Willian Jose led Socieded, who fell off the top spot after Wednesday’s game, when he hit in a Cristian Portu cross halfway through the first half.
But Barcelona responded quickly as Scotland fired a shot into the top corner before setting up De Jong just before half-time after a VAR inspection.
“We were intense, we put them under a lot of pressure and ran ourselves into the ground.”
“Real Sociedad are excellent at the ball but we kept attacking them, we put pressure on them as well. It was an open game because our opponents know how to play to good game but we owned the game and it was a well deserved win. “
Barcelona face Valencia next Saturday, while Sociedad travel to Levante, a side that has gone nearly four weeks without a win.