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✨ Allow specifying max_field, max_files and max_part_size for routers and path operations #14447

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✨ Allow specifying max_field, max_files and max_part_size for routers and path operations #14447

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@YuriiMotov
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@YuriiMotov YuriiMotov commented Dec 3, 2025 •
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FastAPI currently allows configuring upload limits only at the application level (using middleware), which makes it difficult to apply different constraints to different endpoints.
In some cases you may want to specify different values for specific router or endpoint. Currently there is no such option.

The idea of this PR is to allow specifying such limits for routers and endpoints.

As an experiment, I implemented this for post method. If it's Ok then will implement for app, router and other methods

upload_file_router = APIRouter(form_max_files=100, max_part_size=1024*1024)


@upload_file_router.post(
    "/upload-multi", max_part_size=1024*1024*100,
    form_max_files=1000,
)
async def upload(files: List[UploadFile] = File(...)):
    pass


app = FastAPI(form_max_files=0, max_part_size=1024)

app.include_router(upload_file_router)

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@YuriiMotov YuriiMotov added the feature New feature or request label Dec 3, 2025
maxachis
maxachis reviewed Dec 3, 2025
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tests/test_form_max_fields_files_part_size.py Outdated Show resolved Hide resolved
@YuriiMotov YuriiMotov force-pushed the allow-specifying-max-values-for-form branch from 6963426 to 45b472b Compare December 3, 2025 21:59
@YuriiMotov YuriiMotov changed the title ✨ Allow specifying max_field, max_files and max_part_size for path operations ✨ Allow specifying max_field, max_files and max_part_size for routers and path operations Dec 4, 2025
@dolfinus
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dolfinus commented Dec 6, 2025 •
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Instead of modifying app.post() method, maybe it should be a part of annotation?

@app.post("/data")
async def handle_fiels(
  files: Annotated[List[UploadFile], Field(max_items=10), File(max_size="10MiB")]
): ...

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@YuriiMotov @dolfinus @maxachis
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