> 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

Developers can send all the layer3 transactions to the zkLink and get the associated information from zkLink. zkLink also push the transaction state update via websocket to dApp.