Complete Guide to the bytes Package in Go

Stdlib

2026-04-17T12:05:42+00:00

The Go bytes package offers efficient functions for searching, comparing, and transforming byte slices.

The bytes package in Go provides functions for manipulating byte slices, such as searching, comparing, and transforming data. It is the byte-slice equivalent of the strings package and is essential for efficient binary data handling.

package main

import (
	"bytes"
	"fmt"
)

func main() {
	data := []byte("hello world")
	if bytes.Contains(data, []byte("world")) {
		fmt.Println("Found 'world'")
	}
	upper := bytes.ToUpper(data)
	fmt.Println(string(upper))
}