This is a straightforward Express.js server that implements CRUD (Create, Read, Update, Delete) operations for a product resource. The server includes basic authentication for specific routes.

• Node.js installed
• npm (Node Package Manager) installed
• POSTMAN installed

• index.js: Main entry point for the Express application.
• data.json: JSON file containing sample item for products.
• README.md: Project documentation.

• GET /demo: A sample route demonstrating basic authentication using middleware.
• POST /products: Create a new product.
• GET /products: Retrieve all products.
• GET /products/:id: Retrieve a product by ID.
• PUT /products/:id: Update a product by ID.
• PATCH /products/:id: Partially update a product by ID.
• DELETE /products/:id: Delete a product by ID.

auth: Custom authentication middleware that checks the password in the request body. Used to secure the /demo route.