How to validate request body in fastapi?

@raphael_tillman 

In FastAPI, you can validate request body by using Pydantic models. Here's an example of how to do it:

1. Create a Pydantic model representing the request body. For example:

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from pydantic import BaseModel

class Item(BaseModel):
    name: str
    price: float

1. Use the Pydantic model as a type hint in your FastAPI route function. For example:

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from fastapi import FastAPI
from pydantic import BaseModel

app = FastAPI()

class Item(BaseModel):
    name: str
    price: float

@app.post("/items/")
def create_item(item: Item):
    return {"name": item.name, "price": item.price}

1. When a request is made to the /items/ endpoint, FastAPI will automatically validate the request body against the Item model. If the request body does not match the model schema, FastAPI will return a 422 Unprocessable Entity response with details about the validation errors.

By using Pydantic models in this way, you can easily validate request bodies in FastAPI routes.