XML vs. JSON - Size Comparison

I was wondering how compact is JSON comparing to XML. I grabbed an arbitrary XML from the web and convert it to an equivalent JSON format. It turns out that JSON is around two-third of the XML size.

XML: 596 bytes

JSON: 402 bytes

<?xml version="1.0"?> <message> <header> <to>companyReceiver</to> <from>companySender</from> <type>saveInvoice</type> </header> <info> <saveInvoice> <invoice date="01-20-2000" number="123"> <address country="US"> <name>John Smith</name> <street>123 George St.</street> <city>Mountain View</city> <state>CA</state> <zip>94041</zip> </address> <billTo country="US"> <name>Company A</name> <street>100 Main St.</street> <city>Washington</city> <state>DC</state> <zip>20015</zip> </billTo> <items> <item number="1"> <name>IBM A20 Laptop</name> <quantity>1</quantity> <USPrice>2000.00</USPrice> </item> </items> </invoice> </saveInvoice> </info> </message>

{ header:{ to:"companyReceiver", from:"companySender", type:"saveInvoice” }, info:{ saveInvoice:{ invoice:{date:"01-20-2000,number:"123", address:{country:"US", name:"John Smith", street:"123 George St.", city:"Mountain View", state:"CA", zip:"94041" }, billTo:{country="US", name:"Company A", street:"100 Main St.", city:"Washington", state:"DC", zip:"20015" }, items:[ { name:"IBM A20 Laptop", quantity:1, USPrice:2000.00 } ] } } } }