CODEWITHSUNDEEP
javascriptparsingip-address
Chris Dutrow
Chris Dutrow

Reputation: 50362

IP Address Parser in Javascript

Looking for a good IP address parser for Javascript.

Ideally, it could take in an IP address as a string, then return an object containing all of the pieces of the IP Address, including the port.

Thanks!

Upvotes: 12

Views: 8803

Answers (4)

groovecoder
groovecoder

Reputation: 1581

I came across this question while implementing Safe Browsing url canonicalization in JS. The answers here are helpful, and here's some JS I came up with that does octal & hex IP addresses, in case it's helpful to anyone else in the future:

function verifyIP4(address) {
  var ip4DecimalPattern = '^(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?))$';
  var ip4HexPattern = '^(?:(?:0x[0-9a-f]{1,2})\.){3}(?:0x[0-9a-f]{1,2})$';
  var ip4OctalPattern = '^(?:(?:03[1-7][0-7]|0[12][0-7]{1,2}|[0-7]{1,2})\.){3}(?:03[1-7][0-7]|0[12][0-7]{1,2}|[0-7]{1,2})$';

  var isIP4Decimal = isIP4Hex = isIP4Octal = false;
  var base = 10;

  isIP4Decimal = address.match(ip4DecimalPattern) != null;
  isIP4Hex = address.match(ip4HexPattern) != null;
  isIP4Octal = address.match(ip4OctalPattern) != null;

  if (isIP4Hex || isIP4Octal) {
    if (isIP4Hex) {
      base = 16;
    } else if (isIP4Octal) {
      base = 8;
    }
    return address.split('.').map(num => parseInt(num, base)).join('.');
  }
  return false;
}

Upvotes: 1

Chris Dutrow
Chris Dutrow

Reputation: 50362

This is what I came up with.

  • It parses the old kind of IP addresses, not the new IPv6.
  • It also does not do validation which would only be a hindrance for my use case.

::

// REGEX to break an ip address into parts
var ip_regex = /(\d+)\.(\d+)\.(\d+)\.(\d+)(?:\.(\d+))?(?::(\d+))?/ig;

// Parse the ip string into an object containing it's parts
var parse_ip_address = function(ip_string){

    // Use Regex to get the parts of the ip address
    var ip_parts = ip_regex.exec(ip_string);

    // Set ip address if the regex executed successfully
    if( ip_parts && ip_parts.length > 6 ){
        // Set up address object to elements in the list
        var ip_address = {
            'A':     ip_parts[1],
            'B':     ip_parts[2],
            'C':     ip_parts[3],
            'D':     ip_parts[4],
            'E':     ip_parts[5],
            'port':  ip_parts[6]
        }
        // Would rather not fiddle with 'undefined' value
        if( typeof ip_parts[5] != 'undefined') {
            ip_address[5] = null;
        }
    }

    // Return object
    return ip_parts;
};

Upvotes: 0

PinnyM
PinnyM

Reputation: 35533

var v4 = '[\\d]{1-3}';
var v4d = '\\.';
var v4complete = v4+v4d+v4+v4d+v4+v4d+v4
var v6 = '[\\da-fA-F]{0-4}';
var v6d = ':';
var v6complete = v6+v6d+v6+v6d+v6+v6d+v6+v6d+v6+v6d+v6+v6d+v6+v6d+v6;
var regex = new RegExp('(' + v4complete + '(\\:\d+){0,1}|'
                           + '::|::1|'
                           + '\\[::\\]:\\d+|\\[::1\\]:\\d+|'
                           + v6complete + '|'
                           + '\\[' + v6complete + '\\]:\\d+' + ')', 'g');
var result = mystring.match(regex);

Note that this doesn't guarantee valid addresses (in the range 0-255 for IPv4, for example). But it should match ip's with or without the port.

Upvotes: 2

Tomáš Zato
Tomáš Zato

Reputation: 53119

 function parseIP(ip) {
   if(ip.match(/^(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3})/)!=null)  {
     ip = ip.match(/(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)/);  //clean posible port or http://
      return ip.split(".");   //returns [a,b,c,d] array
   }
   else 
      return false;
 }

That will do it. Split method splits string by delimiter. Its opposite is Array.join(delimiter), which joins the array with optional delimiter between the pieces.

Upvotes: 2

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