Golang CLI Compiler Online

A simple, CLI-based tool to run and test Go code in real time without local setup.

Version

Sample

🚀 192,879 total executions (231 this month)

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🐹 About This Go Online Executor

The CodeUtility Go Executor lets you write and run Go code directly in your browser — no installation, setup, or local environment required. It’s powered by a secure sandbox that supports real Go compiler versions 1.19, 1.20, and 1.21.

This tool compiles and executes real Go programs in the cloud, giving you an authentic Go environment. You can test short snippets, experiment with packages, and explore Go’s powerful concurrency features using goroutines and channels.

It’s perfect for learning and practicing core Go concepts such as variables, functions, structs, slices, maps, interfaces, and error handling — all without installing any tools locally.

Whether you’re exploring Go for the first time, testing backend logic, or learning how concurrency works, the CodeUtility Go Executor offers a clean, fast, and browser-based way to run Go code instantly.

⚙️ How to Use This Tool

1. Select a Go version (1.19, 1.20, or 1.21) from the dropdown at the top of the editor.
2. Write or paste your Go code into the editor area.
3. Click Run to compile and execute your program — output will appear in the console below.
4. While running, a Stop button appears — click it to stop execution early.
5. Use Fix Code to automatically correct minor formatting or syntax issues.
6. After fixing, a Fixes button appears — click it to review recent fixes.
7. Use the Upload button to import code from a local file, or the Download button to save your current code from the editor.
8. Each execution runs up to 20 seconds before automatically terminating.

🧠 Tip: This environment runs real Go code securely in your browser — no login or local setup required.

💡 Go Basics & Examples You Can Try Above

1. Declaring Variables and Constants

Use var or := to declare variables. Use const for constants.

package main

var x int = 10
const Pi = 3.14

func main() {
    name := "Alice"
    isActive := true
    println(x, Pi, name, isActive)
}

2. Conditionals (if / switch)

Go supports if-else and switch statements with clean syntax.

x := 2
if x == 1 {
    println("One")
} else if x == 2 {
    println("Two")
} else {
    println("Other")
}

switch x {
case 1:
    println("One")
case 2:
    println("Two")
default:
    println("Other")
}

3. Loops

Go uses only the for loop, but it can act like a while loop.

for i := 0; i < 3; i++ {
    println(i)
}

n := 3
for n > 0 {
    println(n)
    n--
}

4. Arrays

Arrays have fixed size. Use slices for dynamic lists.

var nums = [3]int{10, 20, 30}
println(nums[1])

5. Slice Manipulation

Use slices and the built-in append, len, copy, and slicing syntax.

fruits := []string{"apple", "banana"}
fruits = append(fruits, "cherry")
fruits = fruits[1:]  // slice
println(len(fruits))

for _, fruit := range fruits {
    println(fruit)
}

6. Console Input/Output

Use fmt.Print, fmt.Scan, and fmt.Println.

import "fmt"

var name string
fmt.Print("Enter your name: ")
fmt.Scan(&name)
fmt.Println("Hello", name)

7. Functions

Functions are declared with func and can return multiple values.

func greet(name string) string {
    return "Hello, " + name
}

message := greet("Alice")
println(message)

8. Maps

Maps are key-value stores. Declare with make().

ages := map[string]int{"Alice": 30}
ages["Bob"] = 25
println(ages["Alice"])

9. Error Handling

Go uses multiple return values for errors instead of exceptions.

import "errors"

func fail() error {
    return errors.New("something went wrong")
}

err := fail()
if err != nil {
    println(err.Error())
}

10. File I/O

Use os and io/ioutil packages to read/write files.

import (
  "fmt"
  "os"
  "io/ioutil"
)

ioutil.WriteFile("file.txt", []byte("Hello File"), 0644)

data, _ := ioutil.ReadFile("file.txt")
fmt.Println(string(data))

11. String Manipulation

Use the strings package for string operations.

import "strings"

text := "  Hello World  "
println(strings.TrimSpace(text))
println(strings.ToUpper(text))
println(strings.ReplaceAll(text, "Hello", "Hi"))

words := strings.Split(text, " ")
fmt.Println(words)

12. Structs & Objects

Use structs to define custom types with methods.

type Person struct {
  Name string
}

func (p Person) Greet() string {
  return "Hi, I'm " + p.Name
}

p := Person{Name: "Alice"}
println(p.Greet())

13. References (Pointers)

Go supports pointers using * and &.

x := 10
ptr := &x
*ptr = 20
println(x) // 20