General Information
• Data is in key/value pairs |
• Data groups by colon ":" and separates by comma "," |
• Objects are surrounded with curly braces "{" and "}" |
• Each key in objects should be unique |
• Arrays are surrounded with square brackets "[" and "]" |
• Light, human-readable data-interchange format |
• Can be used with modern programming languages |
• Language independent |
• The trailing commas and leading zeros are prohibited |
• Numbers can't have octal or hexadecimal format |
• Easy to use and doesn't use full markup like XML |
• Popular due to it's asynchronous speed |
• Extension for Json files is ".json" |
• Mime type for Json texts is "application/json" |
• Official media type for Json is "application/json" |
• Json internet media type is "application/json" |
• The uniform type identifier for Json is "public.json" |
Data Types
Json |
Python |
Possible Values |
boolean |
bool |
true | false |
number |
float |
123 | 123.456 | 1234e-3 |
string |
str |
"abcdef" | "" |
array |
list |
["a", "b", "c", "d"] |
object |
dict |
{"id": 7} |
null |
None |
null |
Escape Sequences
Name |
Sequence |
Double Quote |
\" |
Backslash |
\\ |
Slash |
\/ |
Backspace (BS) |
\b |
Form Feed (FF) |
\f |
Horizontal Tab (HT) |
\t |
Newline (NL) |
\n |
Carriage Return (CR) |
\r |
Hexadecimal |
\uXXXX |
Arrays
Syntax |
Description |
arr = [] |
Empty Array |
arr = ["James"] |
Single Element Array |
arr = [
"James",
"Bond",
42,
"M",
{"Germany": "Berlin"},
true
]
|
Multi Element Array
Firstname
Lastname
Age
Sex
Location
Available |
Objects
Syntax |
Description |
obj = {} |
Empty Object |
obj = {"key": value} |
Single Element Object |
obj = {
"Firstname": "Jane",
"Lastname": "Doe",
"Age": 39,
"Sex": "F",
"Location": {"DE": "Berlin"},
"Availability": false
}
|
Multi Element Object
Firstname
Lastname
Age
Sex
Location
Availability |
Nested Object and Arrays
nested = {
"indexes": {
"Firstname": 0,
"Lastname": 1,
"Age": 2,
"Sex": 3,
"Country": 4,
"Available": 5
},
"user": [
"James",
"Bond",
42,
"M",
{"Germany": "Berlin"},
true
]
}
|
Nested Objects and Arrays
nested = { |
"defaults": { |
"First": 0, |
"Last": 1, |
"Age": 2, |
"Sex": 3, |
"Country": 4, |
"Available": 5 |
}, |
"husband": [ |
"James", |
"Bond", |
"42", |
"T", |
"Germany", |
true |
], |
"wife": [ |
"Jane", |
"Honda", |
"42", |
"T", |
"Germany", |
false |
] |
} |
Arrays
array = [] |
Empty Array |
array = ["James"] |
Single Element Array |
array = [ |
Multi Element Array |
"James", |
"Bond", |
"42", |
"T", |
"Germany", |
true |
] |
Objects
myobject = {} |
Empty Object |
myobject = {"key": value} |
Single Element Object |
myobject = { |
Multi Element Object |
"First": "James", |
"Last": "Bond", |
"Age": "42", |
"Sex": "T", |
"Country": "Germany", |
"Available": true |
} |
Syntax |
Description |
arr = [] |
Empty Array |
arr = ["Username"] |
Single Element Array |
arr = [
"James",
"Bond",
42,
"M",
{"Germany": "Berlin"},
true
]
|
Multi Elements Array |
Data Types
boolean |
true, false |
number |
123, 123.456, 1.234e-3 |
string |
"abcdef", "" |
array |
["a", "b", "c", "d"] |
object |
{"id": 7} |
null |
null |
General Information
• Doesn't have comments. Everything in it is considered data |
• Data is in name/value pairs. Grouped by a colon ":" and separated by comma "," |
• Objects are surrounded with curly braces. Each key within should be unique and enclosed within the double quotes. An object begins with a left brace "{" and ends with a right brace "}" |
• Arrays are surrounded with square brackets. An array begins with a left bracket "[" and ends with a right bracket "]" |
• The trailing commas and leading zeros are prohibited |
• Numbers can't have octal or hexadecimal format |
• Lightweight and human-readable data-interchange format |
• Can be used with modern programming languages |
• Language independent |
• Very easy to parse and generate and doesn’t use a full markup structure like a XML |
• Popular alternative to XML format for its fast asynchronous client–server communication |
• Extension for json files is ".json" |
• Mime type for json texts is "application/json" |
• The official media type for json is "application/json". |
• json internet media type is "application/json". |
• The uniform type identifier is "public.json" |
Escape Sequences
Double Quote |
\" |
Backslash |
\\ |
Slash |
\/ |
Backspace (BS) |
\b |
Form Feed (FF) |
\f |
Horizontal Tab (HT) |
\t |
Newline () |
\n |
Carriage Return |
\r |
Hexadecimal |
\uXXXX |
|
|
|
