> ## 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.

# Langchain

> Firecrawl integrates with Langchain as a document loader.

> Note: this integration is still using [v0 version of the Firecrawl API](/v0/introduction). You can install the 0.0.20 version for the Python SDK or the 0.0.36 for the Node SDK.

## Installation

```bash theme={null}
pip install firecrawl-py==0.0.20
```

## Usage

You will need to get your own API key. See [https://firecrawl.dev](https://firecrawl.dev)

```python theme={null}
from langchain_community.document_loaders import FireCrawlLoader

loader = FireCrawlLoader(
    api_key="YOUR_API_KEY", url="https://firecrawl.dev", mode="crawl"
)

docs = loader.load()
```

### Modes

Scrape: Scrape single url and return the markdown.
Crawl: Crawl the url and all accessible sub pages and return the markdown for each one.

```python theme={null}
loader = FireCrawlLoader(
    api_key="YOUR_API_KEY",
    url="https://firecrawl.dev",
    mode="scrape",
)

data = loader.load()
```

### Crawler Options

You can also pass params to the loader. This is a dictionary of options to pass to the crawler. See the FireCrawl API documentation for more information.

## Langchain JS

To use it in Langchain JS, you can install it via npm:

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

Then, you can use it like this:

```typescript theme={null}
import { FireCrawlLoader } from "langchain/document_loaders/web/firecrawl";

const loader = new FireCrawlLoader({
  url: "https://firecrawl.dev", // The URL to scrape
  apiKey: process.env.FIRECRAWL_API_KEY, // Optional, defaults to `FIRECRAWL_API_KEY` in your env.
  mode: "scrape", // The mode to run the crawler in. Can be "scrape" for single urls or "crawl" for all accessible subpages
  params: {
    // optional parameters based on Firecrawl API docs
    // For API documentation, visit https://docs.firecrawl.dev
  },
});

const docs = await loader.load();
```