> For the complete documentation index, see [llms.txt](https://docs.fractalworks.io/joule/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.fractalworks.io/joule/developer-guides/api-endpoints/data-access-api/websocket.md).

# WebSocket

## Overview

The Websocket API allows developers to subscribe to processed events from a Joule process. This is useful for validating processing streams.

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{% openapi src="/files/GlCtcBKC4vfe3SdDJyJ9" path="/joule/ws/stream/{topicId}" method="get" %}
[swagger-docs.json](https://3062398388-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FUU6FZlV07ZD90OzbzGww%2Fuploads%2FwsbKvpoD11cLGV2xB6Dl%2Fswagger-docs.json?alt=media\&token=7d415513-0de4-40a2-9b02-d35b6d39c86f)
{% endopenapi %}