Short for JavaScript Object Notation, JSON is a lightweight data-interchange format
that is easy for humans to read and write, and for machines to parse and
generate. JSON is based on the object notation of the JavaScript language.
However, it does not require JavaScript to read or write because it is a text format
that is language independent. JSON notation contains these basic
elements:
Objects: Objects begin and end with curly braces ({}).
Object Members: Members consist of strings and values,
separated by colon (:). Members are separated by commas.
Arrays: Arrays begin and end with braces and contain
values. Values are separated by commas.
Values: A value can be a string, a number, an object, an array,
or the literals true, false or null.
Strings: Strings are surrounded by double quotes and contain
Unicode characters or common backslash escapes.
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JSON for Ajax Web services JSON is a subset to JavaScript, the de facto programming language used in all browsers. By structuring a data payload as a JSON response, you are effectively bypassing the need to parse an XML document in a browser — typically done via JavaScript of course — to get to the actual data.
Speeding Up AJAX with JSON The XMLHttpRequest object analyzes the MIME type of the data coming back from the Web server by looking at the Content-type header that precedes the data.
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