Storing Objects in HTML5 localStorage
I'd like to store a JavaScript object in HTML5 localStorage, but my object is apparently being converted to a string.
I can store and retrieve primitive JavaScript types and arrays using localStorage, but objects don't seem to work. Should they?
Here's my code:
var testObject = { 'one': 1, 'two': 2, 'three': 3 };
console.log('typeof testObject: ' + typeof testObject);
console.log('testObject properties:');
for (var prop in testObject) {
console.log(' ' + prop + ': ' + testObject[prop]);
}
// Put the object into storage
localStorage.setItem('testObject', testObject);
// Retrieve the object from storage
var retrievedObject = localStorage.getItem('testObject');
console.log('typeof retrievedObject: ' + typeof retrievedObject);
console.log('Value of retrievedObject: ' + retrievedObject);
The console output is
typeof testObject: object
testObject properties:
one: 1
two: 2
three: 3
typeof retrievedObject: string
Value of retrievedObject: [object Object]
It looks to me like the setItem method is converting the input to a string before storing it.
I see this behavior in Safari, Chrome, and Firefox, so I assume it's my misunderstanding of theHTML5 Web Storage spec, not a browser-specific bug or limitation.
I've tried to make sense of the structured clone algorithm described inhttp://www.w3.org/TR/html5/infrastructure.html. I don't fully understand what it's saying, but maybe my problem has to do with my object's properties not being enumerable (???)
Is there an easy workaround?
html
Javascript
- asked 9 years ago
- B Butts
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