Check if the website exists and if not then display Error message under the Form Input Field

I'm fairly new to JS & React and I'm using React Hook Form I have to check if the Website entered into the Website field in my form exists or not. If the URL doesn't exist I have to show an error message as "Website not available" under the Website field which will get rendered using a FormError component.

(This is a First Name field but since I'm using a common TextField Component it should work here as well)

So, I'm using "url-exists" package to test if a website URL exists and if the website doesn't exists it should generate an error as "Website not available".

I'm using this code to implement.

const websiteCheck = (value) => {
  let str = value;
  let message = "";
    let urlCheck = str.indexOf("http://") == 0 || str.indexOf("https://") == 0;
    if (!urlCheck) {
        console.log("Protocol doesn't exist!");
        str = "http://" + str;
    } else {
        console.log("Protocol exists!");
    }
    urlExists(str, function (err:any, exists:any) {
      if (!exists) {
        message = "Website doesn't exists!" //Just for testing
        console.log("Not available: ", str, exists);
      } else {
        message = "Website exists!"
        console.log("Available: ", str, exists);
    }
        // console.log(exists); // true
    });
  return message;
}

And I'm calling it as :

return(
.....
 <TextField
        key={fieldName}
        id={fieldName}
        .......
        inputRef={register({
            websiteCheck(value)
       ........
 />

This should ideally work but it's giving me "Not available" message in console.log() even if I enter a correct & valid URL. And it still won't render the message I set.

What I found so far from debugging is :

1. When I submit my form my entered URL is accepted but it won't enter my if(!exists)..else block and I get "Not available" in console.
2. The second time it's submitting null value (or space idk) which enters the if(!exists)...else block and also says "Not available"

What should I do to get this resolved?