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Wouldn't it be better to use a JSON Schema validator in this case?

Well you need both right, the Typescript interface and the JSON Schema? There's still the possibility of a mismatch there.

Then you're maintaining two definitions - typescript ones and json schema ones. But thanks for the idea :)

Well, you could have one or the other and then just convert a schema to an Interface [1], or vice versa [2].

The reason I like schema-first is because a schema allows you to be way more strict about what's accepted in most cases, e.g. validating an entry via RegEx. It tends to make APIs safer and runtime errors more clear.

[1] https://github.com/bcherny/json-schema-to-typescript

[2] https://github.com/YousefED/typescript-json-schema

You could write the runtime definition and extract the static types from that https://github.com/gcanti/io-ts

thanks for the link - i've never seen that before :)

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