> ## Documentation Index
> Fetch the complete documentation index at: https://developer.upsun.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Upsun Cloud API

> Interact with the Upsun Cloud platform programmatically through the REST API or language-specific SDKs.

Manage projects, environments, and resources programmatically. Automate deployments, configure infrastructure, and integrate Upsun Cloud into your toolchain.

## SDKs

Official client libraries with typed methods and built-in authentication.

> [card] [PHP SDK](https://developer.upsun.com/api/sdk/php.md)
>
> Install with Composer and manage your Upsun Cloud projects from PHP applications and scripts.

> [card] [Node.js SDK](https://developer.upsun.com/api/sdk/js.md)
>
> Install with `npm` and integrate Upsun Cloud into your Node.js applications, serverless functions, or build pipelines.

## REST API

Full access to the Upsun Cloud platform over HTTP. Authenticate with API tokens and interact with any resource.

> [card] [Authentication](https://developer.upsun.com/api/rest/authentication.md)
>
> API tokens and OAuth

> [card] [Errors](https://developer.upsun.com/api/rest/errors.md)
>
> Error codes and best practices

## OpenAPI Reference

Interactive documentation for every endpoint, generated from the Upsun Cloud OpenAPI spec. Try requests directly from the browser.

> [card] [Explore the API](https://developer.upsun.com/api/rest/overview.md)
>
> Browse all available endpoints with request and response schemas, parameters, and example payloads.


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