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We built something like this. SDK you can drop into your API code, then we generate an OpenAPI spec based off of your traffic. Demo here: https://www.loom.com/share/c5b242d25de84e1d95b03fd35eab7099

Are there APIs you have in mind?

One tool we have under development is a tool (might end up being a chrome extension) that will analyze web requests to turn them into a spec.

There are a few tools that are similar in purpose, though I've only seen ones based on proxying, rather than chrome's network request recording.

Swagger does a good job of this with a little help from decorators in Typescript