> ## 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.

# .NET

> Get started with Firecrawl in .NET. Scrape, search, and interact with web data using the REST API.

## Prerequisites

* .NET 6.0+
* A Firecrawl API key — [get one free](https://www.firecrawl.dev/app/api-keys)

## Search the web

Firecrawl works with .NET through the REST API using `HttpClient`.

```csharp theme={null}
using System.Net.Http.Headers;
using System.Text;
using System.Text.Json;

var apiKey = Environment.GetEnvironmentVariable("FIRECRAWL_API_KEY");
var client = new HttpClient();
client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", apiKey);

var content = new StringContent(
    JsonSerializer.Serialize(new { query = "firecrawl web scraping", limit = 5 }),
    Encoding.UTF8,
    "application/json"
);

var response = await client.PostAsync("https://api.firecrawl.dev/v2/search", content);
var json = await response.Content.ReadAsStringAsync();
Console.WriteLine(json);
```

<Accordion title="Example response">
  ```json theme={null}
  {
    "success": true,
    "data": {
      "web": [
        {
          "url": "https://docs.firecrawl.dev",
          "title": "Firecrawl Documentation",
          "markdown": "# Firecrawl\n\nFirecrawl is a web scraping API..."
        }
      ]
    }
  }
  ```
</Accordion>

## Scrape a page

```csharp theme={null}
var scrapeContent = new StringContent(
    JsonSerializer.Serialize(new { url = "https://example.com" }),
    Encoding.UTF8,
    "application/json"
);

var scrapeResponse = await client.PostAsync("https://api.firecrawl.dev/v2/scrape", scrapeContent);
var scrapeJson = await scrapeResponse.Content.ReadAsStringAsync();

using var doc = JsonDocument.Parse(scrapeJson);
var markdown = doc.RootElement.GetProperty("data").GetProperty("markdown").GetString();
Console.WriteLine(markdown);
```

<Accordion title="Example response">
  ```json theme={null}
  {
    "success": true,
    "data": {
      "markdown": "# Example Domain\n\nThis domain is for use in illustrative examples...",
      "metadata": {
        "title": "Example Domain",
        "sourceURL": "https://example.com"
      }
    }
  }
  ```
</Accordion>

## Interact with a page

Start a browser session, interact with the page using natural-language prompts, then close the session.

### Step 1 — Scrape to start a session

```csharp theme={null}
var sessionContent = new StringContent(
    JsonSerializer.Serialize(new { url = "https://www.amazon.com", formats = new[] { "markdown" } }),
    Encoding.UTF8,
    "application/json"
);

var sessionResponse = await client.PostAsync("https://api.firecrawl.dev/v2/scrape", sessionContent);
var sessionJson = await sessionResponse.Content.ReadAsStringAsync();

using var sessionDoc = JsonDocument.Parse(sessionJson);
var scrapeId = sessionDoc.RootElement
    .GetProperty("data")
    .GetProperty("metadata")
    .GetProperty("scrapeId")
    .GetString();

Console.WriteLine($"scrapeId: {scrapeId}");
```

### Step 2 — Send interactions

```csharp theme={null}
var interactUrl = $"https://api.firecrawl.dev/v2/scrape/{scrapeId}/interact";

// Search for a product
var searchBody = new StringContent(
    JsonSerializer.Serialize(new { prompt = "Search for iPhone 16 Pro Max" }),
    Encoding.UTF8,
    "application/json"
);

var searchResult = await client.PostAsync(interactUrl, searchBody);
Console.WriteLine(await searchResult.Content.ReadAsStringAsync());

// Click on the first result
var clickBody = new StringContent(
    JsonSerializer.Serialize(new { prompt = "Click on the first result and tell me the price" }),
    Encoding.UTF8,
    "application/json"
);

var clickResult = await client.PostAsync(interactUrl, clickBody);
Console.WriteLine(await clickResult.Content.ReadAsStringAsync());
```

### Step 3 — Stop the session

```csharp theme={null}
await client.DeleteAsync(interactUrl);
Console.WriteLine("Session stopped");
```

## Reusable client class

For repeated use, wrap the API in a typed client:

```csharp theme={null}
using System.Net.Http.Headers;
using System.Text;
using System.Text.Json;

public class FirecrawlClient
{
    private readonly HttpClient _http;
    private const string BaseUrl = "https://api.firecrawl.dev/v2";

    public FirecrawlClient(string apiKey)
    {
        _http = new HttpClient();
        _http.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", apiKey);
    }

    private async Task<JsonDocument> PostAsync(string endpoint, object payload)
    {
        var content = new StringContent(
            JsonSerializer.Serialize(payload),
            Encoding.UTF8,
            "application/json"
        );

        var response = await _http.PostAsync($"{BaseUrl}{endpoint}", content);
        response.EnsureSuccessStatusCode();

        var json = await response.Content.ReadAsStringAsync();
        return JsonDocument.Parse(json);
    }

    public async Task<JsonDocument> ScrapeAsync(string url)
    {
        return await PostAsync("/scrape", new { url });
    }

    public async Task<JsonDocument> SearchAsync(string query, int limit = 5)
    {
        return await PostAsync("/search", new { query, limit });
    }
}

// Usage
var firecrawl = new FirecrawlClient(Environment.GetEnvironmentVariable("FIRECRAWL_API_KEY")!);
var result = await firecrawl.SearchAsync("firecrawl web scraping");
Console.WriteLine(result.RootElement);
```

## Next steps

<CardGroup cols={2}>
  <Card title="Search docs" icon="magnifying-glass" href="/features/search">
    Search the web and get full page content
  </Card>

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

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

  <Card title="API Reference" icon="code" href="/api-reference/v2-introduction">
    Complete REST API documentation
  </Card>
</CardGroup>