JSON Module #28

Question 1

What types of data does JSON support?

Answer 1

Number: any number that’s not wrapped in quotes

String: any set of characters wrapped in quotes

Boolean: true or false
Array: a list of values, wrapped in square brackets

Object: a set of key-value pairs, wrapped in curly brackets

null: the null word, which represents an empty value

Any other data type that’s more complex than this must
be serialized to a string (and then de-serialized) in order to be stored in JSON.

Question 2

Which method will return an object that contains the parsed JSON

Answer 2

JSON.parse takes a JSON string as its parameter, and returns an object that contains the parsed JSON:

Question 3

What does JSON.stringify( ) do?

Answer 3

JSON.stringify() takes a JavaScript object as its parameter, and returns a string that represents it in JSON:

Question 4

Which second argument does JSON accept

Answer 4

The reviver function: You can use that to customize the JSON parsing and perform any custom operation:

JSON.parse(string, (key, value) => {
  if (key === "name") {
    return `The name is ${value}`
  } else {
    return value
  }
})