cURL is a command line tool for getting or sending files using URL syntax. cURL is also using the same range of common internal protocol that libcurl does because cURL uses the libcurl for file transfer.
JSON API is a full specification for the request by a client to fetch or to modify data and how the server should respond to that client requests. Without compromising on readability, and flexibility, the number of request for the data and the amount of data transmitted between clients and servers will be handled by JSON API.
So using different APIs integration website can extensible to run it very smooth with the third party software or tool. JSON, cURL, and many more are there which can be utilized for one and other aspects of the website to display, to post or to get the information either from the third party or from the server side.
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