🚀 Gofsen - HTTP Framework for Go

Gofsen is a lightweight, Express.js-inspired HTTP framework for Go. Simple, fast, and powerful.

---

📦 Installation

go get github.com/Bakemono-san/gofsen

CLI (gofsen-cli) Installation

You can install the CLI in multiple ways:

• Using go install (latest from main):

go install github.com/Bakemono-san/gofsen/cmd/gofsen-cli@latest

• Using Homebrew (macOS/Linux):

brew tap Bakemono-san/homebrew-tap
brew install gofsen-cli

• Linux via APT (Cloudsmith hosted repo):

# Add the APT repository (Ubuntu/Debian)
curl -1sLf 'https://dl.cloudsmith.io/public/bakemono-san/gofsen/setup.deb.sh' | sudo -E bash

# Install
sudo apt update
sudo apt install gofsen-cli

• RHEL/CentOS/Alma/Rocky via YUM/DNF (Cloudsmith hosted repo):

# Add the YUM/DNF repository
curl -1sLf 'https://dl.cloudsmith.io/public/bakemono-san/gofsen/setup.rpm.sh' | sudo -E bash

# Install
sudo dnf install gofsen-cli
# or: sudo yum install gofsen-cli

• Download prebuilt binaries (Windows/macOS/Linux) from the Releases page.

Verify installation:

gofsen-cli --version

CLI quickstart:

# Create a new project (interactive)
gofsen-cli new

# Generate CRUD routes for a resource
gofsen-cli gen route users

# Generate a middleware
gofsen-cli gen middleware auth

# Generate a simple handler
gofsen-cli gen handler status

Tip:

• Homebrew upgrade later: brew update && brew upgrade gofsen-cli
• If APT says it can't find the package, ensure you added the repo (lowercase URL) and ran sudo apt update.

🚀 Quick Start

package main

import "github.com/Bakemono-san/gofsen"

func main() {
    app := gofsen.New()
    
    app.GET("/", func(c *gofsen.Context) {
        c.JSON(map[string]string{
            "message": "Hello Gofsen!",
            "version": gofsen.Version,
        })
    })
    
    app.Listen("8080")
}

✨ Features

✅ HTTP Routing

• HTTP Methods: GET, POST, PUT, DELETE, PATCH
• Route Parameters: /users/:id
• Route Groups: /api/v1
• Query Parameters: ?name=value

✅ Middleware System

• Logger: Automatic request logging
• Recovery: Panic recovery
• CORS: Complete CORS support with configuration
• Custom Middleware: Create your own middlewares

✅ Request/Response Helpers

• JSON: Automatic parsing and sending
• Query Params: Easy access to parameters
• Route Params: Dynamic parameter support
• Error Handling: Built-in error management

💡 Examples

Basic Server

package main

import "github.com/Bakemono-san/gofsen"

func main() {
    app := gofsen.New()
    
    // Middlewares
    app.Use(gofsen.Logger())
    app.Use(gofsen.Recovery())
    app.Use(gofsen.CORS())
    
    // Routes
    app.GET("/health", func(c *gofsen.Context) {
        c.JSON(map[string]string{"status": "OK"})
    })
    
    app.Listen("8080")
}

REST API

package main

import "github.com/Bakemono-san/gofsen"

type User struct {
    ID   int    `json:"id"`
    Name string `json:"name"`
}

func main() {
    app := gofsen.New()
    app.Use(gofsen.Logger())
    
    api := app.Group("/api/v1")
    
    // GET /api/v1/users
    api.GET("/users", getUsers)
    
    // GET /api/v1/users/:id
    api.GET("/users/:id", getUser)
    
    // POST /api/v1/users
    api.POST("/users", createUser)
    
    app.Listen("3000")
}

func getUsers(c *gofsen.Context) {
    users := []User{{ID: 1, Name: "Alice"}}
    c.JSON(users)
}

func getUser(c *gofsen.Context) {
    id := c.Param("id")
    c.JSON(map[string]string{"id": id})
}

func createUser(c *gofsen.Context) {
    var user User
    if err := c.BindJSON(&user); err != nil {
        c.Error(400, "Invalid JSON")
        return
    }
    c.Status(201).JSON(user)
}

Custom Middleware

package main

import (
    "log"
    "github.com/Bakemono-san/gofsen"
)

func main() {
    app := gofsen.New()
    
    // Authentication middleware
    authMiddleware := func(c *gofsen.Context) {
        token := c.Request.Header.Get("Authorization")
        if token == "" {
            c.Error(401, "Missing token")
            return
        }
        log.Printf("User authenticated with token: %s", token)
        c.Next() // Important: continue to next handler
    }
    
