Many application developers are API builders in one way or another. Whether they are building APIs for 3rd party integrators, user interfaces, or a...
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An interesting approach that takes this idea a step further: write the core sample data, and generate the API spec from there. This provides an even more concise format to flesh out the the API spec and is useful as fixtures for testing as well.
Stripe is the best example of providing simple and concise API documentation.