> For the complete documentation index, see [llms.txt](https://developers.oxylabs.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developers.oxylabs.io/products/es/web-scraper-api/features/custom-parser.md). # Custom Parser Custom Parser es una función gratuita de Web Scraper API que te permite **crear lógica de análisis y procesamiento de datos** que se ejecuta sobre un resultado HTML sin procesar. Puedes generar analizadores automáticamente usando IA o escribirlos manualmente para escenarios avanzados. Para instrucciones y ejemplos detallados, consulta estas páginas: Primeros pasos Generación de parsers mediante API Presets de parser Escribir instrucciones manualmente Lista de funciones de análisis *** ## Inicio rápido ### 1. Genera un parser Te recomendamos comenzar con nuestra herramienta con IA [**OxyCopilot**](/products/es/web-scraper-api/web-scraper-api-playground/oxycopilot.md) que te permite generar scrapers y parsers sin escribir código. {% hint style="success" %} Para acceder a OxyCopilot, inicia sesión en [**panel de Oxylabs**](https://dashboard.oxylabs.io/en/) y selecciona **Scraper APIs Playground** en el menú de la izquierda. {% endhint %} Sigue los pasos que se muestran en el video para **generar un parser**: {% embed url="" %} Aquí están los mismos pasos que se muestran en el video: 1. **Introduce la(s) URL(s)** que quieres rastrear y analizar 2. **Especifica cualquier parámetro** como el renderizado de JavaScript 3. **Escribe una instrucción** que describa lo que quieres analizar 4. **Ejecutar** OxyCopilot Cuando estés satisfecho con el parser generado, carga las instrucciones. ### 2. Guarda el parser como un preset Puedes guardar fácilmente tus parsers generados a través de OxyCopilot para usarlos más tarde. Consulta los pasos a continuación: {% embed url="" %} 1. **Asigna el preset** a un usuario específico de la API 2. Haz clic en **Guardar** 3. **Introduce el nombre del preset** y la descripción (opcional) Después de guardar el preset, puedes usarlo con solicitudes de API. ### 3. Usa el parser con solicitudes de API Para usar tu preset con Web Scraper API, envía un payload con el `parser_preset` parámetro establecido en el nombre de tu preset. En los ejemplos de código siguientes, estamos reutilizando el `example_parser` preset creado en los pasos anteriores. {% tabs %} {% tab title="cURL" %} ```shell curl 'https://realtime.oxylabs.io/v1/queries' \\ --user 'USERNAME:PASSWORD' \\ -H 'Content-Type: application/json' \\ -d '{ "source": "universal", "url": "https://example.com/", "parse": true, "parser_preset": "example_parser" }' ``` {% endtab %} {% tab title="Python" %} ```python import requests from pprint import pprint # Set the parser preset to use. payload = { 'source': 'universal', 'url': 'https://example.com/', 'parse': True, 'parser_preset': 'example_parser' } # Get a response. response = requests.request( 'POST', 'https://realtime.oxylabs.io/v1/queries', auth=('USERNAME', 'PASSWORD'), json=payload ) # Imprime la respuesta formateada en stdout. pprint(response.json()) ``` {% endtab %} {% tab title="Node.js" %} ```javascript const https = require("https"); const username = "USERNAME"; const password = "PASSWORD"; const body = { source: "universal", url: "https://example.com/", parse: true, parser_preset: "example_parser" }; const options = { hostname: "realtime.oxylabs.io", path: "/v1/queries", method: "POST", headers: { "Content-Type": "application/json", Authorization: "Basic " + Buffer.from(`${username}:${password}`).toString("base64"), }, }; const request = https.request(options, (response) => { let data = ""; response.on("data", (chunk) => { data += chunk; }); response.on("end", () => { const responseData = JSON.parse(data); console.log(JSON.stringify(responseData, null, 2)); }); }); request.on("error", (error) => { console.error("Error:", error); }); request.write(JSON.stringify(body)); request.end(); ``` {% endtab %} {% tab title="HTTP" %} ```http # The whole string you submit has to be URL-encoded. https://realtime.oxylabs.io/v1/queries?source=universal&url=https%3A%2F%2Fexample.com%2F&parse=true&parser_preset=example_parser&access_token=12345abcde ``` {% endtab %} {% tab title="PHP" %} ```php 'universal', 'url' => 'https://example.com/', 'parse' => true, 'parser_preset' => 'example_parser' ); $ch = curl_init(); curl_setopt($ch, CURLOPT_URL, "https://realtime.oxylabs.io/v1/queries"); curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($params)); curl_setopt($ch, CURLOPT_POST, 1); curl_setopt($ch, CURLOPT_USERPWD, "USERNAME" . ":" . "PASSWORD"); $headers = array(); $headers[] = "Content-Type: application/json"; curl_setopt($ch, CURLOPT_HTTPHEADER, $headers); $result = curl_exec($ch); echo $result; if (curl_errno($ch)) { echo 'Error:' . curl_error($ch); } curl_close($ch); ``` {% endtab %} {% tab title="Golang" %} ```go package main import ( "bytes" "encoding/json" "fmt" "io/ioutil" "net/http" ) func main() { const Username = "USERNAME" const Password = "PASSWORD" payload := map[string]interface{}{ "source": "universal", "url": "https://example.com/", "parse": true, "parser_preset": "example_parser", } jsonValue, _ := json.Marshal(payload) client := &http.Client{} request, _ := http.NewRequest("POST", "https://realtime.oxylabs.io/v1/queries", bytes.NewBuffer(jsonValue), ) request.SetBasicAuth(Username, Password) response, _ := client.Do(request) responseText, _ := ioutil.ReadAll(response.Body) fmt.Println(string(responseText)) } ``` {% endtab %} {% tab title="C#" %} ```csharp using System; using System.Collections.Generic; using System.Net.Http; using System.Net.Http.Json; using System.Threading.Tasks; namespace OxyApi { class Program { static async Task Main() { const string Username = "USERNAME"; const string Password = "PASSWORD"; var parameters = new { source = "universal", url = "https://example.com/", parse = true, parser_preset = "example_parser" }; var client = new HttpClient(); Uri baseUri = new Uri("https://realtime.oxylabs.io"); client.BaseAddress = baseUri; var requestMessage = new HttpRequestMessage(HttpMethod.Post, "/v1/queries"); requestMessage.Content = JsonContent.Create(parameters); var authenticationString = $"{Username}:{Password}"; var base64EncodedAuthenticationString = Convert.ToBase64String(System.Text.ASCIIEncoding.UTF8.GetBytes(authenticationString)); requestMessage.Headers.Add("Authorization", "Basic " + base64EncodedAuthenticationString); var response = await client.SendAsync(requestMessage); var contents = await response.Content.ReadAsStringAsync(); Console.WriteLine(contents); } } } ``` {% endtab %} {% tab title="Java" %} ```java package org.example; import okhttp3.*; import org.json.JSONObject; import java.util.concurrent.TimeUnit; public class Main implements Runnable { private static final String AUTHORIZATION_HEADER = "Authorization"; public static final String USERNAME = "USERNAME"; public static final String PASSWORD = "PASSWORD"; public void run() { JSONObject jsonObject = new JSONObject(); jsonObject.put("source", "universal"); jsonObject.put("url", "https://example.com/"); jsonObject.put("parse", true); jsonObject.put("parser_preset", "example_parser"); Authenticator authenticator = (route, response) -> { String credential = Credentials.basic(USERNAME, PASSWORD); return response .request() .newBuilder() .header(AUTHORIZATION_HEADER, credential) .build(); }; var client = new OkHttpClient.Builder() .authenticator(authenticator) .readTimeout(180, TimeUnit.SECONDS) .build(); var mediaType = MediaType.parse("application/json; charset=utf-8"); var body = RequestBody.create(jsonObject.toString(), mediaType); var request = new Request.Builder() .url("https://realtime.oxylabs.io/v1/queries") .post(body) .build(); try (var response = client.newCall(request).execute()) { if (response.body() != null) { try (var responseBody = response.body()) { System.out.println(responseBody.string()); } } } catch (Exception exception) { System.out.println("Error: " + exception.getMessage()); } System.exit(0); } public static void main(String[] args) { new Thread(new Main()).start(); } } ``` {% endtab %} {% tab title="JSON" %} ```json { "source": "universal", "url": "https://example.com/", "parse": true, "parser_preset": "example_parser" } ``` {% endtab %} {% endtabs %}
Ejemplo de salida ```json { "results": [ { "content": { "title": "Example Domain", "parse_status_code": 12000 }, "created_at": "2025-10-24 10:04:59", "updated_at": "2025-10-24 10:05:00", "page": 1, "url": "https://example.com/", "job_id": "7387428891226308609", "is_render_forced": false, "status_code": 200, "type": "parsed", "parser_type": "preset", "parser_preset": "example_parser" } ] } ```
## Obteniendo el contenido HTML de un trabajo analizado También puedes recuperar el resultado HTML sin procesar agregando `?type=raw` al final de la URL de recuperación del resultado. Leer más [**aquí**](/products/es/web-scraper-api/integration-methods/push-pull.md#endpoints). --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://developers.oxylabs.io/products/es/web-scraper-api/features/custom-parser.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.