Fiber — Express-Inspired Web Framework Written in Go

What it is

Fiber is a web framework written in Go, inspired by Express.js. Built on top of Fasthttp (the fastest HTTP engine for Go), it offers a familiar Express-like API with zero-allocation routing, built-in middleware, WebSocket support, and rate limiting. Developers coming from Node.js can transition to Go with minimal API learning curve.

This tool is for backend developers who want Go's performance and type safety with an API design they already know from Express. It is also for Go developers who want a batteries-included framework.

How it saves time or tokens

Fiber's Express-like API reduces the learning curve for Node.js developers moving to Go. Route definitions, middleware chaining, and request handling follow the same patterns. The built-in middleware covers common needs (CORS, compression, logging, rate limiting) without third-party packages.

How to use

1. Initialize a Go module and install Fiber.
2. Define routes with familiar Express-like syntax.
3. Add middleware as needed.
4. Run the server.

# Initialize project
mkdir myapi && cd myapi
go mod init myapi
go get github.com/gofiber/fiber/v2

Example

package main

import (
    "github.com/gofiber/fiber/v2"
    "github.com/gofiber/fiber/v2/middleware/cors"
    "github.com/gofiber/fiber/v2/middleware/logger"
)

func main() {
    app := fiber.New()

    // Middleware
    app.Use(logger.New())
    app.Use(cors.New())

    // Routes
    app.Get("/", func(c *fiber.Ctx) error {
        return c.JSON(fiber.Map{"message": "Hello, Fiber"})
    })

    app.Get("/users/:id", func(c *fiber.Ctx) error {
        id := c.Params("id")
        return c.JSON(fiber.Map{"id": id, "name": "Alice"})
    })

    app.Post("/users", func(c *fiber.Ctx) error {
        type User struct {
            Name  string `json:"name"`
            Email string `json:"email"`
        }
        user := new(User)
        if err := c.BodyParser(user); err != nil {
            return c.Status(400).JSON(fiber.Map{"error": err.Error()})
        }
        return c.Status(201).JSON(user)
    })

    app.Listen(":3000")
}

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Common pitfalls

• Fiber uses Fasthttp, not net/http. This means some net/http middleware and libraries are not directly compatible.
• The *fiber.Ctx is reused across requests for performance. Do not store references to it beyond the handler scope.
• Fiber's request body parsing requires struct tags. Missing or incorrect tags cause silent parsing failures.
• Error handling differs from Express. Always return errors from handlers; unhandled panics crash the server.
• WebSocket handling in Fiber requires the separate github.com/gofiber/websocket package.
• Review the official documentation before deploying to production to ensure compatibility with your specific environment and requirements.
• Start with default settings and customize incrementally. Changing too many configuration options at once makes debugging harder.
• Keep your installation updated to the latest stable version. Security patches and bug fixes are released regularly.