But it's signed. So, when you receive a token that you emitted, you can verify that you actually emitted it.

That way, you can create a token with an expiration of, let's say, 1 week. And then when the user comes back the next day with the token, you know that user is still logged in to your system.

!!! info

For a more "real life" example of this, imagine a bank.

Up to recently, most of the banks had multiple cashiers 👨‍💼👨‍💼👨‍💼👨‍💼 and a big line 🕙🕙🕙🕙🕙🕙🕙🕙.

All of the cashiers doing all the work with one client after the other 👨‍💼⏯.

And you have to wait 🕙 in the line for a long time or you lose your turn.

You probably wouldn't want to take your crush 😍 with you to do errands at the bank 🏦.

### Burger Conclusion

Whenever you pass exactly the same content (exactly the same password) you get exactly the same gibberish.

But you cannot convert from the gibberish back to the password.

##### Why use password hashing

If your database is stolen, the thief won't have your users' plaintext passwords, only the hashes.

    * `UUID` objects.
    * Database models.
    * ...and many more.
* Automatic interactive API documentation, including 2 alternative user interfaces:
    * Swagger UI.
    * ReDoc.

---

Coming back to the previous code example, **FastAPI** will:

* Validate that there is an `item_id` in the path for `GET` and `PUT` requests.
* Validate that the `item_id` is of type `int` for `GET` and `PUT` requests.

Bütün **FastAPI** frameworkü oto-tamamlama açısından geliştiriciyi tatmin etmek üzerine tasarlandı. Otomatik tamamlama her yerde çalışıyor.

Dokümantasyona tekrardan çok nadir olarak geleceksin.

Editörün sana nasıl yardım ettiğine bir bak:

* <a href="https://code.visualstudio.com/" class="external-link" target="_blank">Visual Studio Code</a> ile:

![editor support](https://fastapi.tiangolo.com/img/vscode-completion.png)

    * `UUID` objects.
    * Database models.
    * ...and many more.
* Automatic interactive API documentation, including 2 alternative user interfaces:
    * Swagger UI.
    * ReDoc.

---

Coming back to the previous code example, **FastAPI** will:

* Validate that there is an `item_id` in the path for `GET` and `PUT` requests.
* Validate that the `item_id` is of type `int` for `GET` and `PUT` requests.

!!! warning
    This example is not secure, the password is not hashed.

    In a real life application you would need to hash the password and never save them in plaintext.

    For more details, go back to the Security section in the tutorial.

    Here we are focusing only on the tools and mechanics of databases.

!!! tip

Dennoch ist das schlussendliche Benutzererlebnis nicht das Beste. 😞

---

Dies wäre die parallele äquivalente Geschichte für Hamburger. 🍔

Für ein „realeres“ Beispiel hierfür, stellen Sie sich eine Bank vor.

Bis vor kurzem hatten die meisten Banken mehrere Kassierer 👨‍💼👨‍💼👨‍💼👨‍💼 und eine große Warteschlange 🕙🕙🕙🕙🕙🕙🕙🕙.

Alle Kassierer erledigen die ganze Arbeit mit einem Kunden nach dem anderen 👨‍💼⏯.