There are three standard models of working with API schemas, in relation to the implementation: * manual: * schema is maintained manually, independent of

There are three standard models of working with API schemas, in relation to the implementation: * manual: * schema is maintained manually, independent of the implementation * usually an afterthought and used mainly for documentation * implementation-first: * schema is autogenerated from the code * used as a reference, possibly to generate clients, and often to run tests * probably the most common approach, supported by many frameworks * schema-first: * schema is maintained manually, with client and server code generated from it * very rare, but the most correct approach