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Json

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  • 1. JSON (JavaScript Object Notation) 1
  • 2. What is JSON? Light weight data-interchange format. Subset of JavaScript. Language independent. Text based. Easy to parse . 2
  • 3. Why JSON?JSON is recognized natively by JavaScript. No need for parsing anXML document to extract the data. 3
  • 4. JSON is Not… JSON is not a document format. JSON is not a markup language. 4
  • 5. Properties of JSON Human and machine readable format. No support for Unicode. Self-documenting format that describes structure and field names. Strict syntax and parsing requirements. Represents the most general computer science data structures likerecords, lists and trees. 5
  • 6. Where can JSON be used? Can be used for transferring medium amounts of data. Used in Java Script and then rendered on HTML pages. AJAX has many applications for JSON. Use JSON for applications that are browser based. 6
  • 7. JSON Data Types Strings -Control Characters Number-Integer, Real and Floating Boolean-True and False Null 7
  • 8. JSON Data Types (Cont…)StringStrings must be delimited by the double quote characters.Example: ”Address”, "444 Colombia"BooleanIn JSON “True" and “False" are pre-defined keywords.Example: “Active":True 8
  • 9. Data types (Cont…)NumberJSON includes positive integers and Negative integers.Example: “Total points” -123NullNull string, also known as an empty string, is a string of zero length.Example: “Email":null 9
  • 10. Simple Example of a JSON File{ "menu": "File", "commands": [ { "title": "New“, "action":"CreateDoc” }, { "title": "Open", "action": "OpenDoc” }, { "title": "Close“, "action": "CloseDoc” } ] } 10
  • 11. JSON ObjectJSON Object Notation JSON object is an unordered set of name/value pairs and orderedlist of values. Object begins with { (left brace) and ends with } (right brace). Each name is followed by (colon). Name/value pairs are separated by , (comma). 11
  • 12. JSON Representation of an Object Var HomeAddress = { "Address" : “Srini", "City" : “Bangalore", "PostalCode" : 580006 }; 12
  • 13. JSON Functions JSON_decode — Decodes a JSON string. JSON_encode — Returns the JSON representation of a value. JSON_last_error — Returns the last error occurred. 13
  • 14. JSON DecodeDecode parses the strings as a JSON-syntax string and returns thegeneric JSON object representation.json_decode()mixed json_decode ( string $json , bool $assoc) Takes a JSON encoded string and converts it into a PHP value.$json The JSON string being decoded$assoc False ----Return the value as an object True ----Return the value as an associative array 14
  • 15. JSON Decode Example<?php$json = {"foo-bar": 12345};$obj = json_decode($json);print $obj->{foo-bar}; // 12345?> 15
  • 16. JSON EncodeJSON encode returns the JSON representation of a value.string json_encode ( mixed $value )Returns a string containing the JSON representation of $value.$value Value being encoded, Can be any type except a resource. Function only works with UTF-8 encoded data. 16
  • 17. JSON Encode Example<?php$arr = array (a=>1,b=>2,c=>3,d=>4,e=>5);echo json_encode($arr);// Output {"a":1,"b":2,"c":3,"d":4,"e":5}$arr = array ( 1, 2, 3, 4, 5 );echo json_encode($arr);// Output [1,2,3,4,5]$arr[x] = 10;echo json_encode($arr);// Output {"0":1,"1":2,"2":3,"3":4,"4":5,"x":10}echo json_encode(54321);// Output 54321?> 17
  • 18. JSON in JavaScriptJavaScript Object Notation is a lightweight data-interchangeformat that is completely language independent text formatwhich is fast and easy to understand. 18
  • 19. Example - JSON in JavaScript<html><head><title> Object creation in JSON in JavaScript</title><script language="javascript" >var JSONObject ={"name" : "Amit“,“address" : "Bangalore“,"age" : 23,"phone" : "4565763",“MobileNo" : 981100092}; 19
  • 20. Example - JSON in JavaScript (Cont…)document.write("<h2><font color=skyblue>Name</font>::“+JSONObject.name+"</h2>");document.write("<h2><font color=skyblue>Address</font>::“+JSONObject.address+"</h2>");document.write("<h2><font color=skyblue>Age</font>::“+JSONObject.age+"</h2>");document.write("<h2><font color=skyblue>Phone No.</font>::“+JSONObject.phone+"</h2>");document.write("<h2><font color=skyblue>Mobile No.</font>::“+JSONObject.MobileNo+"</h2>");</script></head><body bgcolor="#cc4488"><h3>Example of object creation in JSON in JavaScript</h3></body></html> 20
  • 21. AJAX with JSONBoth XML and JSON use structured approaches to mark up data. More and more web services are supporting JSON.ExampleYahoos various search services, travel planners, and highwaytraffic services. 21
  • 22. Why JSON is Better than Ajax?JSON is widely used in AJAX. The X in AJAX stands for XML.Example{"fullname": "Swati Kumar“, "org": "Columbia",}<?xml version=1.0‘ encoding=UTF-8?><element><fullname>Swati Kumar</fullname><org>Columbia</org></element> 22
  • 23. JSON and XMLBenefits of JSON The easiness of readingThe easiness of usingBenefits of XMLXML is extensible.Widely used and recognized by almost all programming languages.Unfortunally, both XML and JSON are enable to integrate a largeamount of data in binary form. 23
  • 24. Example{ "firstName": “Sahana", "lastName": "Saniya", "age": 25, "address": { "streetAddress": “2nd Street", "city": “Bangalore", "state": “India", }, "phoneNumber": [ { "type": "home", "number": “234243" }, { "type": "fax", "number": “645654" } ], "newSubscription": false, "companyName": null } 24
  • 25. Equivalent for the above in XML could be<Person><firstName>John</firstName><lastName>Smith</lastName><age>25</age><address><streetAddress>21 2nd Street</streetAddress><city>New York</city><state>NY</state><postalCode>10021</postalCode></address><phoneNumber type="home">212 555-1234</phoneNumber><phoneNumber type="fax">646 555-4567</phoneNumber><newSubscription>false</newSubscription><companyName /></Person> 25
  • 26. JSON is Like XML because… Both are self-describing and thus human readable. Both are hierarchical (i.e. we can have values within values.) Both can be parsed and used by lots of programming languages. Both can be passed around using AJAX (i.e. httpWebRequest). 26
  • 27. JSON Vs XML JSON stands for JavaScript Object Notation, Considered as thesubset of JavaScript. XML on the other hand is a mark-up language that could be used indifferent languages. Parsing JSON encoded data is much faster than parsing XMLencoded data. 27
  • 28. JSON Vs XML (Cont…)XML<result><people><person firstName=“Aman" lastName=“Valya"/><person firstName=“Suman" lastName=“Valya"/>...</people></result>JSON{people:[{ firstName: ‘Aman, lastName, ‘Valya },{ firstName: ‘Suman, lastName, ‘Valya },... 28
  • 29. Why Use JSON Over XML? Lighter and faster than XML as on-the-wire data. JSON objects are typed while XML data is type less. JSON types are string, number, array, Boolean. XML data are all string. Data is readily accessible as JSON objects in your JavaScript Code. XML data needed to be parsed and assigned to variables throughtedious DOM APIs. 29
  • 30. Features of JSON Provides multiple functionalities such as encode, decode/parse. Flexible, simple and easy to use. Supports streaming output of JSON text. Heap based parser. High performance. No dependency on external libraries. 30
  • 31. JSON Data Interchange JSON is a simple, common representation of data. Communication between servers and browser clients. Communication between peers. Language independent data interchange. 31
  • 32. Thank you 32