# Nx Cloud Server API Reference

## OpenAPI

The nx-api has an OpenAPI `3.0.3` spec definition available at:

[https://cloud.nx.app/nx-cloud/api/definition.json](https://cloud.nx.app/nx-cloud/api/definition.json)

## Authenticating

To authenticate, you may use your tokens (accessible from Nx Cloud):

![Access tokens](/nx-cloud/reference/access-tokens.webp)

Per the spec, you use this token in the `Authentication` header.

## Swagger

You may use swagger to preview the spec and make requests. We do not serve our own swagger instance publicly, but you may use [the example swagger ui](https://petstore.swagger.io/?url=https://cloud.nx.app/nx-cloud/api/definition.json), and paste in the url to the Nx API definitions (https://cloud.nx.app/nx-cloud/api/definition.json).

![Access tokens](/nx-cloud/reference/swagger-preview.png)