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The 27-year-old defenseman had 18 points (seven goals, 11 assists) in 81 games with the New Jersey Devils and one assist in five Stanley Cup Playoff games. He played three seasons with New Jersey after signing as a free agent July 1, 2015.
"The skating component with John's game, he's a bigger player," Bruins general manager Don Sweeney said. "The last two years in the playoffs we've run through [defensemen], it was 10 two years ago, we went through all eight this year, Brandon [Carlo] hasn't even had a chance to play in the playoffs. I just think the makeup of our group, we felt that the opportunity to add a player of that nature will fit into the way [coach Bruce Cassidy] wants to play, getting back to retrieve pucks, to be able to defend with his feet against faster, bigger, stronger players complements the group that we have."
The Columbus Blue Jackets selected Moore in the first round (No. 21) of the 2009 NHL Draft. He has 99 points (32 goals, 67 assists) in 447 NHL games with the Devils, New York Rangers, Arizona Coyotes and Blue Jackets, and has four assists in 38 playoff games.
Boston had seven defensemen who played at least 38 games last season.
"It may seem congested as we sit today, but to tell you the truth we're really happy because when you get into the year and you're wondering, 'OK where does that guy come from?'" Sweeney said. "Now you've got to go find him and acquire him and what that acquisition costs ... this is a unique time of the year when you're able to put players on your roster that you think can fill needs."
