[tauchunfall]

I worked on two large projects that use Zod and Protobuf to ensure schema evolution goes well with 5+ teams. Even if you have a lightweight frontend, it makes sense to use something that validates the schemas in the backend.

In the end you'll have a schema somewhere. Maybe defined in the database system, maybe defined in the models of an object-relational mapper. Since defining the schemas in database system or using object-relational mappers can cause very difficult problems in large projects we do not use it and use Zod and Protobuf instead. While I think you could even replace Protobuf completely with Zod or something similar.

There is the British Post Office scandal [1] around an IT system called Horizon (the legacy system in this case). After reading about the details I'm pretty sure something like Zod (I mean any schema validation) would have contributed to prevent this scandal. They even mentioned the lack of using a schema in the technical appendices in the court documents of the group legal action [2].

[1] https://en.wikipedia.org/wiki/British_Post_Office_scandal

[2] https://en.wikipedia.org/wiki/Bates_%26_Others_v_Post_Office...