multipart-rs
A drop-in replacement for python-multipart with a Rust-powered core via PyO3.
Swap python-multipart for multipart-rs with zero code changes in Starlette / FastAPI applications.
Supports Python 3.10 – 3.14 on Linux, macOS, and Windows.
Performance
Benchmarked on Apple M4 Pro, Python 3.13 (median of 10 runs):
| Benchmark | python-multipart | multipart-rs | Speedup |
|---|---|---|---|
| Small form (~2 KB) | 50.6 µs | 4.3 µs | 11.7x |
| 100 small files (~100 KB) | 3.14 ms | 172.3 µs | 18.2x |
| Mixed fields+files (~5 MB) | 833.9 µs | 185.5 µs | 4.5x |
| Single large file (50 MB) | 6.54 ms | 1.58 ms | 4.1x |
| Querystring small (~500 B) | 25.0 µs | 5.4 µs | 4.7x |
| Querystring large (~1 MB) | 1.42 ms | 365.5 µs | 3.9x |
Geometric mean: 5.1x faster
Installation
pip install multipart-rs
Usage
multipart-rs exposes the exact same API as python-multipart v0.0.26. Replace the import and everything works:
# Before
from python_multipart.multipart import MultipartParser, QuerystringParser
# After
from multipart_rs import MultipartParser, QuerystringParser
With Starlette / FastAPI
# settings.py or conftest.py — patch before Starlette imports the parser
import multipart_rs
import sys
sys.modules["multipart"] = multipart_rs
sys.modules["multipart.multipart"] = multipart_rs
Low-level parser
from multipart_rs import MultipartParser
def on_part_data(data, start, end):
print(f"Got {end - start} bytes of part data")
parser = MultipartParser(
boundary=b"----formdata",
callbacks={
"on_part_begin": lambda: print("part begin"),
"on_part_data": on_part_data,
"on_part_end": lambda: print("part end"),
"on_end": lambda: print("done"),
},
)
parser.write(raw_body)
parser.finalize()
High-level form parsing
from multipart_rs import parse_form
fields = []
files = []
parse_form(
headers={"Content-Type": b"multipart/form-data; boundary=----formdata"},
input_stream=stream,
on_field=lambda field: fields.append(field),
on_file=lambda file: files.append(file),
)
API
All of the following are importable from multipart_rs:
| Export | Description |
|---|---|
MultipartParser |
Streaming multipart/form-data parser |
QuerystringParser |
Streaming querystring parser |
OctetStreamParser |
Streaming octet-stream parser |
FormParser |
High-level parser (auto-selects based on Content-Type) |
Field |
Parsed form field |
File |
Parsed file upload |
parse_options_header |
RFC 2231 header parser |
create_form_parser |
Create a FormParser from headers |
parse_form |
One-shot form parsing |
Base64Decoder |
Base64 content-transfer-encoding decoder |
QuotedPrintableDecoder |
Quoted-printable decoder |
Exceptions
FormParserError(ValueError)
├── ParseError(FormParserError)
│ ├── MultipartParseError
│ ├── QuerystringParseError
│ └── DecodeError
└── FileError(FormParserError, OSError)
Development
# Setup
uv venv .venv && source .venv/bin/activate
uv pip install maturin
# Build and install in dev mode
maturin develop --release
# Run tests
pytest tests/ -v
# Run benchmarks (requires python-multipart for comparison)
uv pip install python-multipart
python benchmarks/bench.py # side-by-side comparison
python benchmarks/bench.py rust # multipart-rs only
Architecture
The performance-critical parsing logic runs in Rust. The Python layer handles orchestration, file I/O, and API compatibility.
src/ # Rust core (PyO3)
├── multipart.rs # Multipart parser state machine
├── querystring.rs # Querystring parser state machine
├── octet_stream.rs # Octet-stream parser
└── parse_options_header.rs # RFC 2231 header parsing
python/multipart_rs/ # Python compatibility layer
├── __init__.py # Public API re-exports
├── _compat.py # Field, File, FormParser
├── decoders.py # Base64/QuotedPrintable decoders
└── exceptions.py # Exception hierarchy
The Rust parser processes the entire buffer in a single call and returns a list of events (event_type, start, end). The Python wrapper dispatches callbacks using the original buffer with zero-copy slicing.
License
Apache-2.0
1 maintainer
Metadata
1 maintainer
Release files for multipart-rs 0.0.1
For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.
Source distribution (sdist)
| File | Size | Uploaded | |
|---|---|---|---|
| multipart_rs-0.0.1.tar.gz | 60.2 kB | Details |
Built distributions (wheels)
Total release size: 10.1 MB
Release files / multipart_rs-0.0.1.tar.gz
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