The X-Powered-By header can give malicious actors a clue about the software stack in use, informing them of attack algorithms that are likely to succeed. The Hide Powered-By submodule for Helmet simply removes that header.
Express can disable this feature on its own:
app.disable('x-powered-by')
Or you can use Helmet to do so:
app.use(helmet.hidePoweredBy())
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