crossbario/crossbar

Health v2 · maintenance only

Flags: no_license

Adoption not part of the score

2064 stars · 278 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

Crossbar.io is an open-source application router implementing the WAMP protocol over WebSocket, plus REST/HTTP and MQTT bridging, for building distributed and microservice applications. It provides pub/sub and routed RPC messaging with a scalable, secure networking stack.

Use cases

• route pub/sub and RPC messages between microservices
• build real-time applications with WebSocket messaging
• bridge MQTT and REST clients to a WAMP network
• self-host a message broker for distributed apps
• connect frontend and backend services over WAMP

When to choose

• you need WAMP pub/sub and routed RPC in a polyglot microservice architecture
• you want a single router bridging WebSocket, MQTT, and REST/HTTP
• you need a scalable, self-hosted real-time messaging backbone

When to avoid

• you only need simple REST APIs without pub/sub or RPC
• you are locked into a broker like Kafka or RabbitMQ for event streaming
• you need a lightweight embedded message bus rather than a standalone router

Facets

service · maturity active

message-queue websocket rpc http-server middleware routing microservices web-development backend python cross-platform self-hosted wamp pubsub mqtt rest-bridge application-router microservices messaging real-time linux docker

Member repositories

For agents

markdown · JSON · MCP: product_card(name="crossbario/crossbar")