> ## Documentation Index
> Fetch the complete documentation index at: https://docs.firecrawl.dev/llms.txt
> Use this file to discover all available pages before exploring further.

# Fastify

> Use Firecrawl with Fastify to build high-performance web scraping and search APIs.

## Prerequisites

* Node.js 18+
* A Firecrawl API key — [get one free](https://www.firecrawl.dev/app/api-keys)

## Setup

```bash theme={null}
npm install fastify @mendable/firecrawl-js
```

Add your API key to `.env`:

```bash theme={null}
FIRECRAWL_API_KEY=fc-YOUR-API-KEY
```

## Search the web

```javascript theme={null}
import Fastify from "fastify";
import Firecrawl from "@mendable/firecrawl-js";

const fastify = Fastify({ logger: true });
const firecrawl = new Firecrawl({ apiKey: process.env.FIRECRAWL_API_KEY });

fastify.post("/search", async (request) => {
  const { query } = request.body;
  return firecrawl.search(query, { limit: 5 });
});

fastify.listen({ port: 3000 });
```

## Scrape a page

```javascript theme={null}
fastify.post("/scrape", async (request) => {
  const { url } = request.body;
  return firecrawl.scrape(url);
});
```

## Interact with a page

Use interact to control a live browser session — click buttons, fill forms, and extract dynamic content.

```javascript theme={null}
fastify.post("/interact", async (request) => {
  const { url } = request.body;

  const result = await firecrawl.scrape(url, { formats: ['markdown'] });
  const scrapeId = result.metadata?.scrapeId;

  await firecrawl.interact(scrapeId, { prompt: 'Search for iPhone 16 Pro Max' });
  const response = await firecrawl.interact(scrapeId, { prompt: 'Click on the first result and tell me the price' });

  await firecrawl.stopInteraction(scrapeId);

  return { output: response.output };
});
```

## As a Fastify plugin

Encapsulate the client in a plugin for reuse across routes:

```javascript theme={null}
import fp from "fastify-plugin";
import Firecrawl from "@mendable/firecrawl-js";

export default fp(async function firecrawlPlugin(fastify) {
  const client = new Firecrawl({ apiKey: process.env.FIRECRAWL_API_KEY });
  fastify.decorate("firecrawl", client);
});
```

Register the plugin, then use `fastify.firecrawl` in any route:

```javascript theme={null}
fastify.register(firecrawlPlugin);

fastify.post("/search", async function (request) {
  const { query } = request.body;
  return this.firecrawl.search(query, { limit: 5 });
});
```

## Test it

```bash theme={null}
curl -X POST http://localhost:3000/search \
  -H "Content-Type: application/json" \
  -d '{"query": "firecrawl web scraping"}'
```

## Next steps

<CardGroup cols={2}>
  <Card title="Scrape docs" icon="file-lines" href="/features/scrape">
    All scrape options including formats, actions, and proxies
  </Card>

  <Card title="Search docs" icon="magnifying-glass" href="/features/search">
    Search the web and get full page content
  </Card>

  <Card title="Interact docs" icon="hand-pointer" href="/features/interact">
    Click, fill forms, and extract dynamic content
  </Card>

  <Card title="Node SDK reference" icon="node" href="/sdks/node">
    Full SDK reference with crawl, map, batch scrape, and more
  </Card>
</CardGroup>