n8n-io/n8n · warning · BadRequestError

Invalid Credential type

Error message

Invalid Credential type: "${credentialType}"

What it means

The credential-translation endpoint validates the requested credential type against registered credential types via credentialTypes.recognizes(credentialType). An unrecognized type is rejected with 400 BadRequestError, echoing the supplied value.

Solutions

1. Verify the credential type is installed and loaded (check the node/credential registry).
2. Correct the query param spelling/casing to match the registered type exactly.
3. If a custom credential, ensure the node package is installed and registered before the request.

// Confirm the type is registered before requesting its translation.
async function isKnownCredentialType(listCredentialTypes, type) {
  const known = await listCredentialTypes();
  return known.includes(type);
}

function isRegisteredCredentialType(type, knownTypes) {
  return typeof type === 'string' && Array.isArray(knownTypes) && knownTypes.includes(type);
}

try {
  await api.get('/credential-translation', { params: { credentialType } });
} catch (e) {
  if (e.status === 400 && /Invalid Credential type/.test(e.message)) {
    // fix the type name/casing or ensure the credential is loaded, then retry
  } else { throw e; }
}

When it happens

Trigger: GET /credential-translation?credentialType=Foo where 'Foo' is not a registered/loaded credential type.

Common situations: Typo in the query param; a community/custom node providing the credential is not installed or failed to load; the credential type was renamed across versions; calling before nodes-base finished loading.

Related errors

• 0
• 400
• 400
• Azure AI Search endpoint is missing or invalid
• Expected Supabase credentials host to be a string

AI-assisted analysis of n8n-io/n8n@5ac6606e81 (2026-08-12). Data as JSON: /api/errors/ab366d4996380086. Report an issue: GitHub.

Appendix: source

Thrown at packages/cli/src/controllers/translation.controller.ts:31

export const NODE_HEADERS_PATH = safeJoinPath(NODES_BASE_DIR, 'dist/nodes/headers');

export declare namespace TranslationRequest {
	export type Credential = Request<{}, {}, {}, { credentialType: string }>;
}

@RestController('/')
export class TranslationController {
	constructor(
		private readonly credentialTypes: CredentialTypes,
		private readonly globalConfig: GlobalConfig,
	) {}

	@Get('/credential-translation')
	async getCredentialTranslation(req: TranslationRequest.Credential) {
		const { credentialType } = req.query;

		if (!this.credentialTypes.recognizes(credentialType))
			throw new BadRequestError(`Invalid Credential type: "${credentialType}"`);

		const { defaultLocale } = this.globalConfig;
		const translationPath = safeJoinPath(
			CREDENTIAL_TRANSLATIONS_DIR,
			defaultLocale,
			`${credentialType}.json`,
		);

		try {
			// eslint-disable-next-line @typescript-eslint/no-unsafe-return
			return require(translationPath);
		} catch (error) {
			return null;
		}
	}

	@Get('/node-translation-headers')
	async getNodeTranslationHeaders() {

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