Validate US Zip Code using JavaScript

Here’s how to validate US Zip code using JavaScript. We will be using a Regular Expression to do so.

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title>Validate US Zip Code in JavaScript</title>
    <script type="text/javascript">
        function IsValidZipCode(zip) {
            var isValid = /^[0-9]{5}(?:-[0-9]{4})?$/.test(zip);
            if (isValid)
                alert('Valid ZipCode');
            else {
                alert('Invalid ZipCode');
            }
        }
    </script>
</head>

<body>
<form>
<input id="txtZip" name="zip" type="text" /><br />
<input id="Button1" type="submit" value="Validate"
onclick="IsValidZipCode(this.form.zip.value)" />
</form>
</body>
</html>

The code above validates a US zip code based on both the five digit (12345) as well as nine-digit (12345-1234 ) schemes.

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About The Author

Suprotim Agarwal, Developer Technologies MVP (Microsoft Most Valuable Professional) is the founder and contributor for DevCurry, DotNetCurry and SQLServerCurry. He is the Chief Editor of a Developer Magazine called DNC Magazine. He has also authored two Books - 51 Recipes using jQuery with ASP.NET Controls. and The Absolutely Awesome jQuery CookBook.

Follow him on twitter @suprotimagarwal.

6 comments:

Stela James said...: Thanks for code!
home jobs; July 19, 2010 at 12:10 AM
Relationals said...: Nice, but it doesn't validate the actual zip code, just the xxxxx-xxxx.
PaaS for ISVs; July 23, 2010 at 10:08 AM
Unknown said...: Hi Excellent.. But it is not validating..
just try with /\d{5}-\d{4}$|^\d{5}$/.test(zip); May 14, 2015 at 10:01 PM
Unknown said...: i made a slightly change and work for my

function ValidateUSZipCode(zipcode)
{
var zipcodeformat = /^[0-9]{5}(?:-[0-9]{4})?$/;

if(zipcode.match(zipcodeformat))
{
console.log("correct zip");
}
else
{
console.log("incorrect zip");
return false;
}
}

thanks!!; June 17, 2016 at 10:11 AM
Unknown said...: i made a slightly change and work for my

function ValidateUSZipCode(zipcode)
{
var zipcodeformat = /^[0-9]{5}(?:-[0-9]{4})?$/;

if(zipcode.match(zipcodeformat))
{
console.log("correct zip");
}
else
{
console.log("incorrect zip");
return false;
}
}

i hope work for you!!; June 17, 2016 at 10:12 AM
Unknown said...: How could i enter certain zip codes and recognize only those for valid ?
thank you in advance; January 26, 2017 at 7:17 AM