When to prefer JSON over XML?

Question

My requirement is just to display a set of values retrieved from database on a spread. I am using jquery.

Answer 1

from JSON - the last feet

When you go down the JSON route, you run into the same issues that XML faced 10 years ago:

Mixing data from two different sources into one JSON packet can cause element labels to bump into each other. Mix up a packing slip and an invoice, and suddenly the From address may mean something quite different. That’s why XML has namespaces.

Converting between different JSON structures would require writing mundane code. A more declarative way to map data would make the job easier. That’s why XML has XSLT.

Describing a JSON packet’s structure—its fields, data types, etc.—is necessary in order for people to hook into your services. It’s essential to have a metadata language for this. That’s why XML has Schemas.

Carrying on two simultaneous client-server conversations takes care. If you ask the server two questions and get one answer back, how do you know what question it answers? That’s why XML has WS-Correlation.