Zip code validation javascript
The United States Postal Service (USPS) uses a zipcode to identify mail. It is a 5-digit number that includes an optional hyphen and 4 additional digits.
It's important to validate addresses before mailing to ensure your mail gets delivered. Incorrect postal addresses can lead to returns, higher postage costs, and longer shipping times. Using a postal address verification tool, like Experian's free USPS address lookup tool, helps you ensure your address lists are accurate and improves deliverability.
Using the js code below, you can verify if the user enters a valid zipcode in your form. If it is not valid, then a message will be displayed telling the user that their zipcode is not valid.
This is a naive JavaScript function that only checks if a given string contains a valid US zipcode. It supports both the 5 digit and 9 digit (ZIP+4) formats. It can be called from inside your existing form validation script.
It also has a cool feature that's a bit harder to explain than the rest, but it consists of a special function that tries to find the first three digits in a string and then calls a function to determine if these are the correct number of digits.
This function is a must have for any JavaScript programmer or web developer who needs to check if a string contains the appropriate number of digits for a zipcode. It has been designed to be easy to use, and is compatible with any browser.
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