In This Blog:

Introduction

Crafting efficient and intuitive RESTful APIs is essential for any business looking to streamline operations and deliver seamless digital experiences. This guide dives into best practices for designing and implementing RESTful APIs in Azure, with clear examples and patterns to ensure scalability, maintainability, and usability. Whether you're managing inventory, handling customer data, or optimizing appointment scheduling, these insights will help you build APIs that meet the demands of modern business needs.

You may also like Microsoft Azure’s video on tips and tricks to build serverless APIs with Azure Functions.

URL Design Best Practices

REST APIs should follow clear URL design patterns that make them intuitive and easy to use. For small businesses, well-designed APIs are crucial for managing everything from inventory systems to customer portals efficiently.

Consider an online retail management system. Well-designed URLs follow these patterns: 

``` 

/api/v1/customers 

/api/v1/customers/{customerId} 

/api/v1/customers/{customerId}/orders 

/api/v1/customers/{customerId}/orders/{orderId} 

```

In a real-world scenario, like a local retail store's inventory management system, the endpoints might be structured as: 

``` 

GET /api/v1/inventory - List all products in stock 

GET /api/v1/inventory/{sku} - Get specific product details 

GET /api/v1/inventory/{sku}/transactions - View product movement history 

POST /api/v1/inventory/{sku}/adjust - Adjust stock levels 



GET /api/v1/sales - List all sales transactions 

GET /api/v1/sales/daily - Get daily sales summary 

POST /api/v1/sales/register - Record new sale 



GET /api/v1/customers - List all customers 

GET /api/v1/customers/{id}/purchases - View customer purchase history 

POST /api/v1/customers/{id}/loyalty - Update loyalty points 

```

For a service-based business, such as a local spa or salon, the API might handle appointment scheduling as follows: 

``` 

GET /api/v1/services - List available services 

GET /api/v1/staff - List service providers 

GET /api/v1/appointments - View appointment calendar 

POST /api/v1/appointments - Book new appointment 

PUT /api/v1/appointments/{id}/reschedule - Reschedule appointment 

```

Query Parameter Best Practices

Query parameters in Azure REST APIs provide powerful filtering, sorting, and pagination capabilities. Here's how to implement them effectively:

Essential Query Parameters

The api-version parameter helps with versioning: 

``` 

GET /api/v1/customers?api-version=2023-03-01 

```

For a retail business's inventory management, implement filtering to quickly find products: 

``` 

GET /api/v1/inventory?$filter=category eq 'Electronics' 

GET /api/v1/inventory?$filter=stockLevel lt 10 

GET /api/v1/inventory?$filter=lastRestocked lt 2024-01-01 

```

For appointment scheduling systems, use pagination to manage daily schedules: 

``` 

GET /api/v1/appointments?date=2024-01-23&$top=10&$skip=0 

GET /api/v1/staff/availability?date=2024-01-23&service=haircut 

```

Advanced Query Scenarios

For a restaurant's order management system, implement complex filtering: 

``` 

GET /api/v1/orders?$filter=status eq 'InProgress' and deliveryTime lt '18:00' 

GET /api/v1/menu/items?$filter=category eq 'MainCourse' and isVegetarian eq true 

``` 

Support business-specific parameters for reporting: 

``` 

GET /api/v1/sales/report?timeRange=last7days&groupBy=category 

GET /api/v1/inventory/alerts?lowStock=true&department=fresh-produce 

GET /api/v1/customer/loyalty?status=gold&lastVisit=30days 

```

Collection Endpoints (GET, POST)

Managing collections of resources is a fundamental aspect of any business API. Whether you're building a system for inventory management, customer relations, or appointment scheduling, well-designed collection endpoints are crucial for day-to-day operations. Let's explore how to implement these endpoints effectively while considering real-world business needs.

You may also like [our video][5] on Microsoft Entra ID (Formerly Microsoft Azure Ad) Cloud Sync.

GET Operations for Collections

Collection retrieval is one of the most common API operations in business applications. For example, a small retail business might need to fetch product listings, current inventory levels, or customer orders. It's essential to implement these endpoints with pagination and proper metadata to handle growing datasets efficiently.

