The Node-RED editor doesn't query npm directly - it accesses a catalogue we curate on flows.nodered.org
You can provide your own catalogue in addition to the default one - some details here: https://github.com/node-red/node-red/wiki/Design%3A-Palette-Management-UI#customising-the-catalog
The runtime will still invoke npm install <modulename> regardless of the catalogue it comes from - so you'll also need to configure .npmrc to do the right thing.
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