My code:
@app.post('/create')
async def createUser(request: UserRequest, db: Session = Depends(get_db)):
      print(request)
      _user = crud.createUser(db, user_schema=request.parameter)    
      return _user
Schema:
class UserSchema(BaseModel):
# id: Optional[int] = None
      username: Optional[str] = None
      password: Optional[str] = None
      email: Optional[str] = None
      class Config:
            orm_mode = True
    
    
class UserRequest(BaseModel):
       parameter: UserSchema = Field(...)
The error:
"loc": "body"
"msg": "value is not a valid dict",
"type": "type_error.dict"
 
    