MQTT.js

Works seamlessly across Node.js, browsers, React Native, and mini-programs like WeChat and Ali, with dedicated protocol support (e.g., wxs, alis) as documented in the README.

Offers configurable automatic reconnection with hooks like transformWsUrl for refreshing authentication tokens, ensuring reliable connectivity in unstable networks.

Supports MQTT 5.0 features like topic alias management and custom properties, along with QoS 0-2, providing flexibility for optimized messaging workflows.

Rewritten in TypeScript from v5.0.0, with built-in type definitions that enhance developer experience through autocompletion and error checking.

Provides both callback-based and promise-based async methods (e.g., publishAsync, subscribeAsync) for publishing and subscribing, catering to different coding styles.