Preferences > Advanced Preferences

Advanced preferences gives you a view of all your raw preferences data. This setting requires expert mode.

The majority of preference settings can be more easily and safely modified via the other preference panels. Normally you should not need to use this display to change settings. Do so with caution because there is no validation, and invalid or missing settings can cause unexpected errors and/or loss of data. You may be instructed to change or add settings here in order to access experimental or under-development features e.g. if somebody developed a plugin and provided a setting, but didn't get around to creating a more attractive interface for changing it.

As you can see, your preference data is composed of a set of name->value pairs. The setting names are often "namespaced" with dot ('.') separated words. Many JOSM plugins will store preferences grouped in a namespace.

Preference data is saved to a file in 'Applications Settings' folder (windows) or the hidden system folder ~/.josm (linux). You can get a similar raw view by viewing this file, but this 'Advanced' preferences panel is intended to provide a easier alternative.

Details

The list of preferences is build like this:

• First, JOSM only knows the settings from your preference file. Note that a setting is not saved in the preference file, unless the value is different from the default.
• Whenever JOSM internally requests the value of a particular setting, it remembers the key and the default value for the current session.

This means, that settings related to download may not be in the list, before you did your first download. However, if you already know the key, you can still set it explicitly.

See also

• Reset preferences

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