The Nets led by as many as 24 points in the fourth period while shooting a season-best 56.3 percent from the field. New Jersey also had 32 assists, the team's season high.
MarShon Brooks contributed 18 points for the Nets, Anthony Morrow had 17 and Jordan Williams had a career-high 14. It was New Jersey's 20th win of the season, leaving five NBA teams that have yet to reach that mark.
New Jersey began its next-to-last homestand in Newark. The Nets will move to Brooklyn next season.
Washington, which has lost five in a row and 10 out of 11, was led by John Wall with 18 points.