grafana/k6 · error

key's handle isn't a byte slice

Error message

key's handle isn't a byte slice

What it means

Error "key's handle isn't a byte slice" thrown in grafana/k6.

Source

Thrown at internal/js/modules/k6/webcrypto/jwk.go:72

	}

	if err := sk.validate(); err != nil {
		return nil, fmt.Errorf("invalid symmetric JWK: %w", err)
	}

	skBytes, err := base64URLDecode(sk.K)
	if err != nil {
		return nil, fmt.Errorf("failed to decode symmetric key: %w", err)
	}

	return skBytes, nil
}

// exportSymmetricJWK exports a symmetric key as a map of JWK key parameters.
func exportSymmetricJWK(key *CryptoKey) (*JsonWebKey, error) {
	rawKey, ok := key.handle.([]byte)
	if !ok {
		return nil, errors.New("key's handle isn't a byte slice")
	}

	// wrap result into the object that is expected to be returned
	exported := &JsonWebKey{}

	exported.Set("k", base64URLEncode(rawKey))
	exported.Set("kty", JWKOctKeyType)
	exported.Set("ext", key.Extractable)
	exported.Set("key_ops", key.Usages)

	algV, err := extractAlg(key.Algorithm, len(rawKey))
	if err != nil {
		return nil, fmt.Errorf("failed to extract algorithm: %w", err)
	}
	exported.Set("alg", algV)

	return exported, nil
}

View on GitHub (pinned to 93accf6570)

When it happens

Trigger: Thrown at internal/js/modules/k6/webcrypto/jwk.go:72 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of grafana/k6@93accf6570 (2026-08-15). Data as JSON: /api/errors/ae404d861ef618ec. Report an issue: GitHub.