Duplicate content checker API API

Example request

curl -H "X-API-Key: $DOMSCAN_API_KEY" "https://domscan.net/v1/duplicate-content?urls=https%3A%2F%2Fexample.com"

const response = await fetch("https://domscan.net/v1/duplicate-content?urls=https%3A%2F%2Fexample.com", {
  headers: { "X-API-Key": process.env.DOMSCAN_API_KEY },
});
const data = await response.json();
console.log(data);

import os
import requests

response = requests.get(
    "https://domscan.net/v1/duplicate-content?urls=https%3A%2F%2Fexample.com",
    headers={"X-API-Key": os.environ["DOMSCAN_API_KEY"]},
)
print(response.json())

package main

import (
	"fmt"
	"io"
	"net/http"
	"os"
)

func main() {
	req, err := http.NewRequest(http.MethodGet, "https://domscan.net/v1/duplicate-content?urls=https%3A%2F%2Fexample.com", nil)
	if err != nil {
		panic(err)
	}
	req.Header.Set("X-API-Key", os.Getenv("DOMSCAN_API_KEY"))

	resp, err := http.DefaultClient.Do(req)
	if err != nil {
		panic(err)
	}
	defer resp.Body.Close()

	data, err := io.ReadAll(resp.Body)
	if err != nil {
		panic(err)
	}
	fmt.Println(resp.Status, string(data))
}

require "json"
require "net/http"

uri = URI("https://domscan.net/v1/duplicate-content?urls=https%3A%2F%2Fexample.com")
request = Net::HTTP::Get.new(uri)
request["X-API-Key"] = ENV.fetch("DOMSCAN_API_KEY")

response = Net::HTTP.start(uri.hostname, uri.port, use_ssl: true) do |http|
  http.request(request)
end
puts JSON.pretty_generate(JSON.parse(response.body))

Example response

{
  "status": "ok",
  "checked_at": "2026-10-13T12:00:00.000Z",
  "threshold": 0.8,
  "pages": [
    {
      "url": "https://example.com/a",
      "final_url": "https://example.com/a",
      "status": "ok",
      "reason": null,
      "http_status": 200,
      "title": "Trail shoes",
      "meta_description": "Shop trail shoes",
      "h1": "Trail shoes",
      "canonical": null,
      "word_count": 640,
      "comparable": true,
      "comparison_reason": null
    },
    {
      "url": "https://example.com/b",
      "final_url": "https://example.com/b",
      "status": "ok",
      "reason": null,
      "http_status": 200,
      "title": "Trail shoes",
      "meta_description": "Shop trail shoes",
      "h1": "Trail running shoes",
      "canonical": null,
      "word_count": 655,
      "comparable": true,
      "comparison_reason": null
    }
  ],
  "pairs": [
    {
      "a": "https://example.com/a",
      "b": "https://example.com/b",
      "similarity": 0.91,
      "containment": 0.96,
      "near_duplicate": true,
      "comparable": true,
      "canonicalized": false,
      "same_final_url": false,
      "reason": null
    }
  ],
  "clusters": [
    [
      "https://example.com/a",
      "https://example.com/b"
    ]
  ],
  "duplicates": {
    "titles": [
      {
        "value": "trail shoes",
        "urls": [
          "https://example.com/a",
          "https://example.com/b"
        ]
      }
    ],
    "meta_descriptions": [
      {
        "value": "shop trail shoes",
        "urls": [
          "https://example.com/a",
          "https://example.com/b"
        ]
      }
    ],
    "h1": []
  },
  "summary": {
    "pages": 2,
    "readable": 2,
    "unknown": 0,
    "comparable_pairs": 1,
    "unknown_pairs": 0,
    "same_final_url_pairs": 0,
    "near_duplicate_pairs": 1,
    "uncanonicalized_near_duplicates": 1
  }
}

HTTP status codes

• 200 OK
• 400 Bad Request
• 401 Unauthorized
• 402 Payment Required
• 429 Too Many Requests