In my first file : pro.js
const newly = async function getBalance(account,address){
    
    const resp = await fetch(
      `https://api-link`,
      {
        method: 'GET',
        headers: {
          'api-key': ....
        }
      }
    );
    
    account = await resp.json();
    return account;
  }
module.exports = {
    newly
}
second file : index.js
const myNewly = require('./pro');
app.post('/getBalance/type',jsonParser,function(req,res){
  
  console.log(myNewly.newly(account,req.body.address)); // return Promise { <pending> }
  
  res.send(myNewly.newly(account,req.body.address)); // return nothing in postman
  
})
 
    