JSONIDU0075 Sissejuhatus veebiteenustesse

JSON stands for JavaScript Object Notation JSON is lightweight text-data interchange

format JSON is language independent  JSON is "self-describing" and easy to

understand

What is JSON?

JSON is plain text JSON is "self-describing" (human readable) JSON is hierarchical (values within values) JSON can be parsed by JavaScript JSON data can be transported using AJAX

Much Like XML

No end tag Shorter Quicker to read and write Can be parsed using built-in JavaScript eval() Uses arrays No reserved words

Much Unlike XML

Data is in name/value pairs Data is separated by comma Curly brackets holds objects Square brackets holds arrays

{ "firstName":"John" , "lastName":"Doe" }

JSON Syntax Rules

{"employees": [{ "firstName":"John" , "lastName":"Doe" }, { "firstName":"Anna" , "lastName":"Smith" }, { "firstName":"Peter" , "lastName":"Jones" }]}

JSON Syntax Rules

{"firstName": „Peeter", "lastName": „Porgand", "address": {

"streetAddress": „Ehitajate tee 5-III 301", "city": „Tallinn", "postalCode": „123456“

}, "phoneNumbers": [ "812 123-1234", "916 123-4567" ] }

JSON example

<person> <firstName>Peeter</firstName>

<lastName>Porgand</lastName> <address>

<streetAddress>Ehitajate tee</streetAddress> <city>Tallinn</city>

<postalCode>123455</postalCode> </address> <phoneNumbers>

<phoneNumber>812 123-1234</phoneNumber> <phoneNumber>916 123-4567</phoneNumber> </phoneNumbers> </person>

Same in XML

http://www.w3schools.com/json/tryit.asp?filename=tryjson_eval

JSON to JavaScript

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