# FastAPI (/es/quickstarts/fastapi)

<!-- agent-signals: reading_time_min: 4 · est_tokens: 2066 · updated: 2026-07-30 -->
Related: [Node.js](/es/quickstarts/nodejs.md), [Next.js](/es/quickstarts/nextjs.md), [Express](/es/quickstarts/express.md), [NestJS](/es/quickstarts/nestjs.md), [Fastify](/es/quickstarts/fastify.md), [Hono](/es/quickstarts/hono.md)

<div id="prerequisites">
  ## Requisitos previos [#requisitos-previos]
</div>

* Python 3.8+
* Una clave de la API de Firecrawl — [consigue una gratis](https://www.firecrawl.dev/app/api-keys)

<div id="setup">
  ## Configuración [#configuración]
</div>

```bash
pip install fastapi uvicorn firecrawl-py
```

Añade tu clave de API a `.env`:

```bash
FIRECRAWL_API_KEY=fc-YOUR-API-KEY
```

<div id="create-the-api">
  ## Crea la API [#crea-la-api]
</div>

Crea `main.py`:

```python
import os
from fastapi import FastAPI
from pydantic import BaseModel
from firecrawl import Firecrawl

app = FastAPI()
firecrawl = Firecrawl(api_key=os.environ["FIRECRAWL_API_KEY"])


class SearchRequest(BaseModel):
    query: str
    limit: int = 5


class ScrapeRequest(BaseModel):
    url: str


class InteractRequest(BaseModel):
    scrape_id: str
    prompt: str


@app.post("/search")
async def search(req: SearchRequest):
    results = firecrawl.search(req.query, limit=req.limit)
    return [{"title": r.title, "url": r.url} for r in results.web]


@app.post("/scrape")
async def scrape(req: ScrapeRequest):
    result = firecrawl.scrape(req.url)
    return {"markdown": result.markdown, "metadata": result.metadata}


@app.post("/interact/start")
async def interact_start(req: ScrapeRequest):
    result = firecrawl.scrape(req.url, formats=["markdown"])
    return {"scrape_id": result.metadata.scrape_id}


@app.post("/interact")
async def interact(req: InteractRequest):
    response = firecrawl.interact(req.scrape_id, prompt=req.prompt)
    return {"output": response.output}


@app.post("/interact/stop")
async def interact_stop(req: InteractRequest):
    firecrawl.stop_interaction(req.scrape_id)
    return {"status": "stopped"}
```

<div id="run-it">
  ## Ejecútalo [#ejecútalo]
</div>

```bash
uvicorn main:app --reload
```

<div id="test-it">
  ## Pruébalo [#pruébalo]
</div>

```bash
# Buscar en la web
curl -X POST http://localhost:8000/search \
  -H "Content-Type: application/json" \
  -d '{"query": "firecrawl web scraping", "limit": 5}'

# Hacer scraping de una página
curl -X POST http://localhost:8000/scrape \
  -H "Content-Type: application/json" \
  -d '{"url": "https://example.com"}'

# Iniciar una sesión interactiva y luego enviar prompts
curl -X POST http://localhost:8000/interact/start \
  -H "Content-Type: application/json" \
  -d '{"url": "https://www.amazon.com"}'
```

FastAPI genera automáticamente documentación interactiva en `http://localhost:8000/docs`.

<div id="async-variant">
  ## Variante asíncrona [#variante-asíncrona]
</div>

Para mejorar la concurrencia con carga, usa `AsyncFirecrawl`:

```python
from firecrawl import AsyncFirecrawl

async_firecrawl = AsyncFirecrawl(api_key=os.environ["FIRECRAWL_API_KEY"])

@app.post("/scrape-async")
async def scrape_async(req: ScrapeRequest):
    result = await async_firecrawl.scrape(req.url)
    return {"markdown": result.markdown}
```

