Uint8Array.prototype.toHex()

Baseline Newly available

This feature works across the latest devices and browser versions. This feature might not work in older devices or browser versions. It's been available across browsers since September 2025.

The toHex() method of Uint8Array instances returns a hex-encoded string based on the data in this Uint8Array object.

This method creates strings from a byte array. To convert individual numbers into hex, use the Number.prototype.toString() method with radix set to 16 instead.

Syntax

toHex()

Parameters

None.

Return value

A hex-encoded string representing the data in the Uint8Array.

Examples

Encoding binary data

This example encodes data from a Uint8Array into a hex string.

const uint8Array = new Uint8Array([202, 254, 208, 13]);
console.log(uint8Array.toHex()); // "cafed00d"

const data = new Uint8Array([255, 0, 0, 0, 255, 0, 0, 0, 255]);
for (let i = 0; i < data.length; i += 3) {
  console.log(data.slice(i, i + 3).toHex());
}
// "ff0000"
// "00ff00"
// "0000ff"

Specifications

Specification
ECMAScript® 2027 Language Specification # sec-uint8array.prototype.tohex

Browser compatibility

	Desktop					Mobile							Server
	Chrome	Edge	Firefox	Opera	Safari	Chrome Android	Firefox for Android	Opera Android	Safari on iOS	Samsung Internet	WebView Android	WebView on iOS	Bun	Deno	Node.js
`toHex`	140	140	133	124	18.2	140	133	92	18.2	30.0	140	18.2	1.1.22	2.5.0	25.0.0