> ## Documentation Index
> Fetch the complete documentation index at: https://docs.r28.ai/charter/llms.txt
> Use this file to discover all available pages before exploring further.

# crawl_params_preview

> Preview crawl parameters generated from a natural language prompt.

<div className="tool-route"><span className="tool-row-method" data-method="POST">POST</span><code>{"https://api.firecrawl.dev/v2/crawl/params-preview"}</code></div>

```python firecrawl_crawl_params_preview.py theme={null}
from charter.packs import firecrawl

result = await firecrawl.crawl_params_preview.ainvoke({"url": ..., "prompt": ...})
```

## Body

<div className="reference-table">
  | Field                                                          | Type     | Description                                                                                                           |
  | -------------------------------------------------------------- | -------- | --------------------------------------------------------------------------------------------------------------------- |
  | `url` <span className="required" title="required">\*</span>    | `string` | The URL to crawl                                                                                                      |
  | `prompt` <span className="required" title="required">\*</span> | `string` | Natural language prompt describing what you want to crawl <span className="field-constraints">max length 10000</span> |
</div>