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WAMP in JavaScript for Browsers and NodeJS
JavaScript Python Other


Autobahn|JS is a subproject of the Autobahn project and provides an open-source implementation of the Web Application Messaging Protocol V2 in JavaScript

It is licensed under the MIT licensed.

WAMP provides asynchronous Remote Procedure Calls and Publish & Subscribe for applications in one protocol running over WebSocket (and fallback transports for old browsers).

Autobahn|JS runs on both Web browsers and Node.js.

WAMP enables application architectures with application code distributed freely across processes and devices according to functional aspects. Since WAMP implementations exist for multiple languages, WAMP applications can be polyglott. Application components can be implemented in a language and run on a device which best fit the particular use case.

Show me some code

The following example implements all four roles that Autobahn|JS offers

  • Publisher
  • Subscriber
  • Caller (calls a remote procedure)
  • Callee (offers a remote procedure)

The code runs unaltered in the browser or Node.js!

var autobahn = require('autobahn');

var connection = new autobahn.Connection({url: 'ws://', realm: 'realm1'});

connection.onopen = function (session) {

   // 1) subscribe to a topic
   function onevent(args) {
      console.log("Event:", args[0]);
   session.subscribe('com.myapp.hello', onevent);

   // 2) publish an event
   session.publish('com.myapp.hello', ['Hello, world!']);

   // 3) register a procedure for remoting
   function add2(args) {
      return args[0] + args[1];
   session.register('com.myapp.add2', add2);

   // 4) call a remote procedure'com.myapp.add2', [2, 3]).then(
      function (res) {
         console.log("Result:", res);

Get it

Browser Development

The latest release of AutobahnJS can be downloaded from here:

Previous releases are available under respective links containing the version number:

A complete history of AutobahnJS releases is also available from the built repository.

The latter can also be used with Bower:

bower install autobahn

NodeJS Development

AutobahnJS is available via the Node package manager here. To install:

npm install autobahn

More information

For more information, take a look at the project documentation. This provides:

Get in touch

Get in touch on IRC #autobahn on or the mailing list.


Autobahn|JS includes code from the following open-source projects

Special thanks to the Coders with an Unhealthy Javascript Obsession for creating when.js - A lightweight Promise and when() implementation, plus other async goodies.

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