Linking mean-stack to ionic

Hey I’m very new to app creation and have been working with ionic for about a month now and I was wondering how do I get my application so that I can retrieve and send information to ionic through a mean stack. I’ve came across alot of tutorials on how to create a mean stack but not how to get the information to and from ionic.

ex. I would like my login (standard ionic login) to query the username and password.

ex2. i would like to post data from my mongodb to ionic (already know how to do the mean stack really need help with linking it)

I hope I’m being clear and thank you for your responses.

you can link your app to mean stack through rest API, so try to google rest api + name of whatever framework you use for your meanstack application (express/…)