Validation code as shown tends to be repetitive and imperfectly implemented. I have found that transitioning to using AJV and JSON Schema is far more sustainable, especially on an API surface. One describes the data and depends on consistent and vetted logic for validating the described types rather than repetitively describing how to validate them.
Validations that happened at an application level must still be written but those tend to be specific to the application logic or system state. An example of logic related validation is contingently valid argument values where the compatibility of one value being used with another must be tested. An example of state related validation is a constraint that a given value must exist in a dynamic table.
Validations that happened at an application level must still be written but those tend to be specific to the application logic or system state. An example of logic related validation is contingently valid argument values where the compatibility of one value being used with another must be tested. An example of state related validation is a constraint that a given value must exist in a dynamic table.