For doing streaming in Node-RED, I created a library[1] - it's been through exacatly one example flow[2] - for that it worked well. I've not had a use case for it, it was just an idea of mine to implement an ETL pipeline using NodeRED.

The library just uses the streaming API[3] of NodeJS - effectively converting lines of CSV (for example) into individual messages that flow through NodeRED.

NodeRED isn't great for handling large messages but perfect for directing many small messages.

[1] https://flows.nodered.org/node/@gregoriusrippenstein/node-re...

[2] https://flowhub.org/f/c520d9da20ad7f1d

[3] https://nodejs.org/dist/latest-v18.x/docs/api/stream.html