Node-RED

Node-RED is a low-code programming tool for event-driven applications. It uses a browser-based flow editor to wire together devices, APIs, and online services, making it useful for building automation and data-handling flows without writing everything from scratch.

It supports custom nodes and integrations, shared flows, and node collections through the Node-RED Library. You can install it with npm, start it with node-red, and run it from the command line. The flow editor is the main interface for building and editing applications.

Node-RED is built on Node.js and uses its event-driven, non-blocking model, which makes it suitable for running at the edge on low-cost hardware such as the Raspberry Pi as well as in the cloud. It is a project of the OpenJS Foundation, licensed under Apache 2.0, and the self-hosted runtime runs on your own environment.