VKN Validator

Data Validation Credits / request: 1

Validates a Turkish tax identification number (10 digits) by checksum. Not a registry lookup.

GET https://api.apikodu.com/api/v1/vknvalidator

Documentation

Overview

10-digit VKN checksum. Invalid codes return HTTP 200 with isValid=false. Not a registry lookup.

Authentication

Every request requires the x-api-key header. Credits used and remaining quota are returned in response headers (x-api-credits-used, x-api-remaining-credits, x-rate-limit-*).

Request

GET https://api.apikodu.com/api/v1/vknvalidator?code=1234567890

Query string.

Parameters

Name	Type	Required	Default	Options	Description
`code`	string	* Required	—	—	10-digit VKN.

Response

Name	Type	Description
`isValid`	boolean	true when checksum is valid.
`checkDigit`	integer	10th digit. Null when invalid.
`maskedCode`	string	VKN with the middle masked.

Errors

HTTP	code	Description
`400`	`-188`	code is empty.
`401`	`-100`	x-api-key is missing, empty, malformed, inactive, banned, expired, IP-restricted, or not allowed for this API.
`429`	`-221`	Per-minute request limit exceeded. Response headers: x-rate-limit-limit, x-rate-limit-remaining, x-rate-limit-reset.
`429`	—	Package credit quota cannot cover this request. Body may be { error, limit, currentUsage, requestCost } (no code field).
`500`	`-1`	Unexpected server error. message is a generic error text without technical details.

Notes

Success body is { data: { ... } }. Error body is { code, message }. code is an ApiResponseCode enum value (negative integer).

Sample response

{
  "data": {
    "isValid": true,
    "checkDigit": 0,
    "maskedCode": "12******90"
  }
}

Code samples

  
      const response = await fetch('https://api.apikodu.com/api/v1/vknvalidator', {
        method: 'GET',
        headers: {
          'x-api-key': 'YOUR_API_KEY'
        }
      });

      const data = await response.json();
      console.log(data);

  
      import requests

      headers = {
          'x-api-key': 'YOUR_API_KEY'
      }

      response = requests.get('https://api.apikodu.com/api/v1/vknvalidator', headers=headers)
      print(response.json())

  
      using var client = new HttpClient();
      client.DefaultRequestHeaders.Add("x-api-key", "YOUR_API_KEY");

      var response = await client.GetStringAsync("https://api.apikodu.com/api/v1/vknvalidator");
      Console.WriteLine(response);

  
      $response = file_get_contents('https://api.apikodu.com/api/v1/vknvalidator', false, stream_context_create([
          'http' => [
              'header' => "x-api-key: YOUR_API_KEY"
          ]
      ]));

      print_r(json_decode($response, true));

  
      curl -X GET 'https://api.apikodu.com/api/v1/vknvalidator' \
        -H 'x-api-key: YOUR_API_KEY'

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