Joselu marked his first start for Newcastle with a goal as Rafael Benitez was finally able to celebrate a first win of the season.
The Spanish striker converted Christian Atsu's 36th-minute cross to lift the mood at St James' Park, and defender Ciaran Clark and substitute Aleksandar Mitrovic sent the locals among a crowd of 52,093 home happy with second-half strikes.
It was exactly was the promoted Magpies needed after weeks of claim and counter-claim on Tyneside and ahead of a hugely important final few days of the transfer window.
By contrast, Hammers boss Slaven Bilic, the subject of reports that Benitez is being lined up to replace him, left the north-east reflecting on a third successive Premier League defeat and with a deepening gloom surrounding his own club.
Newcastle United 3-0 West Ham United
