$ npm install -g @spaceduckapp/readability-cli

$ readability-cli path/to/input.html --out path/to/output.json

$ cat path/to/input.html | readability-cli - > path/to/output.json

$ curl --silent 'https://example.com/' | readability-cli - --sanitize | jq
{
  "title": "Example Domain",
  "byline": null,
  "dir": null,
  "lang": null,
  "content": "<div id=\"readability-page-1\" class=\"page\"><div>\n    \n    <p>This domain is for use in illustrative examples in documents. You may use this\n    domain in literature without prior coordination or asking for permission.</p>\n    <p><a href=\"https://www.iana.org/domains/example\">More information...</a></p>\n</div></div>",
  "textContent": "\n    \n    This domain is for use in illustrative examples in documents. You may use this\n    domain in literature without prior coordination or asking for permission.\n    More information...\n",
  "length": 191,
  "excerpt": "This domain is for use in illustrative examples in documents. You may use this\n    domain in literature without prior coordination or asking for permission.",
  "siteName": null,
  "publishedTime": null
}