What is localStorage?

Local Storage let us save the data which is stored in the browser even when a user refreshes or closes a page. Let's know more about what is Local Storage in JavaScript.

Local Storage holds 2 - 100MB+ data. Saved all data in string(JSON) format. It is also useful for web interface data. It is also used for offline storage of data.

It has 3 three types of methods

• Read Data
• Write Data
• Delete Data

Methods

• setItem(k,v) - Add key and value to local storage
• getItem(k) - Retrieve a value by the key
• removeItem(k) - Remove an item by key
• clear() - Clear all storage

setItem()

let itemsArray = {
   id: "OWUAIJFNSOTEKSMJUFTHDSUQ", 
   name: "Rahul"
 }
 localStorage.setItem('items', JSON.stringify(itemsArray)); 

getItem()

const data = JSON.parse(localStorage.getItem('items')); 
console.log(data); 

Note: JSON.parse() is used to covert the contents of localStorage back into something which we can work with later in the data variable.

removeItem()

When passed a key name, the removeItem() method will remove that key from the storage if it exists. If there is no item associated with the given key, this method will do nothing.

localStorage.removeItem('items'); 

clear()

This method, when invoked, clears the entire storage of all records for that domain. It does not receive any parameters.

localStorage.clear(); 

Limitations

• Do not store sensitive user information in localStorage.
• It is not a substitute for a server-based database as information is only stored on the browser.
• localStorage is limited to 5MB across all major browsers.
• localStorage is quite insecure as it has no forms of data protection and can be accessed by any code on your web page.
• localStorage is synchronous, meaning each operation called would only execute one after the other.

Originally at => https://rahulism.tech/article/complete-guide-to-local-storage/

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