<div id="next-steps">
  ## Siguientes pasos [#siguientes-pasos]
</div>

<CardGroup cols="2">
  <Card title="Documentación de scraping" icon="<svg xmlns=&#x22;http://www.w3.org/2000/svg&#x22; viewBox=&#x22;0 0 24 24&#x22; fill=&#x22;none&#x22;><path d=&#x22;M8 7L16 7&#x22; stroke=&#x22;currentColor&#x22; stroke-linecap=&#x22;round&#x22; stroke-linejoin=&#x22;round&#x22; stroke-width=&#x22;1.5&#x22;/><path d=&#x22;M8 11L12 11&#x22; stroke=&#x22;currentColor&#x22; stroke-linecap=&#x22;round&#x22; stroke-linejoin=&#x22;round&#x22; stroke-width=&#x22;1.5&#x22;/><path d=&#x22;M13 21.5V21C13 18.1716 13 16.7574 13.8787 15.8787C14.7574 15 16.1716 15 19 15H19.5M20 13.3431V10C20 6.22876 20 4.34315 18.8284 3.17157C17.6569 2 15.7712 2 12 2C8.22877 2 6.34315 2 5.17157 3.17157C4 4.34314 4 6.22876 4 10L4 14.5442C4 17.7892 4 19.4117 4.88607 20.5107C5.06508 20.7327 5.26731 20.9349 5.48933 21.1139C6.58831 22 8.21082 22 11.4558 22C12.1614 22 12.5141 22 12.8372 21.886C12.9044 21.8623 12.9702 21.835 13.0345 21.8043C13.3436 21.6564 13.593 21.407 14.0919 20.9081L18.8284 16.1716C19.4065 15.5935 19.6955 15.3045 19.8478 14.9369C20 14.5694 20 14.1606 20 13.3431Z&#x22; stroke=&#x22;currentColor&#x22; stroke-linecap=&#x22;round&#x22; stroke-linejoin=&#x22;round&#x22; stroke-width=&#x22;1.5&#x22;/></svg>" href="/es/features/scrape">
    Todas las opciones de scraping, incluidos los formatos, las acciones y los proxies
  </Card>

  <Card title="Documentación de Search" icon="<svg xmlns=&#x22;http://www.w3.org/2000/svg&#x22; viewBox=&#x22;0 0 24 24&#x22; fill=&#x22;none&#x22;><path d=&#x22;M8 7L16 7&#x22; stroke=&#x22;currentColor&#x22; stroke-linecap=&#x22;round&#x22; stroke-linejoin=&#x22;round&#x22; stroke-width=&#x22;1.5&#x22;/><path d=&#x22;M8 11L12 11&#x22; stroke=&#x22;currentColor&#x22; stroke-linecap=&#x22;round&#x22; stroke-linejoin=&#x22;round&#x22; stroke-width=&#x22;1.5&#x22;/><path d=&#x22;M13 21.5V21C13 18.1716 13 16.7574 13.8787 15.8787C14.7574 15 16.1716 15 19 15H19.5M20 13.3431V10C20 6.22876 20 4.34315 18.8284 3.17157C17.6569 2 15.7712 2 12 2C8.22877 2 6.34315 2 5.17157 3.17157C4 4.34314 4 6.22876 4 10L4 14.5442C4 17.7892 4 19.4117 4.88607 20.5107C5.06508 20.7327 5.26731 20.9349 5.48933 21.1139C6.58831 22 8.21082 22 11.4558 22C12.1614 22 12.5141 22 12.8372 21.886C12.9044 21.8623 12.9702 21.835 13.0345 21.8043C13.3436 21.6564 13.593 21.407 14.0919 20.9081L18.8284 16.1716C19.4065 15.5935 19.6955 15.3045 19.8478 14.9369C20 14.5694 20 14.1606 20 13.3431Z&#x22; stroke=&#x22;currentColor&#x22; stroke-linecap=&#x22;round&#x22; stroke-linejoin=&#x22;round&#x22; stroke-width=&#x22;1.5&#x22;/></svg>" href="/es/features/search">
    Buscar en la web y obtener el contenido completo de la página
  </Card>

