Fiber for Go: Complete Guide with Examples

What is Fiber and why do you need it?

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Fiber is a fast web framework for Go, inspired by the popular Express.js framework for Node.js. It is designed for building high-performance web applications and APIs with minimal memory consumption. Fiber uses a non-blocking I/O model based on goroutines and the fasthttp package, making it one of the fastest web frameworks for Go.

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Why do you need Fiber?

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• Performance: Fiber works significantly faster than the standard net/http package by using fasthttp. It can handle tens of thousands of requests per second.
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• Simplicity and familiar syntax: If you are familiar with Express.js, you will quickly learn Fiber. The API is very similar: routes, middleware, request handlers — everything is intuitive.
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• Zero memory allocation: Fiber strives to minimize memory allocation, which reduces load on the garbage collector and improves stability.
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• Extensibility: A large number of built-in middleware (CORS, logging, compression, sessions, etc.) and the ability to create your own.
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• Support for modern standards: Fiber supports HTTP/2, WebSocket, template engines, static files, and much more.
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Installing Fiber

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Fiber is a library for Go, so installation is done through the standard Go package manager. Make sure you have Go version 1.16 or higher installed.

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# Initialize module (if not already done)\ngo mod init myapp\n\n# Install Fiber (latest stable version)\ngo get github.com/gofiber/fiber/v2

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After that, you can import Fiber into your project:

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import "github.com/gofiber/fiber/v2"

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Note: If you are using an older version of Go, you may need to install Fiber v1. However, it is recommended to use v2 as it is more actively developed.

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Quick start with code example

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Create a file main.go and write a simple HTTP server:

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package main\n\nimport "github.com/gofiber/fiber/v2"\n\nfunc main() {\n    // Create a new Fiber application\n    app := fiber.New()\n\n    // Define GET route /\n    app.Get("/", func(c *fiber.Ctx) error {\n        return c.SendString("Hello, Fiber!")\n    })\n\n    // Start server on port 3000\n    app.Listen(":3000")\n}

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Run the server:

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go run main.go

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Open your browser and go to http://localhost:3000. You will see the message "Hello, Fiber!".

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Explanation:

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• fiber.New() — creates a new application instance.
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• app.Get("/", handler) — registers a handler for a GET request to the root path.
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• c *fiber.Ctx — request context, providing access to request and response data.
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• c.SendString() — sends a string as a response.
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• app.Listen(":3000") — starts the server on port 3000.
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Main methods and functions of Fiber

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Let's look at 10 key methods and functions of Fiber with detailed descriptions and examples.

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1. fiber.New()

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What it does: Creates a new Fiber application instance with default settings or with passed configuration.

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Parameters: Accepts an optional argument config ...fiber.Config — a structure with settings (e.g., AppName, Prefork, ServerHeader, etc.).

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Example:

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package main\n\nimport "github.com/gofiber/fiber/v2"\n\nfunc main() {\