[Solved] What is wrong with this FastAPI OAuth2 password flow code snippet? from fastapi import FastAPI, Depends from fastapi.... What is wrong with this FastAPI OAuth2 password flow code snippet? | FastAPI

FastAPI - Authentication and Security

What is wrong with this FastAPI OAuth2 password flow code snippet?

from fastapi import FastAPI, Depends
from fastapi.security import OAuth2PasswordRequestForm

app = FastAPI()

@app.post('/token')
async def login(form_data: OAuth2PasswordRequestForm):
    if form_data.username == 'bob' and form_data.password == 'pass':
        return {'access_token': 'abc', 'token_type': 'bearer'}
    return {'error': 'Invalid'}

AEndpoint should use GET method instead of POST

BIncorrect import of OAuth2PasswordRequestForm

CReturn type should be a string, not dict

DMissing Depends() in function parameter for form_data

Step-by-Step Solution

Solution:

Step 1: Check function parameter for dependency injection
OAuth2PasswordRequestForm must be wrapped with Depends() to extract form data properly.
Step 2: Verify other parts
Imports are correct, return type as dict is valid JSON response, POST method is correct for token requests.
Final Answer:
Missing Depends() in function parameter for form_data -> Option D
Quick Check:
Use Depends() to get form data [OK]

Quick Trick: Always wrap OAuth2PasswordRequestForm with Depends() [OK]

Common Mistakes:

MISTAKES

Forgetting Depends() causes runtime errors
Using GET instead of POST for token endpoint
Thinking return must be string, not dict

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What is wrong with this FastAPI OAuth2 password flow code snippet?

Step 1: Check function parameter for dependency injection

Step 2: Verify other parts

Final Answer:

Quick Check:

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