I am having a json object as
area : CIRCLE (28.625360369528934 77.2227479486792, 3135.6)
how to parse it using WKTreader?
You need to go back to whoever wrote it out and explain the CIRCLE
is not a part of the WKT standard and they should stop producing it.
Your best bet then is to generate a polygon with a lot (200) sides that approximates the circle, probably using the JTS buffer method.
Point p = gFactory.createPoint(28.625360369528934 77.2227479486792);
Polygon circle = p.buffer( 3135.6 );