It is now four goals in five games for West Brom striker Daryl Dike, who is enjoying the best goalscoring run of his Albion career.
He looked a player full of confidence as he stroked home on the volley from Jed Wallace's cross.
It has been a fairly even contest so far, but Cardiff have work to do if they are to register a third straight home victory.
The Bluebirds have not come back to win a game all season.
GOAL: Huddersfield Town 0-1 Norwich City
Gabriel Sara (26 mins)
Reading have not scored in their last five away outings in the league.