About JSON

1. JavaScript JSON
• JSON is a format for storing and transporting data.
• What is JSON?
• JSON stands for JavaScript Object Notation
• JSON is a lightweight data interchange format
• JSON is language independent *
• JSON is "self-describing" and easy to understand

2. • XML is a format for storing and transporting data.---TAGS
• JSON is a format for storing and transporting data.---PLAIN TEXT

3. • <employees>
<employee>
<firstName>John</firstName>
<lastName>Doe</lastName>
</employee>
<employee>
<firstName>Anna</firstName>
<lastName>Smith</lastName>
</employee>
<employee>
<firstName>Peter</firstName>
<lastName>Jones</lastName>
</employee>
</employees>

4. • <employees>
<employee>
<firstName>John</firstName>
<lastName>Doe</lastName>
</employee>
<employee>
<firstName>Anna</firstName>
<lastName>Smith</lastName>
</employee>
<employee>
<firstName>Peter</firstName>
<lastName>Jones</lastName>
</employee>
</employees>
{"employees":
[
{ "firstName":"John", "lastName":"Doe" },
{ "firstName":"Anna", "lastName":"Smith" },
{ "firstName":"Peter", "lastName":"Jones" }
]
}

5. JSON Data Types
• Valid Data Types
• In JSON, values must be one of the following data types:
• a string
• a number
• an object (JSON object)
• an array
• a boolean
• null
JSON values cannot be one of the following data types:
a function
a date
undefined

6. JSON Strings
• Strings in JSON must be written in double quotes.
• Example
• {"name":"John"}

7. JSON Numbers
• Numbers in JSON must be an integer or a floating point.
• Example
• {"age":30}

8. JSON Objects
• Values in JSON can be objects.
• Example
• {
"employee":{"name":"John", "age":30, "city":"New York"}
}

9. JSON Arrays
• Values in JSON can be arrays.
• Example
• {
"employees":["John", "Anna", "Peter"]
• “responsibiliteis":[“mgr", “promoter"]
}

10. JSON Booleans
• Values in JSON can be true/false.
• Example
• {"sale":true}

11. JSON null
• Values in JSON can be null.
• Example
• {"middlename":null}

12. • <employees>
• <employee>
• <name>Shyam</name>
• <email>shyamjaiswal@gmail.com</email>
• </employee>
• <employee>
• <name>Bob</name>
• <email>bob32@gmail.com</email>
• </employee>
• <employee>
• <name>Jai</name>
• <email>jai87@gmail.com</email>
• </employee>
• </employees>
• {"employees":[
• {"name":"Shyam", "email"
:"shyamjaiswal@gmail.com"
},
• {"name":"Bob", "email":"b
ob32@gmail.com"},
• {"name":"Jai", "email":"jai
87@gmail.com"}
• ]}

13. JSON Nested Object Example
• A JSON object can have another object also. Let's see a simple example of JSON object having
another object.
• {
• "firstName": "Sonoo",
• "lastName": "Jaiswal",
• "age": 27,
• "address" : {
• "streetAddress": "Plot-6, Mohan Nagar",
• "city": "Ghaziabad",
• "state": "UP",
• "postalCode": "201007"
• }
• }

14. Ajax
Asynchronous Java script And XML