JSON Files

Question 1

JSON Stands for

Answer 1

JavaScript Object Notation and was inspired by JavaScript

Question 2

Advantages of JSON

Answer 2

-Easy to read and write
-Lange independent
-Same syntax as JavaScript Objects
-Store application data

Question 3

When exchanging data between a browser and a server

Answer 3

data can be text, but JSON can be easily converted into objects

Question 4

Jason Uses 2 Structures

Answer 4

Name, Value pairs,
which in many languages can be referred to as an object,
struct, or dictionary
An ordered list of values
which in many languages this is referred to as an array or
list

Question 5

What extension do JSON files have

Answer 5

.json extension

Question 6

JSON Values

Answer 6

JSON values can be the following:

Strings: Enclosed in double quotes
{“name”: “Gina”}

Numbers
{“age”: 29}

True or False
{“allergies”: true}

Null
{“faxNumber”: null}

Objects
{
“patient”: {“name”: “Gina”, “age”: 29, “city”: “Columbus”}
}

Arrays
{
“patients”: [“Gina”, “Rick”, “ed”, “Russ”]
}

Question 7

JSON Objects

Answer 7

These structures can also be nested. JSON data types cannot be a function, date, or undefined. JSON objects are name/value pairs separated by colons. Pairs are separated by commas and enclosed by curly braces.

{
“storeName”: “Starlight cafe”,
“owner”: “Fred Smith”
}

Arrays are enclosed by square brackets and separated by commas.

“items”: [“banana”, “coffee”, “muffin”]

Arrays can be anything including a collections of objects (nested).

Question 8

JavaScript has a built-in function that converts

Answer 8

a string into a JavaScript Object

JSON.parse()

Question 9

When receiving _____ from a ______, it can be used as any JavaScript object. All objects are written as Key/Value pairs and Keys must be ______.

Answer 9

data
server
strings

Nesting JSON objects (books 1-4 are nested in books)

myObj = (
“name”: “Gina”,
“age”: 29,
“books”: {
“book1”: “Harry Potter”,
“book2”: “Percy Jackson”,
“book3”: Thrawn”,
“book4”: “Mistborn”
}
}

Question 10

JSON Exceptions

Answer 10

Dates and functions are not allowed but they can be written as strings and converted later

Date to Convert to a String
var strPerson = ‘ {“name”: “Gina”, “birthday”: “1992-07-05”, “state”: “OH”}’;
var obj = JSON.parse(strPerson);

Parsing Functions
var strPerson = ‘{ “name”: “Gina”, “age”: “function () {return 29;}”, “state”: “OH”}’ ;
var obj = JSON.parse(strPerson) ;

Question 11

JSON Versus XML

Answer 11

JSON
-Easy to read and understand
-Hierarchical
-No tags needed
-Easy to use with JavaScript
-Lightweight and fast
-Can use arrays

XML
-Easy to read and understand
-Hierarchical
-Requires an XML parser
-Supports more complex data types such as datetime
-Supports namespace