    // Protected routes
    protected := app.Group("/protected")
    protected.Use(authMiddleware)
    
    protected.GET("/profile", func(c *gofsen.Context) {
        c.JSON(map[string]string{"message": "Protected route"})
    })
    
    app.Listen("3000")
}

🛠️ API Reference

Router Methods

app := gofsen.New()                    // Create instance
app.Use(middleware)                    // Add global middleware
app.GET(path, handler)                 // GET route
app.POST(path, handler)                // POST route  
app.PUT(path, handler)                 // PUT route
app.DELETE(path, handler)              // DELETE route
app.PATCH(path, handler)               // PATCH route
app.Group(prefix)                      // Create route group
app.Listen(port)                       // Start server
app.PrintRoutes()                      // Print routes

Context Methods

// Request
c.Param("id")                          // Route parameter
c.QueryParam("name")                   // Query parameter
c.BindJSON(&struct{})                  // Parse JSON

// Response
c.JSON(data)                           // JSON response
c.Text("Hello")                        // Text response
c.HTML("<h1>Hello</h1>")              // HTML response
c.Status(200)                          // Status code
c.Error(404, "Not found")             // Error with code

// Middleware
c.Next()                               // Next middleware

Built-in Middlewares

gofsen.Logger()                        // Request logger
gofsen.Recovery()                      // Panic recovery
gofsen.CORS()                          // CORS with defaults
gofsen.CORSFromEnv()                   // CORS from environment variables
gofsen.CORSWithConfig(config)          // CORS with custom config

🔧 CORS Configuration

Manual Configuration

corsConfig := gofsen.CORSConfig{
    AllowOrigins: []string{"http://localhost:3000", "https://myapp.com"},
    AllowMethods: []string{"GET", "POST", "PUT", "DELETE"},
    AllowHeaders: []string{"Content-Type", "Authorization"},
}

app.Use(gofsen.CORSWithConfig(corsConfig))

Environment Variables Configuration

Gofsen supports configuring CORS through environment variables for easier deployment and configuration management:

// Use CORS configured from environment variables
app.Use(gofsen.CORSFromEnv())

Supported Environment Variables:

Variable	Description	Default	Example
CORS_ALLOWED_ORIGINS	Allowed origins (comma-separated)	*	http://localhost:3000,https://myapp.com
ALLOWED_ORIGINS	Fallback for allowed origins	*	https://example.com
CORS_ALLOWED_METHODS	Allowed HTTP methods	GET,POST,PUT,DELETE,PATCH,OPTIONS	GET,POST,PUT
CORS_ALLOWED_HEADERS	Allowed headers	Content-Type,Authorization	Content-Type,X-API-Key

Example .env file:

# CORS Configuration
CORS_ALLOWED_ORIGINS=http://localhost:3000,http://localhost:5173,https://myapp.com
CORS_ALLOWED_METHODS=GET,POST,PUT,DELETE,PATCH,OPTIONS
CORS_ALLOWED_HEADERS=Content-Type,Authorization,X-Requested-With

Usage in code:

package main

import "github.com/Bakemono-san/gofsen"

func main() {
    app := gofsen.New()
    
    // CORS will automatically read from environment variables
    app.Use(gofsen.CORSFromEnv())
    
    app.GET("/", func(c *gofsen.Context) {
        c.JSON(map[string]string{"message": "CORS configured from env!"})
    })
    
    app.Listen("8080")
}

📊 Framework Comparison

Framework	Import	Philosophy
Gofsen	github.com/Bakemono-san/gofsen	Simple, Express.js-like
Gin	github.com/gin-gonic/gin	Performance, minimalist
Fiber	github.com/gofiber/fiber/v2	Express.js for Go
Echo	github.com/labstack/echo/v4	High performance

Migration from Gin

// Gin
r := gin.Default()
r.GET("/users/:id", func(c *gin.Context) {
    id := c.Param("id")
    c.JSON(200, gin.H{"id": id})
})

// Gofsen
app := gofsen.New()
app.GET("/users/:id", func(c *gofsen.Context) {
    id := c.Param("id")
    c.JSON(map[string]string{"id": id})
})

🧪 Testing

go test ./...

📈 Performance

Gofsen is optimized for excellent performance with a simple API:

• Fast routing with optimized regex
• Efficient middleware chain
• Zero allocation in common cases

🤝 Contributing

Contributions are welcome!

1. Fork the project
2. Create your feature branch (git checkout -b feature/amazing-feature)
3. Commit your changes (git commit -m 'Add amazing feature')
4. Push to the branch (git push origin feature/amazing-feature)
5. Open a Pull Request

📄 License

This project is licensed under the MIT License. See the LICENSE file for details.

🌟 Why Choose Gofsen?

• Simple: Intuitive API inspired by Express.js
• Lightweight: No external dependencies
• Fast: Optimized performance
• Flexible: Extensible middleware system
• Production-ready: Robust error handling

---

Made with ❤️ by Bakemono

📚 Links

• Documentation: pkg.go.dev/github.com/Bakemono-san/gofsen
• Repository: github.com/Bakemono-san/gofsen
• Issues: github.com/Bakemono-san/gofsen/issues
• Releases: github.com/Bakemono-san/gofsen/releases