Do I have to use Bcrypt?

While `passlib` supports many algorithms (argon2, pbkdf2), Bcrypt is the standard, battle-tested recommendation for web application passwords. It is intentionally slow to prevent brute-force attacks.

Can I use an email instead of a username?

Yes. The OAuth2 spec requires the form field to be named `username`, but the actual data inside it can be an email address. You just query your database like this: `where(User.email == form_data.username)`.

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OAuth2 Login & Password Hashing

Implement a fully compliant OAuth2 login endpoint. Learn how to extract form data securely, verify hashed passwords using passlib, and return standardized access tokens that automatically integrate with Swagger UI.

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