PATCH method of the To-Do API. This is helpful when you want to update just one or two fields of a task — like marking it complete or changing the title — without sending the entire object.

Goal

Update an existing task’s title or completed status using the PATCH /tasks/{taskId} endpoint.

Prerequisites

Before you begin, make sure you have:

• A running instance of the To-Do API on localhost:3000
• At least one task already created (so you have a task ID)
• A tool like curl or Postman

---

Example 1 – Using curl

curl -X PATCH http://localhost:3000/tasks/1 \
  -H "Content-Type: application/json" \
  -d "{\"completed\": true}"

### Expected Response

```json
{
  "id": 1,
  "title": "Sample Task",
  "completed": true
}

Example 2 – Using Postman

1. Open Postman and select the PATCH method.
2. Enter the request URL: http://localhost:3000/tasks/1
3. Go to the Headers tab and add:
   • Key: Content-Type
   • Value: application/json
4. Go to the Body tab, select raw, and choose JSON as the format.
5. Enter the following body:

{
  "title": "Updated Task Title"
}

###Expected Response

{
  "id": 1,
  "title": "Updated Task Title",
  "completed": false
}

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