n8n-io/n8n · error · ExpressionExtensionError

Unknown algorithm ${algorithm}. Available algorithms are: ${

Error message

Unknown algorithm ${algorithm}. Available algorithms are: ${SupportedHashAlgorithms.join()}, and Base64.

What it means

`.hash(algorithm)` supports exactly `md5`, `sha1`, `sha224`, `sha256`, `sha384`, `sha512`, `sha3` (mapped to SHA3-512), and `base64`. The algorithm is lowercased before the switch, so case is not the issue — an unsupported NAME is. Anything else hits the `default` branch and throws, listing the valid set.

Source

Thrown at packages/@n8n/expression-runtime/src/extensions/string-extensions.ts:112

		case 'sha1':
		case 'sha224':
		case 'sha256':
		case 'sha384':
		case 'sha512':
		case 'sha3':
			const variant = (
				{
					sha1: 'SHA-1',
					sha224: 'SHA-224',
					sha256: 'SHA-256',
					sha384: 'SHA-384',
					sha512: 'SHA-512',
					sha3: 'SHA3-512',
				} as const
			)[algorithm];
			return new SHA(variant, 'TEXT').update(value).getHash('HEX');
		default:
			throw new ExpressionExtensionError(
				`Unknown algorithm ${algorithm}. Available algorithms are: ${SupportedHashAlgorithms.join()}, and Base64.`,
			);
	}
}

function isEmpty(value: string): boolean {
	return value === '';
}

function isNotEmpty(value: string): boolean {
	return !isEmpty(value);
}

function length(value: string): number {
	return value.length;
}

export function toJsonString(value: string): string {

View on GitHub (pinned to 5ac6606e81)

Solutions

1. Use one of the listed algorithms (`md5`, `sha1`, `sha224`, `sha256`, `sha384`, `sha512`, `sha3`, `base64`).
2. If you need an unsupported digest, compute it in a Code node with `node:crypto`.
3. For Base64 encoding specifically, pass `'base64'` rather than a hash name.

Example fix

// before
{{ $json.s.hash('crc32') }}
// after
{{ $json.s.hash('sha256') }}

const ALGOS = new Set(['md5','sha1','sha224','sha256','sha384','sha512','sha3','base64']);
const algo = String($json.algo || '').toLowerCase();
if (!ALGOS.has(algo)) {
  throw new Error(`hash(): unsupported algorithm '${algo}'`);
}
return $json;

const isSupportedHash = (a: string): a is 'md5'|'sha1'|'sha224'|'sha256'|'sha384'|'sha512'|'sha3'|'base64' =>
  ['md5','sha1','sha224','sha256','sha384','sha512','sha3','base64'].includes(a.toLowerCase());

When it happens

Trigger: `.hash('crc32')`, `.hash('md4')`, `.hash('sha128')`, `.hash('ripemd160')`.

Common situations: Asking for a hash n8n does not bundle; typo in the algorithm name; assuming the full jsSHA catalogue is exposed.

Related errors

• removeFieldsContaining(): expected non-empty string arg
• argument of keepFieldsContaining must be a non-empty string
• intersection(): expected array arg, e.g. .intersection([1, 2
• Unsupported unit '${String(errorUnit)}'. Supported: ${durati
• keys and values must be arrays

AI-assisted analysis of n8n-io/n8n@5ac6606e81 (2026-08-12). Data as JSON: /api/errors/e299a3d684ba43d6. Report an issue: GitHub.