First, the Bronx Democratic machine engineered District Attorney Robert Johnson into a comfy judgeship — while avoiding any whiff of democracy in replacing him. Now comes word of his nice pay boost.

Johnson admitted to The Post that, on top of his $174,000 judicial salary, he’ll also collect 142-grand a year as a retired DA. The combo could hit $316,000 — a hefty hike from the $190,000 he pulls now.

Nice reward for a guy who’s been DA for more than a quarter-century, amassing the lowest prosecution and worst conviction rates in the city, among other fiascos.

At the other end of the game is Judge-About-To-Be-DA Darcel Clark, now blissfully claiming she had no idea how she got handed the new job, and she’s nobody’s puppet. Right.

The double-dipping problem has an obvious fix: A law to say you can’t collect a New York government salary as well as a New York government pension.

This would also cover city Schools Chancellor Carmen Fariña, who pulls in $420,000 — a $212,000 salary and a $208,000 pension.

Yes, this reform might rob the taxpayers of the continued “service” of the likes of Johnson and Fariña. The republic would survive.