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React · Theory

Google Login in React

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Theory

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Google Login in React

Google sign-in: frontend gets an id token from Google’s button/SDK, POSTs it to your API, API verifies with Google and starts a session/JWT. Never put the Google client secret in React. Don’t treat a decoded JWT in the browser as proof — verify server-side.

Google Login in React — output — three steps. Frontend never holds the Google client secret.

Exam tip

OAuth token verified on the backend.

Example

// Google login
console.log("1. Google button → id token");
console.log("2. POST token to your API");
console.log("3. API verifies with Google, sets session");

Google Login in React — output: three steps. Frontend never holds the Google client secret.

Short notes

  • DefToken → your API.
  • RuleVerify on server.
  • RememberNo secrets in the frontend.

Questions

1

Explain Google Login as if you are teaching a junior — definition, then one tiny UI.

2

What does the example show on screen (or print), and what does that prove?

3

What mistake do freshers make with Google Login?

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