Add SearchApi tool documentation

Author: SebastjanPrachovskij

docs/advanced-ai/langchain/langchain-n8n.md

@@ -156,6 +156,7 @@ Utility tools.
 
 * [Calculator](/integrations/builtin/cluster-nodes/sub-nodes/n8n-nodes-langchain.toolcalculator/)
 * [Code Tool](/integrations/builtin/cluster-nodes/sub-nodes/n8n-nodes-langchain.toolcode/)
+* [SearchApi](/integrations/builtin/cluster-nodes/sub-nodes/n8n-nodes-langchain.toolsearchapi/)
 * [SerpAPI](/integrations/builtin/cluster-nodes/sub-nodes/n8n-nodes-langchain.toolserpapi/)
 * [Vector Store Tool](/integrations/builtin/cluster-nodes/sub-nodes/n8n-nodes-langchain.toolvectorstore/)
 * [Wikipedia](/integrations/builtin/cluster-nodes/sub-nodes/n8n-nodes-langchain.toolwikipedia/)

docs/integrations/builtin/cluster-nodes/sub-nodes/n8n-nodes-langchain.toolsearchapi.md

@@ -0,0 +1,40 @@
+---
+#https://www.notion.so/n8n/Frontmatter-432c2b8dff1f43d4b1c8d20075510fe4
+title: SearchApi
+description: Documentation for the SearchApi node in n8n, a workflow automation platform. Includes details of operations and configuration, and links to examples and credentials information.
+priority: high
+---
+
+# SearchApi
+
+The SearchApi node allows an agent in your workflow to call Google, Bing, Baidu, Google News, YouTube APIs.
+
+On this page, you'll find the node parameters for the SearchApi node, and links to more resources.
+
+/// note | Credentials
+You can find authentication information for this node [here](/integrations/builtin/credentials/searchapi/).
+///
+
+--8<-- "_snippets/integrations/builtin/cluster-nodes/sub-node-expression-resolution.md"
+
+## Node options
+
+* **Engine**: defines an engine that will be used to retrieve real-time data. Refer to [documentation](https://www.searchapi.io/docs/google) for all available engines.
+* **Country**: refer to [Google GL Parameter: Supported Google Countries](https://www.searchapi.io/docs/parameters/google/gl){:target=_blank .external-link} for supported countries and country codes.
+* **Device**: the device to use to get the search results.
+* **Google Domain**: refer to [Supported Google Domains](https://www.searchapi.io/docs/parameters/google/domain) for supported domains.
+* **Language**: refer to [Google HL Parameter: Supported Google Languages](https://www.searchapi.io/docs/parameters/google/hl){:target=_blank .external-link} for supported languages and language codes.
+* **Video ID**: defines the video you want to search. Usable only with `youtube_transcripts` engine.
+* **Lang**: defines language for transcripts. Usable only with `youtube_transcripts` engine.
+
+## Templates and examples
+
+<!-- see https://www.notion.so/n8n/Pull-in-templates-for-the-integrations-pages-37c716837b804d30a33b47475f6e3780 -->
+[[ templatesWidget(title, 'searchapi') ]]
+
+## Related resources
+
+Refer to [SearchApi's documentation](https://www.searchapi.io/){:target=_blank .external-link} for more information about the service. You can also view [LangChain's documentation on integration](https://js.langchain.com/v0.2/docs/integrations/tools/searchapi/){:target=_blank .external-link}.
+
+--8<-- "_snippets/integrations/builtin/cluster-nodes/langchain-overview-link.md"
+--8<-- "_glossary/ai-glossary.md"

docs/integrations/builtin/credentials/searchapi.md

@@ -0,0 +1,36 @@
+---
+#https://www.notion.so/n8n/Frontmatter-432c2b8dff1f43d4b1c8d20075510fe4
+title: SearchApi credentials
+description: Documentation for the SearchApi credentials. Use these credentials to authenticate SearchApi in n8n, a workflow automation platform.
+contentType: integration
+priority: high
+---
+
+# SearchApi credentials
+
+You can use these credentials to authenticate the following nodes:
+
+* [SearchApi](/integrations/builtin/cluster-nodes/sub-nodes/n8n-nodes-langchain.toolsearchapi/)
+
+## Prerequisites
+
+Create a [SearchApi](https://www.searchapi.io/){:target=_blank .external-link} account.
+
+## Supported authentication methods
+
+- API key
+
+## Related resources
+
+Refer to [SearchApi's API documentation](https://www.searchapi.io/docs/google){:target=_blank .external-link} for more information about the service.
+
+## Using API key
+
+To configure this credential, you'll need:
+
+- An **API Key**
+
+To get your API key:
+
+1. Go to **Your Account >** [**API Key**](https://www.searchapi.io/api_tokens){:target=_blank .external-link}.
+2. Copy **Your Private API Key** and enter it as the **API Key** in your n8n credential.