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When I write about working with APIs, I often get back questions about authenticating with OAuth. Today, I wanted to show you how to use OAuth with fetch() in vanilla jS. An example To help this all click, let’s work with a real example: the Petfinder API. To work along with me, you’ll first need to create an account and get an API key and secret. The Petfinder API can be used to get a list of adoptable pets for a specific shelter (or by animal type or breed).