JustAPI is an ultra-fast Python web framework built on a Rust core. One import, zero config — routing, TLS, request validation, serialization, and connection handling run in Rust.
pip install justapi python main.py # ✓ JustAPI running on http://127.0.0.1:8000
hello-world, 100 concurrent connections, 30s benchmark duration on identical hardware — see detailed methodology in BENCHMARKS.md
Sockets, TLS termination, HTTP parsing (hyper), routing, and response writing run entirely in Rust.
await app.db.query_async() runs SQL queries on Rust's tokio pool — up to 53× faster on slow queries.
app.sse_native() streams real-time events with zero Python overhead per emitted message.
justapi serve --workers N provides 1.88× throughput scaling across multi-core systems.
Native support for GIL-free CPython — CPU-bound Python routes scale linearly across all CPU cores.
JWT verification, token bucket rate limiting, CORS headers, and OWASP security middleware run in Rust.
Circuit breakers, OpenTelemetry distributed tracing, Prometheus metrics, and automated health checks.
Ships with py.typed marker and complete type stubs for 100% clean mypy type validation.
Uses familiar decorators, Pydantic models, and Depends injection. Migrate with one import change.
| Metric / Feature | FastAPI | JustAPI |
|---|---|---|
| Runtime Core | uvicorn (Python) | Rust (tokio + hyper) |
| Hello World Throughput | ~36k req/s | ~766k req/s (21x faster) |
| JSON Echo Throughput | ~33k req/s | ~782k req/s (23x faster) |
| Native DB SELECT | Python DB Driver | 181k req/s (125x faster) |
| Memory Footprint | ~29 MB | ~12 MB (58% lower) |
One import. Powered by Rust. Zero complex configuration.
Read the Documentation