---
title: JustAPI
description: Python web framework powered by Rust. 766k req/s hello-world. FastAPI-compatible API, zero-config OpenAPI.
template: splash
---

<div class="ja-hero">
  <span is="badge" variant="green"> v2.0.9 · published on PyPI · 8 platforms</span>
  <h1>
    Python writes the logic.<br/>
    <span class="accent">Rust does everything else.</span>
  </h1>
  <p class="ja-hero-sub">
    JustAPI is a Python web framework with a Rust core. One import, zero config —
    routing, TLS, validation, serialization and the server itself run in Rust.
  </p>
  <div class="ja-hero-actions">
    <a href="/getting-started/overview/" is="button" size="large"> Get Started</a>
    <a href="https://github.com/swadhinbiswas/JustAPI" is="button" box="" size="large"> GitHub</a>
  </div>
</div>

## Performance

<div class="ja-stats">
  <div class="ja-stat">
    <div class="ja-stat-value">766k</div>
    <div class="ja-stat-label">req/s hello-world</div>
  </div>
  <div class="ja-stat">
    <div class="ja-stat-value">782k</div>
    <div class="ja-stat-label">req/s JSON echo</div>
  </div>
  <div class="ja-stat">
    <div class="ja-stat-value">2.4x</div>
    <div class="ja-stat-label">faster than Granian</div>
  </div>
  <div class="ja-stat">
    <div class="ja-stat-value">53x</div>
    <div class="ja-stat-label">native async DB</div>
  </div>
  <div class="ja-stat">
    <div class="ja-stat-value">181k</div>
    <div class="ja-stat-label">native CRUD SELECT</div>
  </div>
  <div class="ja-stat">
    <div class="ja-stat-value">12MB</div>
    <div class="ja-stat-label">resident memory</div>
  </div>
</div>

## Quick start

<div class="ja-tabs">
  <div class="ja-tabs-bar">
    <button class="ja-tab-btn" data-tab-btn="pip" data-active="true"> pip</button>
    <button class="ja-tab-btn" data-tab-btn="uv"> uv</button>
    <button class="ja-tab-btn" data-tab-btn="scaffold"> scaffold</button>
  </div>
  <div class="ja-tab-panel" data-tab-panel="pip">
```bash
pip install justapi
python main.py
# ✓ JustAPI running on http://127.0.0.1:8000
```
  </div>
  <div class="ja-tab-panel" data-tab-panel="uv" style="display:none">
```bash
uv pip install justapi
uv run main.py
```
  </div>
  <div class="ja-tab-panel" data-tab-panel="scaffold" style="display:none">
```bash
uvx justapi create my_app
cd my_app && python app/main.py
```
  </div>
</div>

## Minimal app

<div class="ja-terminal">
  <div class="ja-terminal-bar">
    <span class="ja-terminal-dot"></span>
    <span class="ja-terminal-dot"></span>
    <span class="ja-terminal-dot"></span>
    <span class="ja-terminal-title"> main.py</span>
  </div>
  <div class="ja-terminal-body">
    <span class="cm">from</span> justapi <span class="cm">import</span> JustAPIApp<br/>
    <br/>
    app = JustAPIApp()<br/>
    <br/>
    <span class="cm">@app.get</span>(<span class="ok">"/"</span>)<br/>
    <span class="cm">def</span> hello():<br/>
    &nbsp;&nbsp;&nbsp;&nbsp;<span class="cm">return</span> &#123;<span class="ok">"Hello"</span>: <span class="ok">"World"</span>&#125;<br/>
    <br/>
    app.run()<br/>
    <span class="ok"></span> <span class="dim">server started · /docs · /redoc · OpenAPI auto</span>
  </div>
</div>

## Benchmarks

<div class="ja-bars">
  <div class="ja-bar-row ja-bar-row--winner">
    <span class="ja-bar-label">JustAPI</span>
    <div class="ja-bar-track"><div class="ja-bar-fill" data-w="100%"></div></div>
    <span class="ja-bar-value">766k</span>
  </div>
  <div class="ja-bar-row">
    <span class="ja-bar-label">Granian</span>
    <div class="ja-bar-track"><div class="ja-bar-fill" data-w="41%"></div></div>
    <span class="ja-bar-value">314k</span>
  </div>
  <div class="ja-bar-row">
    <span class="ja-bar-label">Robyn</span>
    <div class="ja-bar-track"><div class="ja-bar-fill" data-w="5%"></div></div>
    <span class="ja-bar-value">39k</span>
  </div>
  <div class="ja-bar-row">
    <span class="ja-bar-label">FastAPI</span>
    <div class="ja-bar-track"><div class="ja-bar-fill" data-w="5%"></div></div>
    <span class="ja-bar-value">36k</span>
  </div>
</div>

<blockquote>
  hello-world, 100 concurrent connections, 30s, same hardware — full methodology in <a href="https://github.com/swadhinbiswas/JustAPI/blob/main/BENCHMARKS.md">BENCHMARKS.md</a>
</blockquote>

## Features

<div class="ja-grid">
  <div class="ja-card">
    <div class="ja-card-icon"></div>
    <h3>Rust core</h3>
    <p>Networking, TLS, routing, serialization run in Rust. Python executes only your logic.</p>
  </div>
  <div class="ja-card">
    <div class="ja-card-icon"></div>
    <h3>Native async DB</h3>
    <p><code>await app.db.query_async()</code> runs SQL on Rust's tokio runtime — 53× faster on slow queries.</p>
  </div>
  <div class="ja-card">
    <div class="ja-card-icon"></div>
    <h3>Rust-native SSE</h3>
    <p><code>app.sse_native()</code> streams events with zero Python per event.</p>
  </div>
  <div class="ja-card">
    <div class="ja-card-icon"></div>
    <h3>Multi-worker</h3>
    <p><code>justapi serve --workers N</code> — 1.88× throughput at 4 workers, auto-scale.</p>
  </div>
  <div class="ja-card">
    <div class="ja-card-icon"></div>
    <h3>Free-threaded</h3>
    <p>CPython 3.14t wheels — CPU-bound Python scales with cores, 12.4× measured.</p>
  </div>
  <div class="ja-card">
    <div class="ja-card-icon"></div>
    <h3>Security built-in</h3>
    <p>JWT, rate limiting, CORS, security headers — all in Rust middleware.</p>
  </div>
  <div class="ja-card">
    <div class="ja-card-icon"></div>
    <h3>Production-ready</h3>
    <p>Circuit breakers, OTel tracing, Prometheus metrics, health checks.</p>
  </div>
  <div class="ja-card">
    <div class="ja-card-icon"></div>
    <h3>Type-checked</h3>
    <p><code>py.typed</code> + complete stubs — mypy-clean on user code.</p>
  </div>
  <div class="ja-card">
    <div class="ja-card-icon"></div>
    <h3>FastAPI-compatible</h3>
    <p>Same decorators, Pydantic models, Depends. Migrate with one import.</p>
  </div>
</div>

## Framework comparison

| | FastAPI | JustAPI |
|---|---|---|
| **Server** | uvicorn (Python) | Rust (tokio + hyper) |
| **Hello-world** | ~36k req/s | **~766k req/s** |
| **JSON echo** | ~33k req/s | **~782k req/s** |
| **Native DB SELECT** | Python driver | **181k req/s (×125)** |
| **Memory** | 29 MB | **12 MB** |

<div class="ja-cta">
  <h2>Ready to build something fast?</h2>
  <p>One import. Rust underneath. Zero config.</p>
  <a href="/getting-started/overview/" is="button" size="large"> Get Started</a>
</div>