Se você não declarar um modelo de resposta, o FastAPI usará o `jsonable_encoder` explicado em [Codificador Compatível com JSON](../tutorial/encoder.md) e o colocará em uma `JSONResponse`.

Você também pode criar uma `JSONResponse` diretamente e retorná-la.

/// tip | Dica

* the cloud provider
* the cloud service

* the development
* the development stages

* the dict
* the dictionary
* the enumeration
* the enum
* the enum member

* the encoder
* the decoder
* to encode
* to decode

* the exception
* to raise

* the expression
* the statement

* the frontend
* the backend

* the GitHub discussion
* the GitHub issue

from datetime import datetime

from fastapi import FastAPI
from fastapi.encoders import jsonable_encoder
from fastapi.responses import JSONResponse
from pydantic import BaseModel


class Item(BaseModel):
    title: str
    timestamp: datetime
    description: str | None = None


app = FastAPI()


@app.put("/items/{id}")
def update_item(id: str, item: Item):
    json_compatible_item_data = jsonable_encoder(item)

	{
		var zb0001 uint8
		zb0001, err = dc.ReadUint8()
		if err != nil {
			err = msgp.WrapError(err)
			return
		}
		(*z) = Flags(zb0001)
	}
	return
}

// EncodeMsg implements msgp.Encodable
func (z Flags) EncodeMsg(en *msgp.Writer) (err error) {
	err = en.WriteUint8(uint8(z))
	if err != nil {
		err = msgp.WrapError(err)
		return
	}
	return
}

// MarshalMsg implements msgp.Marshaler

				return
			}
		}
	}
	return
}

// EncodeMsg implements msgp.Encodable
func (z *BatchJobReplicateFlags) EncodeMsg(en *msgp.Writer) (err error) {
	// map header, size 3
	// write "Filter"
	err = en.Append(0x83, 0xa6, 0x46, 0x69, 0x6c, 0x74, 0x65, 0x72)
	if err != nil {
		return
	}
	err = z.Filter.EncodeMsg(en)
	if err != nil {
		err = msgp.WrapError(err, "Filter")
		return
	}

	{
		var zb0001 uint8
		zb0001, err = dc.ReadUint8()
		if err != nil {
			err = msgp.WrapError(err)
			return
		}
		(*z) = rebalSaveOpts(zb0001)
	}
	return
}

// EncodeMsg implements msgp.Encodable
func (z rebalSaveOpts) EncodeMsg(en *msgp.Writer) (err error) {
	err = en.WriteUint8(uint8(z))
	if err != nil {
		err = msgp.WrapError(err)
		return
	}
	return
}

// MarshalMsg implements msgp.Marshaler

from fastapi import FastAPI, Request
from fastapi.encoders import jsonable_encoder
from fastapi.exceptions import RequestValidationError
from fastapi.responses import JSONResponse
from pydantic import BaseModel

app = FastAPI()


@app.exception_handler(RequestValidationError)
async def validation_exception_handler(request: Request, exc: RequestValidationError):
    return JSONResponse(
        status_code=422,

    }

    @Test
    @DisplayName("Test encode and decode operations")
    void testEncodeDecodeOperations() {
        byte[] buffer = new byte[1024];

        // Initialize transaction buffer to avoid NPE
        transaction.setBuffer(new byte[SmbComTransaction.TRANSACTION_BUF_SIZE]);

        // Test encode
        int encodeLength = transaction.encode(buffer, 0);
        assertTrue(encodeLength > 0);

		switch msgp.UnsafeString(field) {
		case "Nodes":
			var zb0002 uint32
			zb0002, err = dc.ReadArrayHeader()
			if err != nil {
				err = msgp.WrapError(err, "Nodes")
				return
			}
			if cap(z.Nodes) >= int(zb0002) {
				z.Nodes = (z.Nodes)[:zb0002]
			} else {
				z.Nodes = make([]ReplQNodeStats, zb0002)
			}
			for za0001 := range z.Nodes {
				err = z.Nodes[za0001].DecodeMsg(dc)
				if err != nil {

Si vous ne déclarez pas de modèle de réponse, FastAPI utilisera le `jsonable_encoder` expliqué dans [Encodeur compatible JSON](../tutorial/encoder.md) et le placera dans une `JSONResponse`.