Use The Flickr API To Retrieve a User ID

I’ve been working on a small application that interfaces with the Flickr API in order to dynamically retrieve a stream of photos from a user’s Flickr feed.

In order to retrieve the stream, the user’s ID is required; however, most users are familiar with their Flickr username, not their ID. Services such as IDGettr can be a big help in looking up a user’s ID, but I wanted to roll something into the application that eliminated the need for a third-party service.

Assuming that you have a Flickr API Key, retrieving the user ID based on the username is easy enough.
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