Temporary solution for `mas list --json`. ref. Add option for retrieving information in JSON format · Issue #190 · mas-cli/mas - https://github.com/mas-cli/mas/issues/190

output.jsonl

{"id": 497799835, "name": "Xcode (13.1)"}
{"id": 1423210932, "name": "Flow (2.7.5)"}
{"id": 1452453066, "name": "Hidden Bar (1.8)"}
{"id": 1475387142, "name": "Tailscale (1.16.1)"}

print-mas-list.fish

for i in (mas list)
    echo $i | python -c "import re; print(re.sub(r'(\d+)\s+(.+?)\s+(\(.+\))', r'{\"id\": \1, \"name\": \"\2 \3\"}', input()))"
end