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

# About Cognigy.AI API

The Cognigy.AI API follows a [RESTful](https://en.wikipedia.org/wiki/REST) design and uses standard HTTP methods, status codes, and authentication mechanisms.
All endpoints support JSON-encoded responses and predictable resource-oriented URLs.

### Cross-Origin Resource Sharing (CORS)

The API fully supports CORS in accordance with the [W3C specification](https://fetch.spec.whatwg.org/). All responses include a wildcard `Access-Control-Allow-Origin` header, enabling cross-domain browser requests.

### Authentication

Cognigy.AI supports the following authentication methods:

<AccordionGroup>
  <Accordion title="API Key">
    For Cognigy installations, use an [API key](/ai/administer/user-menu/my-profile#api-keys) in the request path or HTTP headers. Keep it secure and revoke it if exposed.
  </Accordion>

  <Accordion title="OAuth2">
    Use OAuth2 authentication to get an access token via the standard [OAuth2 Client Credentials](https://datatracker.ietf.org/doc/html/rfc6749#section-4.4) flow. Provide the access token in the `Authorization` header as a `Bearer` token.
  </Accordion>

  <Accordion title="BasicAuth">
    Use a username and password for API requests related to the [Management UI](/api-reference/management-ui/).
  </Accordion>
</AccordionGroup>

### Error Handling

The API uses standard HTTP status codes (400 and higher) to indicate errors. Error responses follow [RFC 7807](https://datatracker.ietf.org/doc/html/rfc7807) and include a traceId that you can provide to [Cognigy technical support](/help/get-help) for troubleshooting.

### API Server

* **Cognigy.AI API:** `https://api-trial.cognigy.ai/new/`