Is it possible to use a body in a GET request, for example, to send JSON?

According to the HTTP standard, GET requests should not contain a body. Although some clients and servers may technically support a body in GET, this is not correct and can lead to unpredictable behavior.

If you need to send data to the server, it is better to use POST, PUT, or other methods designed for transmitting a request body.

Parameters in GET are usually passed via the query string, for example:

GET /api/resource?param1=value1&param2=value2 HTTP/1.1

Sending JSON in the body of a GET request is not recommended and is not supported by most servers and libraries.