 On October 13, 2014, Johnson made a tackle, a pass deflection, and made his first career interception after picking off a pass attempt by Austin Davis and returning it for a 20-yard touchdown during a 31–17 win over the St. Louis Rams.During a Week 14 matchup against the Oakland Raiders, Johnson collected a season-high seven combined tackles as the 49ers lost 13–24.On December 14, 2014, he earned his first career start and recorded four combined tackles and deflected a pass in a 7–17 loss at the Seattle Seahawks.