# Websockets

VerneMQ supports the WebSocket protocol out of the box. To be able to open a WebSocket connection to VerneMQ, you have to configure a WebSocket listener or Secure WebSocket listener in the `vernemq.conf` file first:

```
listener.ws.default = 127.0.0.1:9001

listener.wss.default = 127.0.0.1:9002
```

Keep in mind that you'll use MQTT-over-WebSocket, so you will need a Javascript library that implements the MQTT client behaviour. We have used the [Eclipse Paho client](https://eclipse.org/paho/clients/js/) as well as [MQTT.js](https://github.com/mqttjs/MQTT.js)

You won't be able to open WebSocket connections on a base URL, always add the `/mqtt` path.


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# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.vernemq.com/1.7.1/configuration/websockets.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.