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If you just want the names or values of private parameters that are currently defined for a node, rosparam can provide them directly:

$ rosparam list /roslaunch
/roslaunch/uris/host_vision_4__34552

$ rosparam get /roslaunch
uris: {host_vision_4__34552: 'http://vision-4:34552/'}

Replace the /roslaunch above with your desired node name.

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