What is JSON ?

• JavaScript Object Notation.
• Lightweight data-interchange format.
• Based on a subset of JavaScript.
• Easy to read and write.
• Often used with AJAX(Asynchronous JavaScript XML).
• Can be used with most modern languages.

Data Types

Number : No difference between integer and floats.
String : string of Unicode characters. Use double quotes.
Boolean : True or False.
Array : Ordered list of 0 or more values.
Object : Unordered collection of key/value pairs.
Null : Empty values.

💡 Tip One way to remember JSON-valid data types: BASONN:

• Booleans
• Arrays
• Strings
• Objects
• Numbers
• Null

JSON Syntax Rules

• Use key/value pairs - {"name":"John"}
• Uses double quotes around KEY and VALUES.
• Must use the specific data types.
• File type is ".json".
• MIME type is "Application/json".

JSON Example

{
    "name": "John",
    "age": 35,
    "address":{
        "street":"5 main street",
        "city": "Boston"
    },
    "children": ["Michel","Nick"]
}