SMRTR ProgrammingJan 4, 2026Dev.to

The Magic Behind “Login with Google”: How OAuth 2.0 Actually Works

SMRTR summary

OAuth authentication powers those convenient "Login with Google" buttons by creating a secure multi-step dance between your browser, the website, and identity providers like Google. The process involves client registration, secure redirects with authorization codes, server-to-server token exchanges, and multiple security measures like PKCE and state validation to prevent attacks while keeping your credentials safe.

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