What is OAuth?

OAuth, or Open Authorization, is an open standard for token-based authentication and authorization. It allows third-party applications secure delegated access to server resources on behalf of a user. OAuth works over HTTPS and authorizes devices, APIs, servers, and applications with access tokens rather than credentials.

How Does OAuth Work?

OAuth provides client applications a ‘secure delegated access’ to server resources on behalf of a user. It involves a series of redirections and exchanges of information, resulting in the client application obtaining an access token. This token represents the authorization given by the user and can be used by the client application to access the server resources permitted by the user.

Here are the steps involved in the OAuth process:

  • Client application requests authorization from the user
  • User authorizes the client application
  • Client application receives an authorization grant
  • Client application requests an access token from the authorization server by presenting its own credentials and the authorization grant
  • If the application’s credentials are valid and the authorization grant is valid, the authorization server issues an access token to the application

Why Use OAuth?

The primary advantage of OAuth is that it allows users to interact with secure resources without needing to share their credentials. Here are some reasons to use OAuth:

  • Security: OAuth’s token mechanism allows users to authorize third-party applications without sharing their credentials.
  • Standardization: OAuth is a widely adopted protocol. Using it means adopting a widely understood and accepted method of authorization.
  • Control: OAuth allows users to have granular control over what data third-party applications can access.

OAuth 2.0

OAuth 2.0 is the second iteration of the OAuth protocol and has become a standard for API authorization. This version introduces a number of new features and changes, including explicit and implicit authorization flows, better separation of roles, and improved security features.


Understanding OAuth is essential for developers, website administrators, and designers who want to provide secure, seamless, and user-friendly authorization processes. By providing a standard protocol for token-based authorization, OAuth ensures that user credentials are kept safe while giving third-party applications the access they need.

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