When you enter this part of Jakarta, there are almost no clubs for foreigners.
Most venues in that area are targeting male clients with sexy dancers, massage rooms, karaokes, etc. Pecenongan (Emporium, Velvet Bar, Goldmine, Tease Club, Classic Club) Kota (Old Town, Colosseum, 1001) Lokasari and Mangga Besar (Mille's, Newton, Haze Karaoke, Travel Hotel, Exotis, Pujasera) Gadjah Mada (Malioboro, V2) Hayam Wuruk (Illigals, Stadium, Emerald Disco) Ancol and Mangga Dua (Hotel Alexis, Segarra, Fashion Hotel, M-Star) Kota Indah (also called Peng-J with some massage parlours and disco-bars) Taman Anggrek (mostly massage parlours), Pluit and PIK (many cafés and small bars), Kelapa Gading (spas and karaokes).
Apart from that, the reputation of Kota as a dangerous area in Jakarta is over-exaggerated, especially if you compare it to the dangerous areas in western countries, where you would never walk alone.
Clubs in North Jakarta ALWAYS have prostitutes, usually a combination of freelance prostitutes and girls under contracts.
Generally speaking, the norther you go, the more prostitutes and the more drugs you will find.