published: 06 Sep 2022
2 min read
Storing and retrieving objects in local storage using JavaScript
The HTML web storage API offers a way to store a large amount of data (5MB+) in a user's browser without affecting the website performance.
By default, both web storage objects - localStorage and sessionStorage - allows us to store only string key-value pairs:
const user = { name: 'Alex', job: 'Software Engineer' };
localStorage.setItem('user', user);
console.log(localStorage.getItem('user')); // [object Object]
If you want to store an entire JavaScript object, you first need to serialize it into a string by using the JSON.stringify() method:
const user = { name: 'Alex', job: 'Software Engineer' };
localStorage.setItem('user', JSON.stringify(user));
console.log(localStorage.getItem('user'));
// {'name':'Alex','job':'Software Engineer'}
To retrieve the JavaScript object from localStorage, use the getItem() method. You still need to use the JSON.parse() method to parse the JSON string back to an object:
// Retrieve the JSON string
const userStr = localStorage.getItem('user');
// Parse JSON string to object
const userObj = JSON.parse(userStr);
// Print object attributes
console.log(userObj.name); // Alex
console.log(userObj.job); // Software Engineer
To learn more about localStorage and sessionStorage objects, take a look at this article.
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Storing and retrieving objects in local storage using JavaScript
The HTML web storage API offers a way to store a large amount of data (5MB+) in a user's browser without affecting the website performance.
By default, both web storage objects - localStorage and sessionStorage - allows us to store only string key-value pairs:
const user = { name: 'Alex', job: 'Software Engineer' };
localStorage.setItem('user', user);
console.log(localStorage.getItem('user')); // [object Object]
If you want to store an entire JavaScript object, you first need to serialize it into a string by using the JSON.stringify() method:
const user = { name: 'Alex', job: 'Software Engineer' };
localStorage.setItem('user', JSON.stringify(user));
console.log(localStorage.getItem('user'));
// {'name':'Alex','job':'Software Engineer'}
To retrieve the JavaScript object from localStorage, use the getItem() method. You still need to use the JSON.parse() method to parse the JSON string back to an object:
// Retrieve the JSON string
const userStr = localStorage.getItem('user');
// Parse JSON string to object
const userObj = JSON.parse(userStr);
// Print object attributes
console.log(userObj.name); // Alex
console.log(userObj.job); // Software Engineer
To learn more about localStorage and sessionStorage objects, take a look at this article.
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