Javascript: Retrieve all keys from sessionStorage?

With this you can assign all the data in local storage into an object:

let storage = {}
Object.keys(localStorage).forEach((key) => {
    storage[key] = localStorage.getItem(key);
});

You can use the Object.keys() and reduce():

var obj = Object.keys(localStorage).reduce(function(obj, key) {
   obj[key] = localStorage.getItem(key);
   return obj
}, {});

console.log(obj)

to get a list that shows the keys name and city

Use Object.keys() function:

sessionStorage.name = 'John';
sessionStorage.city = 'New York';

console.log(Object.keys(sessionStorage));

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