Chapter 45: OpenAPI and Swagger in Go

Auto-generated API documentation. In this chapter, you will learn openapi and swagger in depth with Go code examples, explanations, and best practices.

Overview

This chapter covers openapi and swagger for Kungfu.js developers using Go. We will start with the basics, move through practical examples, and end with advanced techniques and common pitfalls.

Why This Matters

Understanding openapi and swagger is essential because it is a core part of building web applications. Every real-world app needs to handle auto-generated api documentation. Skipping this chapter would leave a gap in your knowledge that would cause problems later.

Code Example

Kungfu.js automatically generates OpenAPI 3.1 documentation from your routes. No annotations needed.

Visit /openapi.json for the raw spec, or /docs for the Swagger UI.

Common Mistakes

• Not reading the documentation: Always check the API reference when something does not work as expected.
• Skipping security: Never disable the default middleware unless you have a very good reason. Security is not optional.
• Not testing: Write tests for your handlers. Kungfu.js makes this easy with the built-in test utilities.

Summary

In this chapter, you learned about openapi and swagger in Go. You saw code examples, understood how things work under the hood, and learned about common mistakes to avoid.

What is Next?

In chapter 46, we will cover Error Handling: Unified error format with code, message, detail.