I wonder how to add hundreds of users into a group? Is there any api?

[Alienazk]

Thank you! It sounds good.
Finally I chose to export the topic and then do something with the json file.

Move topics from one Discourse instance to another

Need to move some stuff from one instance of Discourse to another? There is a command line tool to export a topic, a set of topics, or an entire category, and another to import them in at the other end. Topic Export/Import one or more topics and their replies the users who posted in the topic Category Export/Import the category and all its subcategories its security settings custom groups mentioned in the security settings if any of the groups have ‘membership requests’ enable…