A JSON body can comprise of one of 6 data types which can be categorized as primitive and complex data types.
- String (Primitive)
- Boolean (Primitive)
- Null (Primitive)
- Number (Primitive)
- Object (Complex)
- Array (Complex)
JSON Primitive / Simple Data Types
1. JSON String Datatype
String, as usual, must be written within double quotes like any other. String supports various special character as well including
- \\ (backslash)
- \" (Double Quotes)
- \/ (forward slash)
- \b (backspace)
- \n (new line)
- \r (carriage return)
- \t (horizontal tab)
- \f (form feed)
- \u (trailed by 4 hex digits)
{"Hero": "Eren"}
2. JSON Boolean Datatype
- Values can either be true or false in this.
- Do not surround boolean with double quotes
{"Paid": true}
3. JSON Null
- It is just a null or empty value. When no value is assigned to key it is treaded as null.
- null is a special value in JSON
- null is also not surrounded by double quotes
{"LastName": null}
4. JSON Number
- Either JSON must use integer or float here.
- Octal and hexadecimal values are not used.
- Also Nan and infinity values are not allowed.
- Include digits 0-9
- can be a negative number -5
- can be a fraction value .5
- can include exponent of 10, prefixed by e or E
- Numbers are not surrounded by double quotes
{"Points": 10}
JSON Complex / Compound / Structure Data Types
1. JSON Object
- JSON values can also be objects with properties of key-value pairs.
- Objects are enclosed within curly braces. Starts with { and ends with }.
{"employee":{"Hero":"Naruto", "age":30, "city":"HiddenLeaf"}}
2. JSON Array
- JSON body can also represent JSON values in the form of an array list.
- It is an ordered collection of values. Arrays starts with [ and ends with ] bracket.
{"Stones": ["Time","Mind","Power"]}
JSON value cannot comprise of these:
- Function
- Date
- Undefined
JSON Body Example
{
"store": {
"rice": [
{
"category": "brown rice",
"brand": "oro brown rice",
"price": 8.95
},
{
"category": "red rice",
"brand": "blured red rice",
"price": 12.99
}
],
"milk": {
"color": "blue",
"price": 19.95
}
},
"expensive": 30
}
So these are the datatypes and conditions to be followed while creating and giving values to a JSON body structure.
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