Every post starts with some kind of protocol ("vmess" or "trojan") and the rest is a bas64 encoded string. When you decode it, you get the following json string(just one example):

{"add":"46.101.157.247","aid":"0","alpn":"","fp":"","host":"","id":"a0958ff9-d80e-470c-be92-3f27ddc0f1a1","net":"tcp","path":"/","port":"8880","ps":"Channel id: @ShadowProxy66🇩🇪","scy":"auto","sni":"","tls":"","type":"http","v":"2"}