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The digest() method generates a cryptographically secure digest of the given data. A digest is a short fixed-length value derived from some input data. The digest() method is commonly used to compute a checksum of data or to verify the integrity of data.


digest(algorithm, data)


algorithma string or object with a single name string propertyNames the hash function to use. Supported values are "SHA-1", "SHA-256", "SHA-384" and "SHA-512". Note that the SHA-1 hash function is not considered safe for cryptographic use.
dataArrayBuffer, TypedArray, or DataViewThe data to be digested.

Return Value

A Promise that resolves to a new ArrayBuffer containing the digest.


import { crypto } from "k6/experimental/webcrypto";
export default async function () {
const digest = await crypto.subtle.digest("SHA-256", stringToArrayBuffer("Hello, world!"));
function arrayBufferToHex(buffer) {
return [ Uint8Array(buffer)]
.map((x) => x.toString(16).padStart(2, "0"))
function stringToArrayBuffer(s) {
return Uint8Array.from(new String(s), (x) => x.charCodeAt(0));