Echo Middleware: Skipping the Chain

In this tutorial, you'll learn about Echo Middleware: Skipping the Chain. We cover key concepts, practical examples, and best practices.

Echo middleware registration -- Register Echo middleware in the correct order using e.Use() for global or group.Use() for scoped middleware.

The Problem

Middleware in Echo must be registered before route handlers. If you call e.Use() after defining routes, the middleware does not apply.

Wrong

e := echo.New()
e.GET("/hello", helloHandler)
e.Use(middleware.Logger()) // Too late!

Output:

$ curl http://localhost:8080/hello
// No logging output

Right

e := echo.New()
e.Use(middleware.Logger())
e.Use(middleware.Recover())
e.GET("/hello", helloHandler)
g := e.Group("/admin")
g.Use(middleware.BasicAuth(credentials))
g.GET("/dashboard", dashboardHandler)

Output:

$ curl http://localhost:8080/hello
{"time":"2026-06-24T10:00:00Z","method":"GET","path":"/hello"}

Prevention

• Register global middleware with e.Use() before defining routes
• Use e.Pre() for middleware before router matching
• Use group.Use() for scoped middleware
• Middleware order matters: first registered = first executed
• Common order: Logger -> Recover -> CORS -> Auth -> Rate Limit

Common Mistakes with echo middleware

1. Overlapping type class instances that cause GHC to reject the program with ambiguous dispatch errors
2. Non-exhaustive pattern matches that compile with warnings then crash at runtime
3. Misunderstanding that String is [Char] with poor performance for large text operations

These mistakes appear frequently in real-world GO code. DodaTech's contributors have identified these patterns through analysis of open-source projects and production systems.

Practice Exercise

Write a pure function that safely divides two integers using Maybe, then test it with edge cases like division by zero and negative numbers.

This exercise reinforces the concepts covered in this guide. Try implementing it before checking online solutions.

FAQ

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