Saltar al contenido principal

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Requisitos previos

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Buscar en la web

Firecrawl se puede usar con .NET a través de la API REST mediante HttpClient. 
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);

{
  "success": true,
  "data": {
    "web": [
      {
        "url": "https://docs.firecrawl.dev",
        "title": "Firecrawl Documentation",
        "markdown": "# Firecrawl\n\nFirecrawl is a web scraping API..."
      }
    ]
  }
}

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Hacer scraping de una página

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);

{
  "success": true,
  "data": {
    "markdown": "# Example Domain\n\nThis domain is for use in illustrative examples...",
    "metadata": {
      "title": "Example Domain",
      "sourceURL": "https://example.com"
    }
  }
}

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Interact con una página

Inicia una sesión de navegador, interact con la página utilizando prompts en lenguaje natural y luego cierra la sesión.

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Paso 1 — Haz scraping para iniciar una sesión

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}");

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Paso 2 — Enviar interacciones

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

// Buscar un producto
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());

// Hacer clic en el primer resultado
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());

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Paso 3 — Detener la sesión

await client.DeleteAsync(interactUrl);
Console.WriteLine("Sesión detenida");

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Clase de cliente reutilizable

Si vas a usarla repetidamente, encapsula la API en un cliente tipado: 
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 });
    }
}

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

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Próximos pasos

Documentación de búsqueda

Busca en la web y obtén el contenido completo de la página

Documentación de scraping

Todas las opciones de scraping, incluidos formatos, acciones y proxies

Documentación de Interact

Haz clic, completa formularios y extrae contenido dinámico

Referencia de la API

Documentación completa de la API REST