JSON - Cheat sheet

Introduction

• stands for JavaScript Object Notation
• easy to read and write.
• language agnostic data-interchange format
• filename extension is .json
• Internet Media type is application/json

Examples

{
  "name": "Jason",                      //value is `string`
  "age": 39,                            //value is `number`
  "height": 1.92,                       //value is `number.fraction`
  "gender": "M",                        //value is `string`
  "salary": 70000,                      //value is `number`
  "married": true,                      //value is `number`
  "children": [                         //value is `array`
    {"name": "Tom", "age": 9, "gender":"M"},
    {"name": "Ava", "age": 7, "gender":"F"}
  ]
}

Data Types

Type	Description
String	Series of characters
Number	Double precision floating-point
Boolean	true or false
Array	Ordered sequence of values
Value	String, Number, Boolean, null etc
Object	Unordered collection of key/value pairs
null	Null or Empty

String

Symbol	Description
"	Double quote
\	Backslash
/	Forward slash
\b	Backspace
\f	Form feed
\n	Newline
\r	Carriage return
\t	Tab
\u	Trailed by four hex digits

Number

Type	Description
Integer	Digits 1-9, 0 and positive or negative
Fraction	Fractions like 0.3, 3.9
Exponent	Exponent like e, e+, e-, E, E+, E