JavaScript: Check whether a given value is US zip code or not

JavaScript validation with regular expression: Exercise-12 with Solution

Validate US Zip Code

Write a JavaScript function to check whether a given value is a US zip code or not.

Sample Solution:

JavaScript Code:

function is_usZipCode(str)
{
 regexp = /^[0-9]{5}(?:-[0-9]{4})?$/;
  
        if (regexp.test(str))
          {
            return true;
          }
        else
          {
            return false;
          }
}

console.log(is_usZipCode("03201-2150"));

console.log(is_usZipCode("7892"));

Output:

true
false

Flowchart:

Live Demo:

See the Pen javascript-regexp-exercise-12 by w3resource (@w3resource) on CodePen.

For more Practice: Solve these Related Problems:

• Write a JavaScript function that uses a regular expression to check if a string is a valid 5-digit or 9-digit US zip code.
• Write a JavaScript function that validates a US zip code and returns a formatted version (e.g., 12345 or 12345-6789).
• Write a JavaScript function that accepts a string and tests it against both 5-digit and ZIP+4 patterns.
• Write a JavaScript function that handles non-numeric inputs by returning an error if the input is not a valid zip code.

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