Validate a postcode without using a database.

validate_postcode_api.js

<script>
// ****************************************
// Checks if a postcode is valid
// ****************************************
function postcodeValid(postcode) {
    var result;
    $.get( "https://api.postcodes.io/postcodes/" + postcode + "/validate", function(data) {
        result = data['result'];
    });
    return result;
}
// ****************************************



// ****************************************
// * Get details about a postcode
// ****************************************
function postcodeValid(postcode) {
    var result;
    $.get( "https://api.postcodes.io/postcodes/" + postcode, function(data) {
        result = data;
    });
    return result;
}
// ****************************************
</script>