https://github.com/nodejs/Release/blob/master/schedule.json を用途別に使いやすく整形するスクリプト

nodejs-schedule.sh

curl -sL https://raw.githubusercontent.com/nodejs/Release/master/schedule.json | jq --arg today "$(date -u +%Y-%m-%d)" '
. as $a | keys | map({release:.}+$a[.]) | sort_by(.start) | reverse |
{
  pending: map(select(.start>$today)),
  current: map(select(.start<=$today and .lts==null))[0:1],
  active_lts: map(select(.lts and .lts<=$today and .maintenance>$today)),
  maintenance_lts: map(select(.lts and .lts<=$today and .maintenance<=$today and .end>$today)),
  end: map(select(.end<=$today))
}'

output-20190301.json

{
  "pending": [
    {
      "release": "v12",
      "start": "2019-04-23",
      "lts": "2019-10-22",
      "maintenance": "2021-04-01",
      "end": "2022-04-01",
      "codename": ""
    }
  ],
  "current": [
    {
      "release": "v11",
      "start": "2018-10-23",
      "maintenance": "2019-04-01",
      "end": "2019-06-30"
    }
  ],
  "active_lts": [
    {
      "release": "v10",
      "start": "2018-04-24",
      "lts": "2018-10-30",
      "maintenance": "2020-04-01",
      "end": "2021-04-01",
      "codename": "Dubnium"
    }
  ],
  "maintenance_lts": [
    {
      "release": "v8",
      "start": "2017-05-30",
      "lts": "2017-10-31",
      "maintenance": "2019-01-01",
      "end": "2019-12-31",
      "codename": "Carbon"
    },
    {
      "release": "v6",
      "start": "2016-04-26",
      "lts": "2016-10-18",
      "maintenance": "2018-04-30",
      "end": "2019-04-01",
      "codename": "Boron"
    }
  ],
  "end": [
    {
      "release": "v9",
      "start": "2017-10-01",
      "maintenance": "2018-04-01",
      "end": "2018-06-30"
    },
    {
      "release": "v7",
      "start": "2016-10-25",
      "maintenance": "2017-04-30",
      "end": "2017-06-30"
    },
    {
      "release": "v5",
      "start": "2015-10-29",
      "maintenance": "2016-04-30",
      "end": "2016-06-30"
    },
    {
      "release": "v4",
      "start": "2015-09-08",
      "lts": "2015-10-12",
      "maintenance": "2017-04-01",
      "end": "2018-04-30",
      "codename": "Argon"
    },
    {
      "release": "v0.12",
      "start": "2015-02-06",
      "end": "2016-12-31"
    },
    {
      "release": "v0.10",
      "start": "2013-03-11",
      "end": "2016-10-31"
    }
  ]
}