> For the complete documentation index, see [llms.txt](https://docs.zk.link/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.zk.link/developer/json-rpc-and-websocket-and-kafka.md).

# JSON RPC & Websocket & Kafka

- [JSON-RPC API](https://docs.zk.link/developer/json-rpc-and-websocket-and-kafka/json-rpc-api.md)
- [JSON-RPC Errors](https://docs.zk.link/developer/json-rpc-and-websocket-and-kafka/json-rpc-errors.md)
- [Websocket](https://docs.zk.link/developer/json-rpc-and-websocket-and-kafka/websocket.md)
- [Kafka](https://docs.zk.link/developer/json-rpc-and-websocket-and-kafka/kafka.md)