Instagram get username from userId

Question

I have the ability to get userId from username, but I do not have the ability to get username from userId.

I have a database of userId because that is all my app needed

Answer 1

use this API:

https://api.instagram.com/v1/users//?access_token=ACCESS-TOKEN

The response will have username and other user information, here is documentation: http://instagram.com/developer/endpoints/users/#get_users