OAuth 2.0

What is OAuth 2.0?

OAuth 2.0, stands for “Open Authorization version 2.0”, is a protocol that allows a user’s account information to be used by third-party services, such as Facebook, without exposing the user’s password. This is often used to let users log into third party websites using their Microsoft, Google, Facebook or Twitter accounts, without worrying about their access credentials being compromised.

Working of OAuth 2.0

OAuth 2.0 operates through a series of redirections and exchanges of authorization codes between the client, the authorization server and the resource server. This is followed by the issuance of an access token, which grants the client application the necessary authorization to access the resource server on behalf of the user.

Steps involved in the OAuth 2.0 flow:

  • Client Registration: The Application must be registered in the OAuth 2.0 server to get the client_id and client_secret.
  • Authorization Request: The client sends an authorization request to the authorization server.
  • Authorization Grant: If the user approves the authorization request, the authorization server sends an authorization grant to the client.
  • Access Token Request: The client sends an access token request to the authorization server with the authorization grant.
  • Access Token Response: If the access token request is valid, the authorization server issues an access token to the client.

Benefits of using OAuth 2.0

OAuth 2.0 provides several benefits for web developers and administrators. Some key benefits include:

  • Security: It provides a secure and robust method for authenticating users. The user’s credentials are never shared with the client application.
  • Scalability: It allows for large scale deployments, making it a suitable choice for enterprises.
  • Flexibility: With OAuth 2.0, it’s possible to grant varying levels of access to different applications. This makes it a versatile choice for managing permissions.


In conclusion, OAuth 2.0 is a powerful and flexible protocol that provides robust security for web applications. It’s a fundamental tool in the modern web developer’s toolkit and is used by many large tech companies to secure their applications and user data.

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