Advanced Node.js API Handling: PUT, DELETE, and Array Methods Explained | Part - 4 | Tamil

👉 What You'll Learn:

🔹 Setting up a basic server with the http module.
🔹 Adding routes like /users, /users/:id, etc.
🔹 Using Postman to test PUT and DELETE requests with ease.

🔹 PUT Request – Update existing data in a JSON file.
🔹 DELETE Request – Remove a specific item based on criteria like ID or name.
🔹 Parsing and handling request body data with events and buffers.

📝 Working with Array Methods for Data Manipulation:
🔹 filter() – Return a new array with only matching elements (e.g., users by age or role).
🔹 find() – Retrieve a single object from an array based on a condition (e.g., user by ID).
🔹 findIndex() – Locate the position of an item for update or delete operations.
🔹 slice() – Return a portion of the array, useful for pagination or previews.

📝 Reading & Writing JSON with fs module:
🔹 Ensure data integrity with proper error handling.

🛠 Practical Example – /users Endpoint:
🔹 PUT /users/:id: Find user by ID, update info from request body, save changes.
🔹 Use array methods (find, findIndex, etc.) to manage user data cleanly.
🔹 BONUS: Add filtering and pagination using query parameters with filter and slice.

🔍 Testing with Postman:
🔹 Send different types of data (JSON) for PUT and DELETE.
🔹 Verify response messages, data changes, and error cases.
🔹 Use console logs to debug and visualize server actions.

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