# .NET (/es/quickstarts/dotnet)
Related: [Node.js](/es/quickstarts/nodejs.md), [Next.js](/es/quickstarts/nextjs.md), [Express](/es/quickstarts/express.md), [NestJS](/es/quickstarts/nestjs.md), [Fastify](/es/quickstarts/fastify.md), [Hono](/es/quickstarts/hono.md)
## Requisitos previos [#requisitos-previos]
* .NET 6.0+
* Una clave de API de Firecrawl: [obtén una gratis](https://www.firecrawl.dev/app/api-keys)
## Buscar en la web [#buscar-en-la-web]
Firecrawl se puede usar con .NET a través de la API REST mediante `HttpClient`.
```csharp
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);
```
```json
{
"success": true,
"data": {
"web": [
{
"url": "https://docs.firecrawl.dev",
"title": "Firecrawl Documentation",
"markdown": "# Firecrawl\n\nFirecrawl is a web scraping API..."
}
]
}
}
```
## Hacer scraping de una página [#hacer-scraping-de-una-página]
```csharp
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);
```
```json
{
"success": true,
"data": {
"markdown": "# Example Domain\n\nThis domain is for use in illustrative examples...",
"metadata": {
"title": "Example Domain",
"sourceURL": "https://example.com"
}
}
}
```
## Interact con una página [#interact-con-una-página]
Inicia una sesión de navegador, interact con la página utilizando prompts en lenguaje natural y luego cierra la sesión.
### Paso 1 — Haz scraping para iniciar una sesión [#paso-1--haz-scraping-para-iniciar-una-sesión]
```csharp
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}");
```
### Paso 2 — Enviar interacciones [#paso-2--enviar-interacciones]
```csharp
var interactUrl = $"https://api.firecrawl.dev/v2/scrape/{scrapeId}/interact";
// Buscar un producto
var searchBody = new StringContent(
JsonSerializer.Serialize(new { prompt = "Search for iPhone 16 Pro Max" }),
Encoding.UTF8,
"application/json"
);
var searchResult = await client.PostAsync(interactUrl, searchBody);
Console.WriteLine(await searchResult.Content.ReadAsStringAsync());
// Hacer clic en el primer resultado
var clickBody = new StringContent(
JsonSerializer.Serialize(new { prompt = "Click on the first result and tell me the price" }),
Encoding.UTF8,
"application/json"
);
var clickResult = await client.PostAsync(interactUrl, clickBody);
Console.WriteLine(await clickResult.Content.ReadAsStringAsync());
```
### Paso 3 — Detener la sesión [#paso-3--detener-la-sesión]
```csharp
await client.DeleteAsync(interactUrl);
Console.WriteLine("Sesión detenida");
```
## Clase de cliente reutilizable [#clase-de-cliente-reutilizable]
Si vas a usarla repetidamente, encapsula la API en un cliente tipado:
```csharp
using System.Net.Http.Headers;
using System.Text;
using System.Text.Json;
public class FirecrawlClient
{
private readonly HttpClient _http;
private const string BaseUrl = "https://api.firecrawl.dev/v2";
public FirecrawlClient(string apiKey)
{
_http = new HttpClient();
_http.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", apiKey);
}
private async Task PostAsync(string endpoint, object payload)
{
var content = new StringContent(
JsonSerializer.Serialize(payload),
Encoding.UTF8,
"application/json"
);
var response = await _http.PostAsync($"{BaseUrl}{endpoint}", content);
response.EnsureSuccessStatusCode();
var json = await response.Content.ReadAsStringAsync();
return JsonDocument.Parse(json);
}
public async Task ScrapeAsync(string url)
{
return await PostAsync("/scrape", new { url });
}
public async Task 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);
```
## Próximos pasos [#próximos-pasos]
Busca en la web y obtén el contenido completo de la página
Todas las opciones de scraping, incluidos formatos, acciones y proxies
Haz clic, completa formularios y extrae contenido dinámico
Documentación completa de la API REST