crossbario/crossbar

Crossbar.io - WAMP application router

Source code at GitHub https://github.com/crossbario/crossbar

{
  "createdAt": "2013-10-14T11:10:50Z",
  "defaultBranch": "master",
  "description": "Crossbar.io - WAMP application router",
  "fullName": "crossbario/crossbar",
  "homepage": "https://github.com/crossbario/crossbar",
  "language": "Python",
  "name": "crossbar",
  "pushedAt": "2026-01-04T12:14:56Z",
  "stargazersCount": 2063,
  "topics": [
    "broker",
    "messaging",
    "mqtt",
    "networking",
    "networking-stack",
    "rest",
    "server",
    "wamp",
    "websocket"
  ],
  "updatedAt": "2026-01-17T16:40:44Z",
  "url": "https://github.com/crossbario/crossbar"
}

Crossbar.io

Decentralized Middleware

Crossbar.io is an open source networking platform for distributed and microservice applications. It implements the open Web Application Messaging Protocol (WAMP), is feature rich, scalable, robust and secure. Let Crossbar.io take care of the hard parts of messaging so you can focus on your app’s features.

Resources

Download from PyPI
Read more on the Project Homepage
Jump into the Getting Started
Read the reference Documentation
Join the User forum
Ask a question on StackOverflow
Read our Legal Notes

Docker images

JSON Schema for Crossbar.io Configuration File Format

We now have a JSON Schema file available for config.json, if you’re using VSCode you can make use of this by adding the following to your VSCode settings; (File -> Preferences -> Settings)

"json.schemas": [
    {
        "fileMatch": [
            "/config.json",
            "/.config.json"
        ],
        "url": "https://raw.githubusercontent.com/crossbario/crossbar/master/crossbar.json"
    }
],

Alternatively, the generic approach is to insert a “$schema” line at the top of your file;

{
    "$schema": "https://raw.githubusercontent.com/crossbario/crossbar/master/crossbar.json",
    "version": 2,

This file is currently experimental, but it should give you contextual auto-completion on all Crossbar config.json syntax, use CTRL+Space in VSCode to activate IntelliSense.