Free BBAN to IBAN Converter & National Account Calculator

const response = await fetch("https://global-iban-bic-swift-bank-routing-validator-api.stanzaapi.com/api/v1/iban/validate", {
  method: "POST",
  headers: {
    "Content-Type": "application/json",
    "x-api-key": process.env.API_KEY || "YOUR_API_KEY"
  },
  body: JSON.stringify({
  "iban": "DE89370400440532013000"
})
});

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

import requests
import json

url = "https://global-iban-bic-swift-bank-routing-validator-api.stanzaapi.com/api/v1/iban/validate"
headers = {
    "Content-Type": "application/json",
    "x-api-key": "YOUR_API_KEY"
}
payload = {
    "iban": "DE89370400440532013000"
}

response = requests.post(url, json=payload, headers=headers)
print(response.json())

package main

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

func main() {
	url := "https://global-iban-bic-swift-bank-routing-validator-api.stanzaapi.com/api/v1/iban/validate"
	payload := []byte(`{"iban":"DE89370400440532013000"}`)

	req, _ := http.NewRequest("POST", url, bytes.NewBuffer(payload))
	req.Header.Add("Content-Type", "application/json")
	req.Header.Add("x-api-key", os.Getenv("API_KEY"))

	res, err := http.DefaultClient.Do(req)
	if err != nil {
		panic(err)
	}
	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)
	fmt.Println(string(body))
}

using System;
using System.Net.Http;
using System.Text;
using System.Threading.Tasks;

class Program
{
    static async Task Main()
    {
        using var client = new HttpClient();
        client.DefaultRequestHeaders.Add("x-api-key", Environment.GetEnvironmentVariable("API_KEY") ?? "YOUR_API_KEY");

        var json = @"{""iban"":""DE89370400440532013000""}";
        var payload = new StringContent(json, Encoding.UTF8, "application/json");

        var response = await client.PostAsync("https://global-iban-bic-swift-bank-routing-validator-api.stanzaapi.com/api/v1/iban/validate", payload);
        var content = await response.Content.ReadAsStringAsync();
        Console.WriteLine(content);
    }
}