JSON The x in Ajax Douglas Crockford Yahoo! Inc. YAHOO IS HIRING DEVELOPERS Ajax, PHP, DHTML/XHTML, Javascript, CSS, Actionscript / Flash Josie Aguada [email protected] Data Interchange • The key idea in Ajax. • An alternative to page replacement. • Applications delivered as pages. • How should the data be delivered? History of Data Formats • Ad Hoc • Database Model • Document Model • Programming Language Model JSON • JavaScript Object Notation • Minimal • Textual • Subset of JavaScript JSON • A Subset of ECMA-262 Third Edition. • Language Independent. • Text-based. • Light-weight. • Easy to parse. JSON Is Not... • JSON is not a document format. • JSON is not a markup language. • JSON is not a general serialization format. No cyclical/recurring structures. No invisible structures. No functions. History • 1999 ECMAScript Third Edition • 2001 State Software, Inc. • 2002 JSON.org • 2005 Ajax • 2006 RRRRFFFFCCCC 4627 Languages • Chinese • English • French • German • Italian • Japanese • Korean Languages • ActionScript • Perl • C / C++ • Objective-C • C# • Objective CAML • Cold Fusion • PHP • Delphi • Python • E • Rebol • Erlang • Ruby • Java • Scheme • Lisp • Squeak