How to Store JavaScript Objects in HTML5 localStorage

Use the JSON.stringify() Method

By default, the localStorage or sessionStorage only allows you to store string key/value pairs. But you can also store the JavaScript objects in web storage with a little trick.

To store objects first stringify it using the JSON.stringify() method, and later parse it with the JSON.parse() when you need retrieve it, as shown in the following example:

<script>
var personObject = { name: "Peter", age: 18, married: false };
    
// Convert the person object into JSON string and save it into storage
localStorage.setItem("personObject", JSON.stringify(personObject));
    
// Retrieve the JSON string
var jsonString = localStorage.getItem("personObject");
    
// Parse the JSON string back to JS object
var retrievedObject = JSON.parse(jsonString);
console.log(retrievedObject);
    
// Accessing individual values
console.log(retrievedObject.name); // Prints: Peter
console.log(retrievedObject.age); // Prints: 18
console.log(retrievedObject.married); // Prints: false
</script>