  <Card title="Documentación de Interact" icon="<svg xmlns=&#x22;http://www.w3.org/2000/svg&#x22; viewBox=&#x22;0 0 24 24&#x22; fill=&#x22;none&#x22;><path d=&#x22;M8 7L16 7&#x22; stroke=&#x22;currentColor&#x22; stroke-linecap=&#x22;round&#x22; stroke-linejoin=&#x22;round&#x22; stroke-width=&#x22;1.5&#x22;/><path d=&#x22;M8 11L12 11&#x22; stroke=&#x22;currentColor&#x22; stroke-linecap=&#x22;round&#x22; stroke-linejoin=&#x22;round&#x22; stroke-width=&#x22;1.5&#x22;/><path d=&#x22;M13 21.5V21C13 18.1716 13 16.7574 13.8787 15.8787C14.7574 15 16.1716 15 19 15H19.5M20 13.3431V10C20 6.22876 20 4.34315 18.8284 3.17157C17.6569 2 15.7712 2 12 2C8.22877 2 6.34315 2 5.17157 3.17157C4 4.34314 4 6.22876 4 10L4 14.5442C4 17.7892 4 19.4117 4.88607 20.5107C5.06508 20.7327 5.26731 20.9349 5.48933 21.1139C6.58831 22 8.21082 22 11.4558 22C12.1614 22 12.5141 22 12.8372 21.886C12.9044 21.8623 12.9702 21.835 13.0345 21.8043C13.3436 21.6564 13.593 21.407 14.0919 20.9081L18.8284 16.1716C19.4065 15.5935 19.6955 15.3045 19.8478 14.9369C20 14.5694 20 14.1606 20 13.3431Z&#x22; stroke=&#x22;currentColor&#x22; stroke-linecap=&#x22;round&#x22; stroke-linejoin=&#x22;round&#x22; stroke-width=&#x22;1.5&#x22;/></svg>" href="/es/features/interact">
    Haz clic, completa formularios y extrae contenido dinámico
  </Card>

  <Card title="Referencia del SDK de Python" icon="<svg xmlns=&#x22;http://www.w3.org/2000/svg&#x22; viewBox=&#x22;0 0 24 24&#x22; fill=&#x22;none&#x22;><path d=&#x22;M8 7L16 7&#x22; stroke=&#x22;currentColor&#x22; stroke-linecap=&#x22;round&#x22; stroke-linejoin=&#x22;round&#x22; stroke-width=&#x22;1.5&#x22;/><path d=&#x22;M8 11L12 11&#x22; stroke=&#x22;currentColor&#x22; stroke-linecap=&#x22;round&#x22; stroke-linejoin=&#x22;round&#x22; stroke-width=&#x22;1.5&#x22;/><path d=&#x22;M13 21.5V21C13 18.1716 13 16.7574 13.8787 15.8787C14.7574 15 16.1716 15 19 15H19.5M20 13.3431V10C20 6.22876 20 4.34315 18.8284 3.17157C17.6569 2 15.7712 2 12 2C8.22877 2 6.34315 2 5.17157 3.17157C4 4.34314 4 6.22876 4 10L4 14.5442C4 17.7892 4 19.4117 4.88607 20.5107C5.06508 20.7327 5.26731 20.9349 5.48933 21.1139C6.58831 22 8.21082 22 11.4558 22C12.1614 22 12.5141 22 12.8372 21.886C12.9044 21.8623 12.9702 21.835 13.0345 21.8043C13.3436 21.6564 13.593 21.407 14.0919 20.9081L18.8284 16.1716C19.4065 15.5935 19.6955 15.3045 19.8478 14.9369C20 14.5694 20 14.1606 20 13.3431Z&#x22; stroke=&#x22;currentColor&#x22; stroke-linecap=&#x22;round&#x22; stroke-linejoin=&#x22;round&#x22; stroke-width=&#x22;1.5&#x22;/></svg>" href="/es/sdks/python">
    Referencia completa del SDK con crawl, map, async y más
  </Card>
</CardGroup>
