Official website has a relatively complete and detailed introduction, so it is very convenient to do relevant tests.

Sample output of API URI response type (IPv4)

Https://api.ipify.org text 98.207.254. 136

https://api.ipify.org？ format = JSON JSON { " IP ":" 98 . 207 . 254 . 136 " }

https://api.ipify.org？ Format=jsonp jsonp callback ({"IP": "98.207.254.136"});

https://api.ipify.org？ Format = jsonp & callback = getip jsonp getip ({"IP": "98.207.254.136"});