When to use RESTful Web Service, and when to use SOAP Web service? and Why?

REST can handle both XML and JSON. At present 90% projects using REST to communcate with server systems. By using we can transfer any media type also.

SOAP can only send XML. and REST is much easier to handle than SOAP

RESTFul Web Services serves JSON that is faster to parse than XML.

Soap can only return XML object but Rest can return multiple formats like JSON , XML , HTML and text etc.

Rest is faster then Soap.

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