Consider a scenario where a retail store needs to retrieve their product catalog. The system should handle hundreds or thousands of items smoothly while providing useful metadata for navigation: 

```json 

{ 

  "value": [ 

    { 

      "id": "prod-12345", 

      "name": "Premium Wireless Headphones", 

      "category": "Electronics", 

      "specifications": { 

        "brand": "SoundTech", 

        "model": "WH-2000", 

        "color": "Midnight Black", 

        "connectivity": "Bluetooth 5.0" 

      }, 

      "price": { 

        "regular": 129.99, 

        "sale": null, 

        "currency": "USD" 

      }, 

      "inventory": { 

        "stockLevel": 45, 

        "lowStockThreshold": 10, 

        "lastRestocked": "2025-01-20T10:00:00Z", 

        "location": "Main Warehouse" 

      } 

    } 

  ], 

  "metadata": { 

    "totalCount": 1250, 

    "pageSize": 50, 

    "currentPage": 1, 

    "totalPages": 25, 

    "hasNextPage": true, 

    "hasPreviousPage": false 

  }, 

  "nextLink": "https://api.example.com/products?page=2&pageSize=50", 

  "links": { 

    "first": "/api/v1/products?page=1", 

    "next": "/api/v1/products?page=2", 

    "last": "/api/v1/products?page=25" 

  } 

} 

```

POST Operations for Resource Creation

Creating new resources requires careful validation and proper response handling. In a business context, this might involve creating new customer records, adding inventory items, or scheduling appointments. Let's look at a comprehensive example for an appointment booking system: 

```json 

POST /api/v1/appointments 

{ 

  "customerName": "John Smith", 

  "service": "Business Consultation", 

  "consultant": "Sarah Johnson", 

  "dateTime": "2025-01-25T14:30:00Z", 

  "duration": 60, 

  "notes": "Initial business planning session", 

  "contactDetails": { 

    "email": "[email protected]", 

    "phone": "+1-555-0123", 

    "preferredContact": "email" 

  }, 

  "preferences": { 

    "reminders": true, 

    "reminderType": "email", 

    "reminderAdvanceTime": 24 

  } 

} 

```

A successful response (201 Created) should provide comprehensive details that confirm the booking and include any additional system-generated information: 

```json 

{ 

  "id": "apt-67890", 

  "status": "Confirmed", 

  "customerName": "John Smith", 

  "service": "Business Consultation", 

  "consultant": "Sarah Johnson", 

  "dateTime": "2025-01-25T14:30:00Z", 

  "duration": 60, 

  "location": { 

    "room": "Conference Room A", 

    "floor": "2nd Floor", 

    "building": "Main Office" 

  }, 

  "notes": "Initial business planning session", 

  "contactDetails": { 

    "email": "[email protected]", 

    "phone": "+1-555-0123", 

    "preferredContact": "email" 

  }, 

  "preferences": { 

    "reminders": true, 

    "reminderType": "email", 

    "reminderAdvanceTime": 24 

  }, 

  "metadata": { 

    "created": "2025-01-23T15:30:00Z", 

    "createdBy": "Online Booking System", 

    "confirmationSent": true, 

    "confirmationTimestamp": "2025-01-23T15:30:05Z", 

    "lastModified": "2025-01-23T15:30:00Z" 

  } 

} 

```

Bulk Operations

For small businesses, efficient bulk operations can significantly improve productivity. Whether you're updating inventory after a large shipment or processing multiple appointments, well-designed bulk operations save time and reduce errors.

Batch Requests for Inventory Management

Consider a small retailer needing to update multiple product prices after a supplier change: 

```json 

POST /api/v1/batch 

{ 

  "requests": [ 

    { 

      "method": "PATCH", 

      "url": "/api/v1/products/prod-123", 

      "body": { 

        "price": 24.99, 

        "saleNote": "Supplier price adjustment" 

      } 

    }, 

    { 

      "method": "PATCH", 

      "url": "/api/v1/products/prod-124", 

      "body": { 

        "price": 19.99, 

        "saleNote": "Supplier price adjustment" 

      } 

    } 

  ], 

  "metadata": { 

    "reason": "Supplier price update January 2025", 

    "requestedBy": "Store Manager" 

  } 

} 

