JSON
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The document provides an overview of JSON (JavaScript Object Notation), a lightweight alternative to XML for data interchange that began gaining popularity around 2006. It includes examples, a historical timeline, a specification comparison with XML, and concludes that JSON is faster for AJAX applications and should be included in modern data exchanges. The document emphasizes JSON's simplicity, stability, and efficiency in transmitting data.
![Example
This is a JSON object with five key-value pairs
Objects are wrapped by curly braces
There are no object IDs
Keys are strings
Values are numbers, strings, objects or arrays
Arrays are wrapped by square brackets
{
"firstName": "John",
"lastName" : "Smith", "age" : 25,
"address" :
{
"streetAdr” : "21 2nd Street", "city" : "New York",
"state" : "NY", ”zip" : "10021“
},
"phoneNumber":
[
{"type" : "home", "number": "212 555-1234"},
{"type" : "fax", "number” : "646 555-4567"}
]
}
5/23/2015 4](https://image.slidesharecdn.com/whyjsonnotxml-150427195637-conversion-gate02/85/JSON-4-320.jpg)
JSON
- 1. JSON JavaScript Object Notation By: Ibrahim Alibrahim ([email protected]) 23 May 2015 5/23/2015 1
- 2. Outlines Introduction Example Some History Specification JSON vs. XML Conclusion 5/23/2015 2
- 3. JSON - Introduction JSON is a light-weight alternative to XML for data-interchange JSON = JavaScript Object Notation ◦ It’s really language independent ◦ most programming languages can easily read it and instantiate objects or some other data structure Defined in RFC 4627 Started gaining tracking ~2006 and now widely used http://json.org/ has more information 5/23/2015 3
- 4. Example This is a JSON object with five key-value pairs Objects are wrapped by curly braces There are no object IDs Keys are strings Values are numbers, strings, objects or arrays Arrays are wrapped by square brackets { "firstName": "John", "lastName" : "Smith", "age" : 25, "address" : { "streetAdr” : "21 2nd Street", "city" : "New York", "state" : "NY", ”zip" : "10021“ }, "phoneNumber": [ {"type" : "home", "number": "212 555-1234"}, {"type" : "fax", "number” : "646 555-4567"} ] } 5/23/2015 4
- 5. Some History 1999: ECMA-262 2002: json.org 2006: RFC-4627 2006: AJAX 2013: ECMA-404 2014: RFC-7159 5/23/2015 5 JSON has no version number. JSON is stable.
- 6. JSON Specification (BNF) - 1 5/23/2015 6
- 7. JSON Specification (BNF) - 2 5/23/2015 7
- 8. JSON Specification (BNF) - 3 5/23/2015 8
- 9. JSON Specification (BNF) - 4 5/23/2015 9
- 10. JSON vs. XML (Data Exchange Formats) Criteria JSON XML AJAX The X in AJAX JavaScript baby Needs more libraries Namespaces No Yes Input validation No Yes Transmission time less more Verbosity less more Web services REST SOAP REST is more popular in non-critical applications SOAP is more reliable is business applications 5/23/2015 10
- 11. JSON vs. XML (Case Study) 5/23/2015 Comparison of JSON and XML Data Interchange Formats: A Case Study - Montana State University – Bozeman Scenario 1: 1 million objects. Scenario 2: 5 samples (20000, 40000, 60000, 80000, 100000) objects with statistical analysis. 11
- 12. JSON vs. XML (Case Study) 5/23/2015 12
- 13. Conclusion JSON is a light weight text format for data exchange. Simple BNF: objects, arrays, values (strings, numbers, null). JSON is much faster than XML in AJAX applications. REST + AJAX are the boosters of JSON. ADE should include JSON not only XML. 5/23/2015 13
Editor's Notes
- #2: lknvlsknv