[Cannabat]

TS is a pain with JSON Schema or OpenAPI because it doesn't directly support things like integer or precision. TS does not easily support things like `"exclusiveMinimum": 5`, `"type": "integer"` or patterned (regex) fields.

So if you want to convert your TS interfaces to JSON Schema, you may need to provide additional constraints via JSDoc and use a generator that understands those annotations. But your TS interfaces cannot express those constraints directly.

There are a number other related complications surrounding these more expressive schema definitions - like building types from them and interacting with them at runtime.

[pcthrowaway]

You can easily express constraints like these with Zod though (created by the same person who created tRPC v1)

[Cannabat]

Sure, if you have TS in your backend. There are OpenAPI to zod generators that can help get you started, even if they don’t give you perfect zod schemas out the gate.