To use JOSM to edit fosm content you will need to make the following configuration change:

  • Within JOSM go to Preferences (from the menu Select Edit/Preferences or press F12).
  • Select the Connection Settings tab, which is the second one down.
  • Change the Base Server URL from to
  • Check the "Use Basic Authentication" choice (FOSM doesn't support OAuth).
  • Change the username and password to those of your fosm account.

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