Supported interfaces

doc
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There’s GET /v2/connections in the Snapd REST API (basically the same as snap connections --all):

$ sudo curl -sS --unix-socket /run/snapd.socket http://localhost/v2/connections\?all \         ✔  11:30:02  
| jq
{
  "type": "sync",
  "status-code": 200,
  "status": "OK",
  "result": {
    "established": [
      {
        "slot": {
          "snap": "snapd",
          "slot": "audio-playback"
        },
        "plug": {
          "snap": "ardour",
          "plug": "audio-playback"
        },
        "interface": "audio-playback"
[...]