const promiseFour = new Promise(function(resolve, reject){
    setTimeout(function(){
        let error = true
        if (!error) {
            resolve({username: "hitesh", password: "123"})
        } else {
            reject('ERROR: Something went wrong')
        }
    }, 1000)
})

 promiseFour
 .then((user) => {
    console.log(user);
    return user.username
}).then((username) => {
    console.log(username);
}).catch(function(error){
    console.log(error);
}).finally(() => console.log("The promise is either resolved or rejected"))



https://github.com/hiteshchoudhary/js-hindi-youtube/blob/main/09_advance_one/promises.js