Code Explainers

Go code explainers

go 
package httpx
 
import (
	"net/http"

A retrying HTTP transport in Go

http middleware retry
Intermediate 8 steps
go 
package config
 
import (
	"fmt"

Loading typed config from environment variables in Go

configuration environment-variables type-parsing
Beginner 8 steps
go 
package middleware
 
import (
	"crypto/subtle"

Building an API-key middleware in Gin

middleware authentication dependency-injection
Intermediate 5 steps
go 
package api
 
func RegisterRoutes(r *gin.Engine, deps *Dependencies) {
	r.GET("/health", func(c *gin.Context) {

Layering route groups and middleware in Gin

routing middleware authentication
Intermediate 8 steps
go 
package payments
 
import (
	"context"

Fetching a charge over HTTP in Go

context-timeout http-client json-decoding
Intermediate 6 steps
go 
package scheduler
 
import (
	"context"

A context-aware heartbeat ticker in Go

concurrency channels context
Intermediate 5 steps
go 
package middleware
 
import (
	"compress/gzip"

How gzip response compression works in Gin

middleware compression http
Intermediate 8 steps
go 
package middleware
 
import (
	"context"

Correlation ID tracing middleware in Gin

middleware request tracing structured logging
Intermediate 7 steps
go 
package web
 
import (
	"embed"

Serving embedded static assets in Go

embed static-assets http-handler
Intermediate 8 steps
go 
package pipeline
 
import "sync"
 

The fan-in pattern in Go channels

concurrency channels fan-in
Advanced 8 steps
go 
package feed
 
import (
	"encoding/json"

Streaming a JSON array in Go

streaming json decoder
Intermediate 6 steps
go 
package validate
 
import (
	"fmt"

Struct validation with reflection in Go

reflection struct-tags validation
Intermediate 7 steps
go 
package middleware
 
import (
	"bytes"

Verifying webhook HMAC signatures in Gin

hmac middleware webhooks
Intermediate 7 steps
go 
package handlers
 
import (
	"fmt"

Handling secure file uploads in Gin

file-upload validation security
Intermediate 7 steps
go 
package server
 
import (
	"net/http"

Serving a single-page app with Gin

static-files spa routing
Intermediate 7 steps
go 
package handlers
 
import (
	"fmt"

Handling multipart profile uploads in Gin

form binding file upload validation
Intermediate 7 steps
go 
package metrics
 
import (
	"sync/atomic"

A lock-free request counter in Go

concurrency atomics lock-free
Intermediate 6 steps
go 
package middleware
 
import (
	"time"

Building a request logger middleware in Gin

middleware structured-logging closures
Intermediate 6 steps