What do you mean by schema? JSON supports schema with libraries included in most popular languages nowadays. https://json-schema.org/ https://json-schema.org/

What do you mean by schema? JSON supports schema with libraries included in most popular languages nowadays. https://json-schema.org/ https://json-schema.org/ For numeric types, if you handle integer larger than 2 billions or floating numbers where the precision is critical (that's where json fails), these can and should be represented as string. I don't think there is any common format that guarantees large numbers and/or arbitrary precision to be encoded and decoded properly across languages and platforms.