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.
It is partially true: In this area, you will see that people outside the clubs are more annoying and aggressive.
They will try to get money from you one way or another, asking you the more often for parking money (they make sure nothing happens to your car while you park) and taxi money (they stop the taxi for you. Avoid that by walking away a few 100 meters, otherwise pay something like rp2000).
Generally speaking, the norther you go, the more prostitutes and the more drugs you will find.
Many Jakartans never venture in North Jakarta because it has a very bad reputation and it is considered as dangerous.
In Blok M, the Falatehan street is a small red light district aimed at expats and sex tourists.
Many expats live in Kemang though so there are some decent expat bars and small clubs.In the north, you also have to be very careful with taxis.You will discover many taxis' names you had never heard before, and most of them try to copy the appearance of the trusted Blue Bird or Express.Drugs, mostly ecstasy, crystal meth (shabu-shabu, called yaba in Thailand) and heroin (putau in Indonesian) are very common in Kota, to a point you cannot even begin to comprehend.In some clubs, everyone is on pills, for instance in Sydney 2000. South of Monas, you have a majority of upmarket classy clubs and bars, though not only.