Substitute Luke Moore grabbed his first league goal of the season five minutes from time to give the Swans the three points. The win caps a memorable week for Swansea as they reached the 40-point mark just six days after securing their first major piece of silverware with Capital One Cup success over Bradford at Wembley.
Laudrup said: "There was a lot to be pleased about today. Firstly the win and secondly our attitude. I spoke in the week about the fact you sometimes see a negative reaction after a big win, but our reaction was an excellent first half where we showed lots of good touches, movement off the ball, and we created chances."
He added: "We went in at 0-0 but we deserved so much more. After that, Newcastle came into the game and had some very good chances but, like us, they did not score when they were at their best and so that late goal decided the game.
"It shows our maturity, sometimes with smaller teams when they do well and get recognition from the media you see a reaction in the game after.
"You can forget every game starts 0-0. I expected what I saw today, but I still had to say it as when you win a cup a negative reaction is normal."
Laudrup was also pleased for Moore. Moore's previous Premier League goal came almost a year ago against Manchester City, and Laudrup said: "It is good for Luke to come in and score in a very important game.
"He has helped us to reach 40 points a week after the cup win and it has made this a really great week. He has been out of the side for several weeks but when we have rotated the squad we have tended to do well."
Newcastle manager Alan Pardew, meanwhile, felt his side, who remain six points above the relegation zone, had deserved at least a point, and he said: "We are frustrated and disappointed we did not even get a draw as we more than deserved that.
"We sat off them for the first 20 minutes of the first half but we sorted that at half-time. In the second half I thought they had settled for a draw, they knew they were doing well to stay in it."