e.g.
$ curl -s https://japan-d2.github.io/postalcode/001/0000.json | jq
[
{
"postalCode": "0010000",
"prefKana": "ホッカイドウ",
"address1Kana": "サッポロシキタク",
"address2Kana": "",
"pref": "北海道",
"address1": "札幌市北区",
"address2": ""
}
]