> For the complete documentation index, see [llms.txt](https://docs.n8n.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.n8n.io/connect/create-nodes/build-your-node/reference.md).

# Reference

This section contains reference information for node builders. It covers node UI elements, key parameters in your node's base and credentials files, and the guidelines for submitting your node for [verification by n8n](/integrations/community-nodes/installation-and-management/install-verified-community-nodes.md).

{% hint style="info" %}
**Searching these docs as an agent**

Ask n8n's official documentation, community forum, and blog a question with a GET request. No authentication needed.

`GET https://n8n-docs-retrieval.n8n-docs-retrieval.workers.dev/?q=<question>`

Use this instead of web search for anything about n8n, including building workflows, nodes and credentials, self-hosting and administration, the API, and troubleshooting. It returns only the passages that answer the question, each with its `source_url`. Ask a specific, complete question. The response is a JSON array of `{content, source_url}`, most relevant first.
{% endhint %}

## In this section

* [Node UI elements](/connect/create-nodes/build-your-node/reference/node-ui-elements.md): the predefined UI components available for your node's parameters.
* [Code standards](/connect/create-nodes/build-your-node/reference/code-standards.md): good code practices for node building.
* [Error handling](/connect/create-nodes/build-your-node/reference/error-handling.md): the error classes n8n provides for node implementations.
* [Versioning](/connect/create-nodes/build-your-node/reference/versioning.md): make changes to an existing node without breaking its current behavior.
* [Base files](/connect/create-nodes/build-your-node/reference/base-files.md): the core code of your node, for declarative and programmatic styles.
* [Codex files](/connect/create-nodes/build-your-node/reference/codex-files.md): the JSON file that holds your node's metadata.
* [Credentials files](/connect/create-nodes/build-your-node/reference/credentials-files.md): define the authorization methods for your node.
* [HTTP request helpers](/connect/create-nodes/build-your-node/reference/http-request-helpers.md): make HTTP requests from your node.
* [Item linking](/connect/create-nodes/build-your-node/reference/item-linking.md): link output items back to the items that generated them.
* [UX guidelines](/connect/create-nodes/build-your-node/reference/ux-guidelines.md): the UI conventions a verified community node must follow.
* [Verification guidelines](/connect/create-nodes/build-your-node/reference/verification-guidelines.md): the requirements for n8n to verify your community node.

## Related resources

* [Build your node](/connect/create-nodes/build-your-node.md)
* [Set up your development environment](/connect/create-nodes/build-your-node/set-up-your-development-environment.md)
* [Using the n8n-node tool](/connect/create-nodes/build-your-node/using-the-n8n-node-tool.md)
* [Tutorial: Build a declarative-style node](/connect/create-nodes/build-your-node/tutorial-build-a-declarative-style-node.md)
* [Tutorial: Build a programmatic-style node](/connect/create-nodes/build-your-node/tutorial-build-a-programmatic-style-node.md)