Why is OAuth still hard in 2025?

OAuth, despite being a standard protocol with widespread availability of client libraries across programming languages, presents significant challenges due to its complex and varied real-world implementations. While OAuth 2.0 is the default, numerous APIs interpret the standard differently, leading to a plethora of unique implementations and nonstandard behaviors that complicate integration efforts. Developers often face issues like inconsistent parameter requirements, varied token request formats, and cumbersome approval processes, with many APIs implementing only parts of the OAuth standard they deem necessary. Additionally, security considerations and evolving best practices add layers of complexity, requiring developers to navigate potential race conditions, token expiration issues, and storage security. The text highlights Nango, an open-source service designed to simplify OAuth integrations with prebuilt flows and secure token management, as a potential solution to these challenges.

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