Tyler celebrated victory against his hometown club, 20 years after he was released by the Canaries as a schoolboy.
Twice Tyler made important saves - from Simeon Jackson in the first half and substitute Grant Holt in the second and the one time he was beaten ex-Hatter Leon Barnett's headed crashed off the post - but he was rarely troubled otherwise.
The 35-year-old said: "It's my job. The hard part about today was the emotional side, coming back here playing. It's where I started. This is where I wanted to be as a little boy playing football.
"To come back here, play, keep a clean sheet, means the absolute world to me and my family. The boys done brilliantly in front of me, limited them to two chances.
"We countered in the second half and the subs made the impact and it was a great finish."