The 27-year-old has made 107 appearances since joining the Canaries for an undisclosed fee from Everton in 2010, establishing himself as first choice and winning international recognition with an England debut against Italy in 2012.
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"I’ve thoroughly enjoyed my time at Norwich City - everyone has been very supportive. The whole club, the players and staff I have worked with have been fantastic.
"I’ve broken into the England squad while at Norwich, and without the opportunity they gave me I wouldn’t have been anywhere near it. I was in a bit of a no-man’s land before I joined the club, and they took a gamble on me.
"Thankfully I think it’s paid off for both sides and now I’m just looking to keep up my form."
Norwich manager Chris Hughton was relieved to secure the future of his No.1, who was subject of a bid from Chelsea in the summer.
"We’re really delighted," Hughton admitted. "We were in a position where there was some interest in him in the summer, and I think that reiterated for us what we felt about John.
"We’re really delighted that he has signed a new contract, and it’s one that’s thoroughly deserved not only for what he’s done for the club but of course with his part on the international scene with England too."