Ruddy made a name for himself in the lower leagues with Cambridge United, making his debut and saving a penalty in a 0-0 draw with Leyton Orient in May 2004.
In November of that year he was handed a trial with Manchester United before joining Everton the following summer for £250,000. Called up to the England U19 squad, he then made his Toffees debut against Blackburn Rovers in February 2006 and kept a clean sheet in a 1-0 victory.
As he learnt his trade, Ruddy played for a host of clubs on loan including Stockport, Wrexham and Bristol City, and had played for eight clubs by his 21st birthday. In 2009-10 Ruddy headed north on loan to SPL side Motherwell and his form was rewarded with an extended spell with the club which lasted the entire season.
With plenty of experience under his belt, Ruddy’s career took off following a permanent move to Norwich in July 2010, where he was immediately handed the number one shirt by then-boss Paul Lambert. He played 45 of 46 league games as the Canaries were promoted to the Premier League and in 2011-12, his displays in the Premier League earned him the club’s Player of the Year award.
England coach Roy Hodgson selected John as a member of his Euro 2012 squad, only for a broken finger to rule him out of the tournament. He went on to make his debut against Switzerland in August of that year, pulling off some key saves as England won 2-1.
Ruddy played a key role in Norwich's three seasons of Premier League football, which unfortunately ended in 2013-14. However, he helped the Canaries back into the Premier League at the first attempt, via a play-off final victory against Middlesbrough at Wembley.
Unfortunately he couldn't keep the Canaries in the top-flight in 2015-16 and having made 235 league appearances for the club, he moved on to Wolverhampton Wanderers in the summer of 2017.