This repository helps to demo the capabilities of Tyk's Universal Data Graph. It contains instructions and documents that help to set up a full demo of the OAS to UDG data source feature.
There's a great open-source project that allows you to run mock REST APIs locally on your machine. You can find it here. Once you install it, use the db.json file attached to each example to spin up a mock API, which correlates with the rest of the example files.