Why Authorization code flow in Rest API? - Purpose & Use Cases

The Big Idea

What if you could share access without ever handing over your password?

The Scenario

Imagine you want to let a friend borrow your house key, but you don't want to give them full access to everything. You try to write down all the rules and permissions on paper and hand it over manually.

The Problem

This manual method is slow and risky. Your friend might lose the paper, misunderstand the rules, or even misuse the key. You have no easy way to check or revoke access quickly.

The Solution

The Authorization code flow acts like a secure messenger between you and your friend. It safely hands over a temporary code that your friend exchanges for a key with limited access, all without exposing your main password or secrets.

Before vs After

✗ Before

User sends username and password directly to app; app stores password.

✓ After

User gets a temporary code; app exchanges code for access token securely.

What It Enables

This flow enables secure, controlled access to user data without exposing sensitive credentials, making apps safer and user trust stronger.

Real Life Example

When you log into a new app using your Google account, the Authorization code flow lets Google confirm your identity and share only the needed info with the app, without sharing your password.

Key Takeaways

Manual sharing of access is risky and hard to manage.

Authorization code flow securely exchanges temporary codes for access.

This protects user credentials and controls app permissions safely.