Microsoft REST API Guidelines
Similar to Google's guide, Microsoft provides comprehensive guidelines for designing RESTful APIs, covering naming conventions, error handling, versioning, and security. These guidelines offer valuable insights into building enterprise-grade APIs.
More resources on API Development
Google Cloud API Design Guide
This guide provides opinionated, experience-backed best practices and principles for designing robust, usable, and consistent APIs, drawing from Google's extensive experience in building and managing large-scale APIs. It's an excellent resource for industry-standard API design patterns.
REST Architectural Constraints (Martin Fowler)
Martin Fowler, a highly respected figure in software development, provides a clear and concise explanation of the architectural constraints that define REST, making it an excellent resource for understanding RESTful API design principles from a practical, expert perspective.
Architectural Styles and the Design of Network-based Software Architectures (Roy Fielding's Dissertation)
This is the foundational academic paper by Roy Fielding that introduced and defined REST (Representational State Transfer), the architectural style underpinning the vast majority of web APIs. It is essential for understanding the core principles of RESTful API design directly from its creator.