Channels WebSocket wrapperΒΆ

Channels ships with a javascript WebSocket wrapper to help you connect to your websocket and send/receive messages.

First, you must include the javascript library in your template; if you’re using Django’s staticfiles, this is as easy as:

{% load staticfiles %}

{% static "channels/js/websocketbridge.js" %}

If you are using an alternative method of serving static files, the compiled source code is located at channels/static/channels/js/websocketbridge.js in a Channels installation. We compile the file for you each release; it’s ready to serve as-is.

The library is deliberately quite low-level and generic; it’s designed to be compatible with any JavaScript code or framework, so you can build more specific integration on top of it.

To process messages:

const webSocketBridge = new channels.WebSocketBridge();
webSocketBridge.listen(function(action, stream) {
  console.log(action, stream);

To send messages, use the send method:

webSocketBridge.send({prop1: 'value1', prop2: 'value1'});

To demultiplex specific streams:

webSocketBridge.demultiplex('mystream', function(action, stream) {
  console.log(action, stream);
webSocketBridge.demultiplex('myotherstream', function(action, stream) {, stream);

To send a message to a specific stream:'mystream').send({prop1: 'value1', prop2: 'value1'})

The WebSocketBridge instance exposes the underlaying ReconnectingWebSocket as the socket property. You can use this property to add any custom behavior. For example:

webSocketBridge.socket.addEventListener('open', function() {
    console.log("Connected to WebSocket");

The library is also available as a npm module, under the name django-channels