How to reset preferences

If you experience certain errors and strange behavior, it might be caused by inconsistencies in the program settings. In order to reset everything, you need to rename or delete the preferences folder. This way, JOSM will behave just like you have installed it the first time.

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Locate the settings folder

Windows

Open an explorer window and type:

%APPDATA%

in the location bar and press enter. You should find a folder called JOSM.
Alternatively, try to search for the term JOSM or browse the usual folders, that contain program settings.

Linux and Mac

The settings folder is in your home directory:

~/.josm

Java preference folder option

Alternativly, it is possible to set the preference folder at start up on the console with

-Djosm.home=

e.g.

java -Xmx1000m -Djosm.home=$HOME/.josm-latest -jar josm-latest.jar