Which one is the best to use as data format jSon or xml?

jSon.

I think that it depends on the type of the application: JSON is lighter than XML and is easy to use in javascript but you have to know the structure of the serialized object so it's the best in web application when both client and server parts are developped by the same entity XML is heavier but is designed to be simply described and tronsformed(XSD, XSL) so it's the best for distributed applications (based for instance on SOAP services)

Personaly I prefer json because of simplicity and readability of json.
I'm sure that it depends of thestination of the application, but i think it's the best for web applications.

For Web Application , I Prefer JSON.

This depends on amount of data For simple and short data JSON is more prefered, But if you have more complexity or long chunks surely you need to use XML.

The current trend is to use JSON in data interchange (like in web services).
Some big vendors (like Twitter) deprecated their XML web services in favor to JSON.
XML is still used in configuration files, as it's -in my opinion- more readable than JSON.
Although systems like NodeJS (and its packages) use JSON in configuration files too.

JSON,

Because JSON is simple and more readable, it is easy to handle JSON data more than xml format. And JSON is fast enough than xml for small amount of data.

 

Also it depends upon the data you want touse.

If data is in the form of objects then JSON is preeferred But if the data is in the document/file form and big amount of data then we can use xml.

It totaly depends on the application you are dealing with, comlexity of the data and how light you need the data to be JSON is lighter but for complex data XMl might be a better choice as XML’s strength is extensibility and the avoidance of namespace clashes. It holds any data type and can be used to transport full documents with formatting information included. XML is best used when transporting something like a patient chart or text document with markup included.

JSON is purposefully limited and therefore much lighter than XML. I suspect that, most of the time, data can be modeled with hashes and lists comprising simple data types, making JSON the preferred route.

 

it depends if you are using java script sure json is the best choice if you are dealing with databases and web services for example asp.net xml is your optimum choice

JSON is better than XML.