It is now wise to carry a decoy wallet to throw as a tasty bone to men who may extort you to give them money on the street. Throw in a couple of kid's photos, receipts, an expired credit card or two to make it look like a real wallet. Don't wear any flashy body jewelry or an expensive watch. Choose one that can fit comfortably under your clothes. The best one is an actualy belt with a zipper, behind which you insert folded high-deonomication bills.
Taxis are safer than taking public transportation or walking, and they are cheap.
In the present crises you can catapult yourself across the whole city of Jakarta for only a few dollars. Try to flag down only light blue Blue Bird taxis, particularly after 9 pm. Admittedly, Blue Birds may not pass by that frequently while standing on a busy street but you can always have a hotel or other business call them. If you can t find a Blue Bird, call a Silver Bird, a fleet of black, luxurious taxis owned by the same company.