in resolver validate an answer before sending it?

[Andrei-Stepanov]

I am sorry, I read https://www.graphql-tools.com/ all documentation a few times.
I asked on stackoverflow, discord. Useless.

May be you will be so kind to help?
How do I in resolver validate(convert) a JS object to GraphQL type?
In other words: check if JS object maps to GraphQL type defined in schema.
I want to validate in resolver, that I am going to return correct data.
I have an JS object that I want to return in resolver, that has requested fields.
If I return incorrect data according to GraphQL schema, I want to catch such errors and fix them in resolver.
This happens when graphql-server acts as proxy to other DB.
The type I want to return has around 100 fields. I see ineffective to write own validator.
Maybe there is something like dry-run reply (sorry for graphql unprofessional slang)?
Thank you.

[ardatan]

Actually GraphQL isn't working like that so you can add an extra layer to manage this validation.
Data Source -> Validation Schema with Resolvers -> Proxy schema that delegates requests to Validation Schema
Does that work for you?