One word answer: Types. If you dont use a language with strong type safety the benefits are less. For instance the OpenAPI3 (Swagger-NG) standard. It allows t

One word answer: Types. If you dont use a language with strong type safety the benefits are less. For instance the OpenAPI3 (Swagger-NG) standard. It allows the typing/schema'ing of the JSON bodies. It also provides a bunch of generators[1] that can be used to generate client libs. And when the languages of the client libs permit it, those libs come with lots of type safety and greatly reduce boilerplate. 1: https://openapi-generator.tech/docs/generators/ https://openapi-generator.tech/docs/generators/