How to merge duplicate objects by picking event from json and delete other duplicates

Im new with typescript so please be patient with me XD

I´ve got a problem with following:

I need to to read a json file from an other class and have to display it in my html file.

The json file consists from duplicate events. Every duplicated event has to be displayed and the user has to chose the right one by clicking on them.

After this the not selected events should automatically be removed.

Hope you can help me