Errors

How to handle errors

Agenzia per l'Italia Digital & Team per la trasformazione digital (Italian administration) - Interoperability model for the Public Administration

Use the Problem JSON scheme for error responses

Deliveroo - API Design

Return codes and errors

Haufe - Haufe API style guide

Error handling

Microsoft - Microsoft REST API Guidelines

Errors
Faults
Long running API faults
Silent Fail Rule
Unsupported requests

adidas - adidas API design guidelines

Problem Detail
application/problem+json
Error Response Format
application/problem+json