how to convert interface to byte in golang?

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To convert interface to byte in golang, use interface.([]byte) method, it will convert interface to byte. You have to only pass your byte type in interface.

Follow the below tutorial if you are struggling with installing GO in windows.

Today, I will show you how do I convert a interface to byte in golang, as above mentioned I’m going to use interface.([]byte) method.

Let’s start our Golang convert interface to byte example


package main

import (

func passInterface(v interface{}) {
	b, ok := v.(*[]byte)

func main() {
	passInterface(&[]byte{0x00, 0x01, 0x02})

In the above example, we have converted the interface value to a byte and printed in golang console. let’s check the output.


&[0 1 2]

I hope it helps you, All the best 👍.

Try it Yourself

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