API Error Handling Complete Guide — Status Codes, Formats, and Strategies

In this tutorial, you will learn about API Error Handling Complete Guide. We cover key concepts, practical examples, and best practices to help you master this topic.

API error handling is the practice of returning consistent, informative error responses using appropriate HTTP status codes, structured error formats, and clear messages.

What You'll Learn

• HTTP status code ranges and their meanings
• Standardized error formats like RFC 7807 and JSON:API
• Error handling patterns for authentication, validation, and Rate Limiting
• Error logging and monitoring strategies

Why Error Handling Matters

Good error handling reduces debugging time, improves developer experience, and prevents security information leaks. Durga Antivirus Pro's API returns structured errors that clients can handle programmatically.

flowchart TD
    A["API Request"] --> B{"Error?"}
    B -->|"No"| C["200 Success"]
    B -->|"Yes"| D{"Error Type"}
    D -->|"Validation"| E["400 + field errors"]
    D -->|"Auth"| F["401 Missing token"]
    D -->|"Permission"| G["403 Forbidden"]
    D -->|"Not Found"| H["404 + details"]
    D -->|"Rate Limit"| I["429 + retry-after"]
    D -->|"Server Error"| J["500 + trace ID"]
    style D fill:#dbeafe,stroke:#2563eb

What's Next

Start with HTTP Status Codes or jump to Error Response Format.