Indonesia runs on 230 V at 50 Hz, with sockets following Types C and F. A converter can stay at home; Indonesia supplies 230 V.
The same socket system is used in South Korea, Armenia, Türkiye and Kazakhstan, so one adapter covers all of them. Watch out when moving on: Taiwan, Brunei and the United Arab Emirates use a completely different system. 17 of the 50 destinations in Asia share the plug types of Indonesia.
Protective earth
Grounded and ungrounded sockets may occur
Indonesia has sockets with a protective earth (Type F) and without (Type C). A plug that fits mechanically does not guarantee earthing.