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This is why I originally started a project to convert ts to json schema; https://github.com/YousefED/typescript-json-schema (and also check out a good alternative https://github.com/vega/ts-json-schema-generator)

You can write validation schemas using zod library [1]. They end up looking pretty similar to typescript definitions (same vocabulary, same methods for combining/intersecting/filtering). And if you migrate to typescript you'll get type definitions for free out of those schemas.

[1] https://github.com/colinhacks/zod

If you like zod, you should check out myzod: https://github.com/davidmdm/myzod

you might like https://jsontypedef.com/ if you haven't seen it