JSON and Structured Data

JSON and Structured Data


JSON replace XML. lightweight data-interchange format. Often used with AJAX (send data forth back client, server, without refresh)

Data types:
number: no dfference between integer and floats
string: string of unicode characters “”
Boolean: true and false
array: ordered list of 0 and more values
Object: unordered collection of key/value pairs
Null: empty value

JSON Syntax Rules:
uses key/value pairs – {“name”;”brad”} .     uses double quotes around Key and value .     must use the specific data type .   file type is “.json” .   MIME type is “application/json”




strings: text enclosed in single or double quotation marks
numbers: integer or decimal, positive or negative
booleans: true or false, no quot marks
null: means “nothing,” no quot marks

arrays are lists in square brackets, comma separated, can mix data types

objects are JSON dictionaries in curly brackets, keys and values are separated by a colon, pairs are separated by commas. keys and values can be any data type, but string is the most common value for a key

nesting : arrays and objects inside each other
can put arrays inside objects, objects inside


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