home-assistant.io/source/_integrations/websocket_api.markdown
2023-04-22 12:20:33 +02:00

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---
title: Home Assistant WebSocket API
description: Instructions on how to setup the WebSocket API within Home Assistant.
ha_category:
- Other
ha_release: 0.34
ha_quality_scale: internal
ha_codeowners:
- '@home-assistant/core'
ha_domain: websocket_api
ha_platforms:
- sensor
ha_integration_type: system
---
The `websocket_api` integration set up a WebSocket API and allows one to interact with a Home Assistant instance that is running headless. This integration depends on the [`http` integration](/integrations/http/).
## Configuration
```yaml
# Example configuration.yaml entry
websocket_api:
```
For details to use the WebSocket API, please refer to the [WebSocket API documentation](https://developers.home-assistant.io/docs/api/websocket) .
## Track current connections
The WebSocket API provides a sensor that will keep track of the number of currently connected clients. You can add it by adding the following to your configuration:
```yaml
# Example configuration.yaml entry
sensor:
- platform: websocket_api
```
This will create a sensor called `sensor.connected_clients` whose value is the total number of connected clients.