```

Transaction Management for Critical Operations

For operations that need to succeed or fail as a group, implement proper transaction handling. This is crucial for maintaining data consistency in scenarios like inventory adjustments across multiple locations: 

```json 

POST /api/v1/batch 

{ 

  "atomicity": "all", 

  "requests": [ 

    { 

      "method": "PUT", 

      "url": "/api/v1/inventory/location-a/products/prod-789", 

      "body": { 

        "adjustQuantity": -5, 

        "reason": "Inter-store transfer" 

      } 

    }, 

    { 

      "method": "PUT", 

      "url": "/api/v1/inventory/location-b/products/prod-789", 

      "body": { 

        "adjustQuantity": 5, 

        "reason": "Inter-store transfer" 

      } 

    } 

  ], 

  "transactionMetadata": { 

    "transferId": "T-123456", 

    "authorizedBy": "Regional Manager", 

    "timestamp": "2025-01-23T14:30:00Z" 

  } 

} 

```

Relationships Between Resources

In small business operations, resources are often interconnected in complex ways. A customer might have multiple appointments, each requiring specific services and staff members. These relationships need to be represented clearly in your API design.

Direct References in Service-Based Businesses

For a salon or spa, appointment resources need to reference both customers and services: 

``` 

GET /api/v1/appointments/{appointmentId}/services 

GET /api/v1/customers/{customerId}/preferences 

GET /api/v1/staff/{staffId}/schedule 

```

Resource References in Retail Operations

A point-of-sale system needs to handle complex relationships between sales, inventory, and customer data: 

```json 

{ 

  "id": "sale-123456", 

  "timestamp": "2025-01-23T15:45:00Z", 

  "customer": { 

    "id": "cust-789", 

    "href": "/api/v1/customers/cust-789", 

    "loyaltyLevel": "Gold" 

  }, 

  "items": [ 

    { 

      "id": "prod-456", 

      "href": "/api/v1/products/prod-456", 

      "quantity": 2, 

      "priceAtSale": 29.99, 

      "discount": { 

        "type": "LoyaltyDiscount", 

        "amount": 3.00 

      } 

    } 

  ], 

  "payment": { 

    "method": "CreditCard", 

    "status": "Completed", 

    "reference": "TX-987654" 

  } 

} 

```

Conclusion

Designing RESTful APIs requires careful consideration of URL structure, HTTP method usage, and relationship handling. For small businesses, a well-designed API can streamline operations, improve efficiency, and provide a foundation for growth. By following these patterns and best practices, you can create APIs that are intuitive, scalable, and maintainable.

Remember to regularly review your API design as your business requirements evolve and new features become necessary. Pay special attention to backwards compatibility when making changes, and always consider the impact on your existing integrations and applications.

Contact us today to discover how our services can help your business succeed. Our expert team provides tailored solutions to optimize your technology infrastructure, enhance productivity, and drive growth.

Frequently Asked Questions

Which HTTP Methods are Supported by Azure REST API and RESTful APIs in General?

Azure REST APIs and RESTful APIs both support GET (read), POST (create), PUT (update/replace), PATCH (partial update), DELETE (remove), and HEAD (metadata) methods, with OPTIONS and TRACE available for specific scenarios. These methods provide a complete toolkit for building robust business applications. Each method serves a distinct purpose, ensuring efficient communication between clients and servers in API-driven environments.

How to Create a RESTful API in Azure?

Build Azure RESTful APIs using Azure API Management for hosting, Azure Functions for serverless backends, and Azure App Service for traditional web APIs. These services provide the infrastructure needed to run secure, scalable APIs for your business applications while following REST principles and implementing proper authentication.

How to Design REST API URLs?

Design URLs using nouns not verbs (/products instead of /getProducts), implement hierarchy (/customers/{id}/orders), use plural nouns for collections, include versioning, and leverage query parameters for filtering and pagination. This creates an intuitive API structure that grows with your business needs.

[5]: https://www.microsoft.com/en-us/security/business/identity-access/microsoft-entra-identer code here