I have read that iPad supports .epub format. So are there any API's which makes it easy to read and display .epub format files?
Thanks
epub is simply a zipped up collection of xhtml files and metadata (indicies, publisher, author details etc) Epub specs
So all you need to do is unzip the file (can be done by renaming to a .zip extension) and then read the XHTML files in a browser. There will be a .opf file that lists all the files that are in the zip
This assumes that the epub file is not DRM protected if so then you cannot read it except through the program that the DRM is specified to use (usually Adobe Digital Editions on a computer - or iBooks on an iPad) Breaking this encryption is not allowed by DCMA or other laws in many countries.