Look at GraphQL. It lets you enforce a single schema from the front end down to the data layer. In my company's product, we specify the data models as JSON Sch

Look at GraphQL. It lets you enforce a single schema from the front end down to the data layer. In my company's product, we specify the data models as JSON Schema, and then generate the necessary language code -- we generate the GraphQL schema from it as well as Go data types, with some database glue. Our front end code is currently JavaScript, but we hope to migrate to TypeScript, which will make everything statically types all the way through. (gRPC fills a similar role, though the web story is lacking. gRPC is brilliant for APIs between backend services, but browser support is not there yet. GraphQL is more convenient for the app-facing layers.)