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## Latest Changes
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### Highlights
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Now you can declare `Query`, `Header`, and `Cookie` parameters with Pydantic models. 🎉
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#### `Query` Parameter Models
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Use Pydantic models for `Query` parameters:
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```python
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from typing import Annotated, Literal
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from fastapi import FastAPI, Query
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from pydantic import BaseModel, Field
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app = FastAPI()
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class FilterParams(BaseModel):
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limit: int = Field(100, gt=0, le=100)
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offset: int = Field(0, ge=0)
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order_by: Literal["created_at", "updated_at"] = "created_at"
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tags: list[str] = []
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@app.get("/items/")
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async def read_items(filter_query: Annotated[FilterParams, Query()]):
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return filter_query
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```
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Read the new docs: [Query Parameter Models](https://fastapi.tiangolo.com/tutorial/query-param-models/).
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#### `Header` Parameter Models
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Use Pydantic models for `Header` parameters:
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```python
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from typing import Annotated
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from fastapi import FastAPI, Header
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from pydantic import BaseModel
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app = FastAPI()
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class CommonHeaders(BaseModel):
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host: str
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save_data: bool
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if_modified_since: str | None = None
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traceparent: str | None = None
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x_tag: list[str] = []
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@app.get("/items/")
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async def read_items(headers: Annotated[CommonHeaders, Header()]):
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return headers
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```
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Read the new docs: [Header Parameter Models](https://fastapi.tiangolo.com/tutorial/header-param-models/).
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#### `Cookie` Parameter Models
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Use Pydantic models for `Cookie` parameters:
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```python
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from typing import Annotated
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from fastapi import Cookie, FastAPI
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from pydantic import BaseModel
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app = FastAPI()
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class Cookies(BaseModel):
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session_id: str
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fatebook_tracker: str | None = None
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googall_tracker: str | None = None
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@app.get("/items/")
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async def read_items(cookies: Annotated[Cookies, Cookie()]):
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return cookies
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```
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Read the new docs: [Cookie Parameter Models](https://fastapi.tiangolo.com/tutorial/cookie-param-models/).
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#### Forbid Extra Query (Cookie, Header) Parameters
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Use Pydantic models to restrict extra values for `Query` parameters (also applies to `Header` and `Cookie` parameters).
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To achieve it, use Pydantic's `model_config = {"extra": "forbid"}`:
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```python
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from typing import Annotated, Literal
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from fastapi import FastAPI, Query
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from pydantic import BaseModel, Field
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app = FastAPI()
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class FilterParams(BaseModel):
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model_config = {"extra": "forbid"}
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limit: int = Field(100, gt=0, le=100)
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offset: int = Field(0, ge=0)
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order_by: Literal["created_at", "updated_at"] = "created_at"
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tags: list[str] = []
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@app.get("/items/")
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async def read_items(filter_query: Annotated[FilterParams, Query()]):
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return filter_query
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```
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This applies to `Query`, `Header`, and `Cookie` parameters, read the new docs:
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* [Forbid Extra Query Parameters](https://fastapi.tiangolo.com/tutorial/query-param-models/#forbid-extra-query-parameters)
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* [Forbid Extra Headers](https://fastapi.tiangolo.com/tutorial/header-param-models/#forbid-extra-headers)
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* [Forbid Extra Cookies](https://fastapi.tiangolo.com/tutorial/cookie-param-models/#forbid-extra-cookies)
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### Features
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* ✨ Add support for Pydantic models for parameters using `Query`, `Cookie`, `Header`. PR [#12199](https://github.com/fastapi/fastapi/pull/12199) by [@tiangolo](https://github.com/tiangolo).
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