JAVASCRIPT

JSON vs XML

//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>

xml vs json

These are 2 common formats that we use when exchanging data across the web: 

-- eXtensible Markup Language (XML) has been in use for a very long time and is 
best suited for exchanging document-style data
-- when programs just want to exchange dictionaries, lists, or other internal 
information with each other, they use JavaScript Object Notation (JSON)