Route Definition

Okapi provides a clean, declarative way to define and register HTTP routes. It supports all standard HTTP methods, including GET, POST, PUT, DELETE, PATCH, and OPTIONS.

Routes can be defined individually or grouped and registered in bulk using okapi.RegisterRoutes and the RouteDefinition struct. This is especially useful when organizing routes by controller, service, or feature module.

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Defining Routes with RouteDefinition

For better structure and maintainability, routes are typically defined as a slice of okapi.RouteDefinition. This pattern fits well with controller/service-based architectures.

Example: Book Service

type BookService struct{}

func (bc *BookService) GetBooks(c *okapi.Context) error {
	// Simulate fetching books from a database
	return c.OK(okapi.M{
		"success": true,
		"message": "Books retrieved successfully",
	})
}

func (bc *BookService) CreateBook(c *okapi.Context) error {
	// Simulate creating a book in a database
	return c.Created(okapi.M{
		"success": true,
		"message": "Book created successfully",
	})
}

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Defining Service Routes

You can attach routes directly to your service/controller by returning a slice of okapi.RouteDefinition:

func (bc *BookService) BookRoutes() []okapi.RouteDefinition {
	apiGroup := &okapi.Group{Prefix: "/api"}

	return []okapi.RouteDefinition{
		{
			Method:      http.MethodPut,
			Path:        "/books",
			Handler:     bc.UpdateBook,
			Group:       apiGroup,
			Summary:     "Update Book",
			Description: "Update an existing book",
			Request:     &BookRequest{},    // OpenAPI request body 
			Response:    &BooksResponse{},  // OpenAPI success response
		},
		{
			Method:      http.MethodPost,
			Path:        "/books",
			Handler:     bc.CreateBook,
			Group:       apiGroup,
			Middlewares: []okapi.Middleware{customMiddleware},
			Security:    bearerAuthSecurity, // Apply Bearer Auth security scheme

			// Alternative way to define OpenAPI metadata using RouteOptions
			Options: []okapi.RouteOption{
				okapi.DocSummary("Create Book"),
				okapi.DocDescription("Create a new book"),
				okapi.DocRequestBody(&models.Book{}),
				okapi.DocResponse(&models.Book{}), // 201 Created
				okapi.DocResponse(http.StatusUnauthorized, models.AuthResponse{}),
			},
		},
	}
}

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OpenAPI & Documentation Fields

Each RouteDefinition can directly enrich your OpenAPI documentation:

Field	Description
OperationId	OperationId is an optional unique identifier for the route
Summary	Short summary displayed in Swagger UI.
Description	Detailed description of the endpoint.
Request	Request body schema for OpenAPI documentation.
Response	Default success response schema.
Security	Security requirements (e.g. Bearer, API Key, OAuth2).
Options	Advanced documentation and behavior using RouteOption helpers.

💡 You can mix Summary, Description, Request, and Response with RouteOption helpers depending on your preference.

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Registering Routes

Once routes are defined, you can register them using one of the following approaches:

app := okapi.Default()
bookService := &BookService{}

// Method 1: Register directly on the app instance
app.Register(bookService.BookRoutes()...)

// Method 2: Use the global helper
okapi.RegisterRoutes(app, bookService.BookRoutes())

Both methods produce the same result—use whichever best fits your project style.

You can also register routes under an existing group:

apiGroup := app.Group("/api")
apiGroup.Register(bookService.BookRoutes()...)

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Full Example

A complete, runnable example is available in:

👉 https://github.com/jkaninda/okapi/tree/main/examples/route-definition

Features Demonstrated

A complete, runnable example with Docker images is available in:

👉 https://github.com/jkaninda/okapi-example

This example demonstrates:

• Grouped routes
• Controllers/services
• Middleware usage
• OpenAPI documentation generation

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