function getLocalItems(k){
if (k){
try{
return JSON.parse(localStorage.getItem(k))
} catch(e){
return localStorage.getItem(k)
}
}
}
function setLocalItems(k, value){
if (typeof value === 'object') {
value = JSON.stringify(value)
}
localStorage.setItem(k, value)
}
// Put all entries in an object «store»
let store = {}
for (let i = 0, l = localStorage.length; i < l; i++) {
store[localStorage.key(i)] = getLocalItems(localStorage.key(i))
}
console.log(store)
// Write all keys of «store» in localStorage
for (let o in store) {
setLocalItems(o, store[o])
}
function dump(storage) {
let store = []
for (let i = 0, l = storage.length; i < l; i++) {
let key = storage.key(i);
store.push({ key: key, value: storage.getItem(key) });
}
console.log(JSON.stringify(store))
}
function restore(storage, store, clearBefore) {
if (clearBefore) {
storage.clear();
}
for (let i = 0, l = store.length; i < l; i++) {
let item = store[i];
storage.setItem(item.key, item.value);
}
}
// usage:
//
// dump(localStorage); // manual step: copy log output to text file
// dump(sessionStorage);
//
// let contentsFromTextFile = [ ... ]; // manual step: paste from text file
// restore(localStorage, contentsFromTextFile, true);
// restore(sessionStorage, contentsFromTextFile, true);
//
//
// EXAMPLE
// -------
// Given localStorage has one entry with key "foo" and value "bar"
// And I pasted the above code into the console
//
// When I run
// dump(localStorage)
// Then I see the log output
// [{"key":"foo","value":"bar"}]
//
// When I run
// restore(localStorage, [{"key":"foo2","value":"bar2"}], true);
// Then localStorage contains only one entry with key "foo2" and value "bar2"
//
// When I run
// restore(localStorage, [{"key":"foo3","value":"bar3"}], false);
// Then localStorage contains two entries,
// one entry with key "foo2" and value "bar2" and
// one entry with key "foo3" and value "bar3"