Downtown Manhattan paradegoers are swapping bathroom tips, tricks and even the entry codes to enter coveted restrooms near City Hall as an estimated one million revelers packed the streets Thursday.

“How is anyone supposed to go to the bathroom at this Knicks parade especially with all the drinking!!? They’re trapped among a million people and can’t move,” one X user wrote hours ahead of the historic parade.

“Plan ahead,” the city urged fans in an Instagram post Wednesday. “No dedicated bathroom access!”

But that hasn’t stopped die-hard Knicks fans, many of whom have already been celebrating in and around the Canyon of Heroes for hours, from sharing advice — including the code for the John at a Think Coffee location on 13th Street in online forums.

“Don’t drink water or coffee that morning,” one fan advised in a Facebook post for New York Knicks fans.

“Bathroom breaks?? You wear diapers lol. Once you move from your spot it’s gone,” another said.

“If you … have [to] pee at any point I’m guessing you’re just screwed since you’re stuck where you are,” one Reddit user remarked.

“Get there early to get a spot guys,” yet another fan advised, “and don’t drink too much! Businesses don’t let you go to the bathroom down there.

“Its going to be gross,” they added, “because everyone will pee in the street.”