OAuth 2.0 is an open standard authorization framework used to grant third-party applications limited access to protected resources without exposing user credentials. It enables secure authorization in client-server interactions, commonly used in web and mobile applications to allow users to grant selective access to their data hosted on other services.
The protocol operates by issuing access tokens to clients after user consent, which are then used to authenticate requests to protected endpoints. It supports various grant types, including authorization code, implicit, client credentials, and refresh token flows, allowing flexibility across different application types such as single-page apps, mobile apps, and server-to-server communication.
Developers and security engineers use OAuth 2.0 to implement secure, scalable authentication systems, often in combination with OpenID Connect for identity verification. It is widely adopted by cloud platforms, social media APIs, and enterprise identity providers.
- Enables secure delegated access to APIs and web resources
- Commonly used in web, mobile, and cloud-based applications
- Supports multiple grant types for different client types
- Integrates with identity providers like Google, Microsoft, and Okta
- Requires understanding of access tokens, scopes, and token expiration
Professionals with expertise in OAuth 2.0 are expected to design and implement secure authorization flows, manage token lifecycles, and protect against common vulnerabilities such as token leakage or misuse. This skill is essential for backend developers, API security specialists, and identity and access management (IAM) roles in technology, finance, healthcare, and SaaS industries.
