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OAuth

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May 1, 2024 Updated May 12, 2025 15 minute read

An Introduction to OAuth: Secure Delegated Access

OAuth, short for Open Authorization, is a fundamental technology underpinning much of the modern web. It's an open standard designed to allow applications to access resources hosted by other web services on behalf of a user, without requiring the user to share their sensitive login credentials. If you've ever clicked "Sign in with Google" or allowed an application to access your contacts or photos stored elsewhere, you've likely encountered OAuth working behind the scenes. Understanding OAuth is increasingly important not just for developers building applications, but also for anyone interested in web security, API design, or simply how different parts of the internet securely communicate.

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We've selected three books that we think will supplement your learning. Use these to develop background knowledge, enrich your coursework, and gain a deeper understanding of the topics covered in OAuth.
Technical guide to the OAuth 2.0 protocol, providing a deep dive into its inner workings.
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