> 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 Consulta los pasos para empezar rápidamente con Oxylabs 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 analizadores mediante API Presets de parser Escribir instrucciones manualmente Lista de funciones de análisis *** ## Inicio rápido ### 1. Genera un analizador Te recomendamos empezar con nuestra herramienta impulsada por IA [**OxyCopilot**](/products/es/web-scraper-api/web-scraper-api-playground/oxycopilot.md) que te permite generar scrapers y analizadores sin escribir código. {% hint style="success" %} Para acceder a OxyCopilot, inicia sesión en el [**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 analizador**: {% embed url="" %} Estos son los mismos pasos que se muestran en el video: 1. **Introduce la(s) URL(s)** que quieres extraer y analizar 2. **Especifica cualquier parámetro** como la renderización de JavaScript 3. **Escribe un prompt** que describa lo que quieres analizar 4. **Ejecutar** OxyCopilot Cuando estés satisfecho con el analizador generado, carga las instrucciones. ### 2. Guarda el analizador como un preset Puedes guardar fácilmente tus analizadores generados mediante 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. {% hint style="info" %} Un preset recién creado puede tardar hasta aproximadamente un minuto en estar disponible para trabajos de scraping tanto en Realtime como en Push-Pull. Hasta entonces, las solicitudes que lo referencian se rechazan con `400 - El parser_preset proporcionado no existe.` {% endhint %} ### 3. Usa el analizador 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 ) # Print prettified response to 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": [ { "_request": {...}, "_response": {...}, "content": { "parse_status_code": 12000, "title": "Example Domain" }, "created_at": "2026-09-08 08:26:26", "is_render_forced": false, "job_id": "7503005818992731137", "page": 1, "parser_preset": "example_parser", "parser_type": "preset", "session_info": {...}, "status_code": 200, "type": "parsed", "updated_at": "2026-09-08 08:26:26", "url": "https://example.com/" } ] } ```
## Obtener el contenido HTML de un trabajo analizado Un trabajo analizado también puede devolver el HTML sin procesar del que fue analizado: añade el `tipo` parámetro de consulta con `raw` (o `parsed,raw` para ambos) al endpoint Realtime o a la URL de resultados Push-Pull. Consulta [**Salida en múltiples formatos**](/products/es/web-scraper-api/features/result-processing-and-storage/output-types/multi-format-output.md). --- # 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.