Online Go Compiler

Write, compile, and run Go code in the browser, perfect for learning, practice, and quick validation.

Go Code Editor

Output

Standard Output (stdout)

 
  
 
Standard Error (stderr)
 
 
   
 
 
  
 
How to Use
 
     
  • Write Go code in the left editor (include the package main and func main() entry point).
    •  
  • Click "Run Code" to compile and execute online.
    •  
  • The right panel displays output and error details.
    •  
  • The green area shows standard output (for example, fmt.Println output).
    •  
  • The red area shows compile/run errors and warnings.
    •  
  • Execution info includes the exit code and run status.
    •  
  • Shortcut: Ctrl+Enter (use Cmd+Enter on Mac).
    •  
 
  
  
 
Go Basics
 
 
 
Basic Structure:
 

package main

import "fmt"
 

func main() {

    fmt.Println("Hello, Go!")

}

 
 
 
Common Packages:
 
     
  • fmt - Formatting I/O
    •  
  • strings / strconv - String utilities and conversions
    •  
  • sort - Sorting tools
    •  
  • time - Time and scheduling
    •  
  • math - Math functions
    •  
 
 
 
  
 
Types & Collections
 
 
 
Slices & Maps:
 

nums := []int{3, 7, 1, 9, 4}

m := map[string]int{"alice": 3, "bob": 5}

 
 
 
Example:
 

for i := 0; i < len(nums); i++ {

    fmt.Println(nums[i])

}

for k, v := range m {

    fmt.Println(k, v)

}

 
 
 
  
 
Control Structures
 
 
 
Conditionals & Loops:
 

n := 7

if n%2 == 0 { fmt.Println("even") } else { fmt.Println("odd") }

for i := 0; i < 3; i++ { fmt.Println(i) }

 
 
 
  
 
Functions & Methods
 
 
 
Function Example:
 

func add(a, b int) int { return a + b }

func main() { fmt.Println(add(2, 3)) }

 
 
 
 
  
 
FAQ
 
 
 
Which Go versions are supported?
 
It typically supports mainstream Go versions; the exact version depends on the backend environment.
 
 
 
Can I use third-party libraries?
 
The sandboxed runtime currently cannot fetch external dependencies. Use standard library examples instead.
 
 
 
Is there a time limit on execution?
 
Yes. To prevent infinite loops and ensure fair use, compilation/execution has a time limit and will stop automatically when exceeded.
 
 
 
Can I save my code?
 
Saving online is not available yet. Copy important code locally or store snippets in your bookmarks/notes.
 
 
 
Does it support interactive input?
 
Interactive input is not supported at the moment. Place test data directly in your code for validation.
 
 
 
  
 
Sample Programs (click Run above)
 
 
 
1. Recursive Factorial
 

package main

import "fmt"
 

func fact(n int) int { if n <= 1 { return 1 } return n * fact(n-1) }

func main() { fmt.Println("5! =", fact(5)) }

 
 
 
2. Max Value in Slice
 

package main

import "fmt"
 

func main() {

    nums := []int{3, 7, 1, 9, 4}

    maxv := nums[0]

    for i := 1; i < len(nums); i++ {

      if nums[i] > maxv { maxv = nums[i] }

    }

    fmt.Println("Maximum:", maxv)

}