A 401 from APITemplate.io points first to the credential: its API reference describes 401 as an incorrect API key. Copy the intended key from the console’s API Integration area, then check that the actual request sends it in the documented X-API-KEY header. Also verify that the key is populated at runtime, belongs to the right personal or team scope, and is being sent to the intended API endpoint and version.
What a 401 means in APITemplate.io
APITemplate.io’s API Reference error table says: “401 | Unauthorized — Your API key is wrong.” That wording appears in its legacy v1 reference, so treat it as the direct clue to investigate credentials, not as proof that every current endpoint behaves identically. Current key-management documentation shows X-API-KEY as the standard header for REST calls, SDKs, and third-party integrations. See APITemplate.io API key documentation and the legacy API reference.
Start with the request that actually left your application. A key displayed correctly in a workflow editor or local settings does not help if the runtime sends an empty value, an old secret, or a placeholder. A 429 is different: APITemplate documents it as a rate-limit response, so retrying or adjusting request volume—not changing credentials—is the relevant path for that status.
Fix the credential and header first
- Copy the intended key. Sign in to the APITemplate console and open API Integration. Copy the key instead of retyping it. Personal and team API keys are separate; select the one with the scope intended for this integration. The key documentation covers key management.
- Check the transmitted header. The current documented setup is
X-API-KEY: YOUR_API_KEY. Inspect the final outgoing request, SDK settings, proxy configuration, or workflow execution data. Confirm the header name and that its value is populated with the real key when the request runs. - Remove placeholders and stale secrets. Check for an unset environment variable, a copied example value, whitespace introduced during secret handling, or a key that was rotated without updating the application. Do not print the real key in public logs or commit it to source control.
- Verify the endpoint and version. Current v2 REST documentation illustrates regional endpoints, while older v1 examples use
api.apitemplate.io. Use the endpoint intended for your integration and API version rather than copying an old sample mechanically. See the current REST API documentation and APITemplate.io troubleshooting guidance.
Set the API key in n8n
APITemplate.io’s n8n integration guide uses Header Auth. In n8n, create or select a Header Auth credential, set the header name to X-API-KEY, and enter the real API key as the value. Attach that credential to the APITemplate HTTP Request node. Then inspect the node’s execution details to confirm the credential is attached and the request is being sent to the correct endpoint. Do not paste a live key into screenshots or shareable workflow exports. Follow the vendor’s n8n integration guide.
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Which authentication header should you use?
APITemplate’s API reference also documents Authorization: Token [API_KEY] as an alternative. The current getting-started and n8n instructions use X-API-KEY, so use that unless your client or integration has deliberately been configured for the alternative. Do not send both headers as a routine fix; make the request match the documented configuration for your chosen client. See the API reference.
Handle a potentially exposed key
If the key may have appeared in a public repository, a shared log, or an exposed workflow, regenerate it from the API Integration area and replace the stored secret in every application that uses it. APITemplate’s security policy says API logs are retained for up to 14 days and can be disabled in API Integration; it does not establish that logs can be selectively erased. Consult the security policy before changing logging settings.
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Distinguish authentication errors from rate limits
If the response is 429 rather than 401, investigate request rate or concurrency instead of rotating a valid key. APITemplate’s current REST documentation lists limits of 100 requests per 10 seconds per IP address and 100 concurrent synchronous PDF-generation requests per user account. These are service limits, not explanations for a 401, and limits can change; confirm them in the current API documentation when diagnosing a live integration.
When the 401 persists
- Confirm the request method, endpoint, and API version against the current documentation.
- Capture the response status and inspect redacted outgoing headers to verify the key header is present without disclosing its value.
- Check whether a proxy, secret manager, or workflow credential layer is replacing or dropping the header.
- Consult the current API documentation, check APITemplate.io service status, or contact hello@apitemplate.io. Include the status code, request method, endpoint/version, and redacted headers; never send the API key itself. See the vendor’s support page.
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Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Frequently Asked Questions
Where do I find my APITemplate.io API key?
Sign in to the APITemplate console and open API Integration. Copy the key for the intended personal or team scope.
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Does a 429 mean my APITemplate API key is wrong?
No. APITemplate documents 429 as a rate-limit response; a 401 is the status associated with authentication in its legacy error table.
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