How can I use an API to detect if an IP address is a VPN in D?

To detect if an IP address is a VPN using IP2Location.io in D, you can use the IP2Location.io API to retrieve geolocation and related data.

1. We'll assume that you have already installed D and we won't cover that here. You will also need a paid subscription to the Security plan. Subscribe now!
2. Save the below code into a file called test.d on your computer.
   D

   
   import std.stdio;
   import std.uri;
   import std.net.curl;
   import std.json;
   import std.conv;
   
   void main()
   {
       auto key = "YOUR_API_KEY";
       auto ip = "8.8.8.8";
       ushort code;
       auto reason = "";
   
       auto url = "https://api.ip2location.io/?format=json&key=" ~ key ~ "&ip=" ~ ip;
       string content = "";
       auto client = HTTP(url); // using "HTTP" instead of just "get" due to the need to read the page content when HTTP Status <> 200
       client.onReceive = (ubyte[] data) {
           content = content ~ to!string(cast(char[])(data));
           return data.length;
       };
       client.onReceiveStatusLine = (HTTP.StatusLine status) {
           code = status.code;
           reason = status.reason;
       };
       client.perform();
   
       if (code == 200)
       {
           JSONValue result = parseJSON(content);
           if ("proxy" in result)
           {
               if (result["proxy"]["is_vpn"].boolean)
               {
                   writefln("The IP %s is a VPN.", ip);
               }
               else
               {
                   writefln("The IP %s is NOT a VPN.", ip);
               }
           }
           else
           {
               writeln("ERROR: The is_vpn field requires a paid subscription to the Security plan.");
           }
       }
       else if ((code == 400) || (code == 401))
       {
           JSONValue result = parseJSON(content);
           if ("error" in result)
           {
               writefln("ERROR: %s", result["error"]["error_message"].str);
           }
           else
           {
               writefln("ERROR: %s", reason);
           }
       }
       else
       {
           writeln("ERROR: Unable to call API.");
       }
   }
   			

3. In the command line, run the below commands to compile and run the test code.
   Bash

   
   dmd test.d
   ./test
   			

This script will check if the specified IP address is a VPN. Make sure to replace 8.8.8.8 with the IP address you want and replace YOUR_API_KEY to your own API key.

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