JSON

Question 1

What is JSON?

Answer 1

Javascript object notation format for storing and transporting the data

Question 2

What are serialization and deserialization?

Answer 2

Serialization convert an object into a string, Deserialization convert string in to object

Question 3

Why are serialization and deserialization useful?

Answer 3

Easier to transfer data

Question 4

How do you serialize a data structure into a JSON string using JavaScript?

Answer 4

JSON.stringify()

Question 5

How do you deserialize a JSON string into a data structure using JavaScript?

Answer 5

JSON.parse()

Question 6

How to you store data in localStorage?

Answer 6

localstorage.setItem(key name, key value)

Question 7

How to you retrieve data from localStorage?

Answer 7

localstorage.getItem(key name)

Question 8

What data type can localStorage save in the browser?

Answer 8

String

Question 9

When does the ‘beforeunload’ event fire on the window object?

Answer 9

When the window, the document and its resources are about to be unloaded.