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openapi-generator
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Reminder - you can find the code for this in two places: the generator in GitHub and the Postman collection in my public workspace. If you need some help getting it working, let me know - I'm always here to help!
Now that I have a solid way to make an Open API spec and get a functioning mock server, I'd like to take it a step further and generate an SDK to call it. Many developers use SDKs to communicate with their backend services, and tools like OpenAPI Generator enable them to do so without having to manually build them. OpenAPI Generator will take an API spec and compile it down into an SDK in the language of your choice, including front-end compatible languages like typescript-fetch.
After running the collection, I can see the API spec that was created and the mock server endpoint to test it. Looking at the rendered version on Swagger's OAS editor we can see pretty clearly this is a complete API that gets us exactly what we need.