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Hey, this is really cool! Cross-language validation of data types is such a pain. This looks really well-done.

This could be useful as a build tool plugin to generate consistent typings for frontend and backend code. Of course, using this as a build-time codegen tool means you can't add any custom annotations or methods etc., so it could be a bit restrictive for most use cases.

Nice work though!

The only problem I see with this is that it doesn't have support for optional types. This is nice to be able to distinguish between null/empty fields and defaults. But this is very nice work regardless and will be useful in.many people's usecases.

Yes, it does have support for optional types. See the evolution fields in the Pokedex sample! Output in TypeScript or Swift to make this clearer (some languages don't have built-in types or syntax for nullable types).

Looks like a lot of work went into this, at first I didn't understand where it would be valuable.

Then I clicked on the "multiple" tab, and I kinda get it. Throw a bunch of data at it and it will build your types.

I've just started using typescript so will give the vscode a go.

Awesome! Thanks for trying it out, the VS Code extension is brand new and we've not had much feedback.

Quicktype – Beautiful types from JSON