JSON:API
A specification for building JSON APIs
...It specifies how to represent resources, relationships, pagination, sorting, filtering, and metadata in a predictable way. Clients and servers that follow the spec can interoperate seamlessly without custom glue code for every new service. JSON:API also emphasizes efficiency, recommending ways to reduce payload size and minimize the number of requests. Over time it has become a widely adopted contract for RESTful APIs, helping teams save time and avoid fragmentation across microservices and third-party integrations.