JSONrpsee is a cutting-edge JSON-RPC library meticulously engineered for the Rust programming language, utilizing async/await for enhanced performance. As the intended successor to ParityTech’s JSONRPC crate, JSONrpsee offers robust client and server support for both HTTP/HTTP2 and WebSocket protocols, alongside versatility in transport abstraction and extensibility via middleware. The library provides specialized features such as client support for WASM through web-sys, streamlined API generation using procedural macros, and advanced configuration options like dual-stack (v4/v6) WebSocket servers. Comprehensive API documentation, varied usage examples, and ongoing development milestones underline its commitment to delivering a stable v1.0 release. With a growing user base including notable projects like Polkadot SDK and zkSync Era, JSONrpsee is geared to serve as a pivotal tool in the Web3 ecosystem. Benchmarks illustrating its performance are regularly updated and publicly accessible.