> For the complete documentation index, see [llms.txt](https://doc.duaer.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://doc.duaer.com/integrations/builtin/credentials/serp.md).

# Set up SerpAPI credentials in Duaer

Store SerpAPI connection details in Duaer for digital-organization nodes to use at runtime. Secrets are protected by the instance encryption key and are not written into node parameters.
## Get a SerpApi API key <a href="#get-an-api-key" id="get-an-api-key"></a>

The Duaer SerpAPI credential needs one key:

1. Sign in to [SerpApi](https://serpapi.com/manage-api-key) and copy the key from the Api Key page.
2. Put it in API Key and save.

The credential dialog notes that the built-in Duaer SerpApi tool node is deprecated and will not be updated; use the official verified SerpApi community node instead.

## SerpAPI fields in Duaer <a href="#serpapi" id="serpapi"></a>

In Duaer, choose SerpAPI when you create a credential, then fill in these fields:

- API Key (required, secret)

Note from the dialog: This node is deprecated and will not be updated in the future. Please use the official verified community node instead.

When you save, Duaer tests the connection with these values.

Duaer nodes that use it: [SerpApi (Google Search)](/integrations/builtin/cluster-nodes/sub-nodes/n8n-nodes-langchain.toolserpapi.md).

## Save the connection in Duaer

Open Credentials and create SerpAPI. Fill in the key, OAuth, or server fields. After you save, digital-organization nodes reference this credential instead of putting the secret in a parameter.

Credential values are protected by the instance encryption key. If you change or lose that key, stored credentials cannot be decrypted. See the hosting notes on encryption keys. 

## Who can use this credential

Who can see or edit it follows projects and roles. Do not paste secrets into chat or variables. External vaults are covered under external secrets.
## Questions

### Do SerpAPI secret values appear in Duaer node parameters?

No. In Duaer, SerpAPI secrets stay in the credential. Nodes only reference the credential. Execution records should not show the plaintext secret either.

### What usually stops a SerpAPI credential from saving in Duaer?

Wrong fields, an OAuth callback that does not match the instance URL, or a role that cannot create credentials. Check the fields SerpAPI expects, then confirm you can create credentials in that project.