env file

cp .env.example .env


# Edit the resulting file:
vi .env
# or:
nano .env




// Domain Validation
domainValidation(url) {
     const urlRegex = /^(((http|https):\/\/|)?[a-z0-9]+([\-\.]{1}[a-z0-9]+)*\.[a-z]{2,6}(:[0-9]{1,5})?(\/.*)?)$/;
     if (urlRegex.test(url)) {
          return true;
      } else {
          return false;
      }
};


const urlRegex = /(?:[a-z0-9](?:[a-z0-9-]{0,61}[a-z0-9])?\.)+[a-z0-9][a-z0-9-]{0,61}[a-z0-9]/g;

 const urlHttpsRegex = /^(http(s):\/\/.)[-a-zA-Z0-9@:%._\+~#=]{2,256}\.[a-z]{2,6}\b([-a-zA-Z0-9@:%_\+.~#?&//=]*)$/g;


const domainRegex = /^[a-z0-9]+([\-\.]{1}[a-z0-9]+)*\.[a-z]{2,6}$/i;

const domainAndUrlRegEx = /^(((http|https):\/\/|)?[a-z0-9]+([\-\.]{1}[a-z0-9]+)*\.[a-z]{2,6}(:[0-9]{1,5})?(\/.*)?)$/;
const isUrlCorrect = new URL("https://paywithpi.com/");
console.log(isUrlCorrect)



const isUrlCorrect = new URL("https://paywithpi.com");
console.log(isUrlCorrect)


url contructor 
function isUrlValid(string) {
 try {
   new URL(string);
   return true;
 } catch (err) {
   return false;
 }
}



function isHttpValid(str) {
 try {
   const newUrl = new URL(str);
   return newUrl.protocol === 'http:' || newUrl.protocol === 'https:';
 } catch (err) {
   return false;
 }
}
console.log(isHttpValid('https://www.example.com/')); // true
console.log(isHttpValid('mailto://example.com')); // false




function isUrlValid(str) {
 const pattern = new RegExp(
   '^(https?:\\/\\/)?' + // protocol
     '((([a-z\\d]([a-z\\d-]*[a-z\\d])*)\\.)+[a-z]{2,}|' + // domain name
     '((\\d{1,3}\\.){3}\\d{1,3}))' + // OR IP (v4) address
     '(\\:\\d+)?(\\/[-a-z\\d%_.~+]*)*' + // port and path
     '(\\?[;&a-z\\d%_.~+=-]*)?' + // query string
     '(\\#[-a-z\\d_]*)?$', // fragment locator
   'i'
 );
 return pattern.test(str);
}








.env file
# Add your API key here:
PI_API_KEY=https://paywithpi.com/validation-key.txt

# Add your session secret here:
SESSION_SECRET=f7d8531b796b28a6223d7045dc9e437cc6f1a8b07932db982885dc293f6855d55c8cd09739ab0f2e24b74797ee5dbb5a999eba3e602b0d69304f1c3df0eb6ed0