Dan Alexander rushed for 208 yards and two touchdowns and Correll Buckhalter had 117 yards on 13 carries for the Huskers, who scored on their first four possessions in the season opener and didn't punt until the fourth quarter.
Nebraska wore down the smaller Spartans on an afternoon when it reached 100 degrees by the beginning of the fourth quarter and the temperature on the artificial turf was 120.
The Huskers had 596 yards of offense while winning their 15th straight opener.
Crouch, who had surgery on his throwing shoulder in January, was just 4-of-10 for 67 yards with two interceptions. But Crouch had no trouble leading the option attack and finished with 57 yards on eight carries.
The Spartans gained 346 yards and had three apparent touchdowns nullified because of penalties. Nebraska had trouble stopping Deonce Whitaker, a speedy 5-foot-6 senior, who rushed for 147 yards, 121 in the first half.
Marcus Arroyo was 10-for-23 with two touchdowns for San Jose State.
Nebraska was never threatened, but didn't put the game away until the second half when Alexander broke free on an option for a 56-yard run. Crouch added a 9-yard touchdown run late in the third for a 42-13 lead and the starting backfield was done for the day.
Crouch accounted for Nebraska's first three touchdowns with a 6-yard scoring run, a 27-yard TD pass to Tracey Wistrom and a 4-yard bootleg with about five minutes left in the second quarter. Each scoring play capped an 80-yard drive.
The Huskers' longest drive of the first half, 97 yards, opened with Buckhalter's 26-yard run and ended on a 1-yard dive by Alexander that gave the Huskers a 28-6 halftime lead.
Whitaker opened San Jose State's first possession with a 6-yard run, then sprung free for 69 yards to seup a first-and-goal from the 7, but the Huskers were able to avoid giving up a touchdown. Two penalties pushed the Spartans back, then Nick Gilliam's 29-yard field-goal attempt bounced off the right upright.
The Spartans got to the Nebraska 8 on their next possession and scored on a pass in the flat from Arroyo to An Truong that cut Nebraska's lead to 14-6 when the extra-point try was blocked.
Arroyo brought San Jose State within 35-13 on a 19-yard pass to Rashied Davis after Josh Parry's interception gave the Spartans the ball at the Nebraska 21.
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