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<An Introduction to JavaScript Object Notation (JSON) in JavaScript and .NET ⁄ >




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When designing an application that will communicate with a remote computer, a data format and exchange protocol must be selected. There are a variety of open, standardized options, and the ideal choice depends on the applications requirements and pre-existing functionality. For example, SOAP-based web services format the data in an XML payload wrapped within a SOAP envelope.

While XML works well for many application scenarios, it has some drawbacks that make it less than ideal for others. One such space where XML is often less than ideal is with Ajax-style web applications. Ajax is a technique used for building interactive web applications that provide a snappier user experience through the use of out-of-band, lightweight calls to the web server in lieu of full-page postbacks. These asynchronous calls are initiated on the client using JavaScript and involve formatting data, sending it to a web server, and parsing and working with the returned data. While most browsers can construct, send, and parse XML, JavaScript Object Notation (or JSON) provides a standardized data exchange format that is better-suited for Ajax-style web applications.



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