JSON
vs XML
Both JSON
and XML can be used to receive data from a web server.
The
following JSON and XML examples both defines an employees object, with an array
of 3 employees:
JSON
Example
{"employees":[
{ "firstName":"John",
"lastName":"Doe" },
{ "firstName":"Anna",
"lastName":"Smith" },
{ "firstName":"Peter",
"lastName":"Jones" }
]}
XML
Example
<employees>
<employee>
<firstName>John</firstName>
<lastName>Doe</lastName>
</employee>
<employee>
<firstName>Anna</firstName>
<lastName>Smith</lastName>
</employee>
<employee>
<firstName>Peter</firstName>
<lastName>Jones</lastName>
</employee>
</employees>
JSON is Like XML Because
Both JSON
and XML are "self describing" (human readable)
Both JSON and
XML are hierarchical (values within values)
Both JSON
and XML can be parsed and used by lots of programming languages
Both JSON
and XML can be fetched with an XMLHttpRequest
JSON is
Unlike XML Because
JSON doesn't
use end tag
JSON is
shorter
JSON is quicker
to read and write
JSON can use
arrays
The biggest
difference is:
XML has to be parsed with an XML parser. JSON
can be parsed by a standard JavaScript function.
Why JSON is
Better Than XML
XML is much
more difficult to parse than JSON.
JSON is parsed
into a ready-to-use JavaScript object.
For AJAX
applications, JSON is faster and easier than XML:
Using XML
Fetch an XML
document
Use the XML
DOM to loop through the document
Extract
values and store in variables
Using JSON
Fetch a JSON
string
JSON.Parse
the JSON string
0 comments: