MQTTS (MQTT Typescript)

MQTTS is a MQTT library. It currently supports MQTT 3.1.1 but may support MQTT 5 in the future.

These are the key features:

Multiple Transports (TLS, TCP, more to come)
Focus On Extensibility
Written in Typescript
Parameterized listeners: devices/:name/color will also give you any object with the properties: {name: '...'}

Check out the example.