Either json or Soap to exchange data in my project?
Use JSON for data serialization.  It's clean, simple, compact, widely supported, and understands data types.  Use SOAP only if you like pain.  It is a bloated sack of cruft built upon another bloated sack of cruft.
I am doing a car rental software, in which a front end back end are there, where the back end will do the accounting part. I have to send some data like customer name, amount, currency etc. to account engine to prepare the ledgers. I am confused whether to use json or soap for information exchange between front and back ends. ur suggestions are precious. thank u..