Simple Clipboard Viewer in macOS

getPasteboardItemsAsString.js

/*
 * Simple Clipboard Viewer in macOS
 * Run with Script Editor
 */
 
ObjC.import('AppKit')

function getPasteboardItemsAsString () {
  const items = $.NSPasteboard.generalPasteboard.pasteboardItems

  return [...Array(items.count).keys()].map(i => {
    const item = items.objectAtIndex(i)
    const types = ObjC.deepUnwrap(item.types)
    const result = {}

    types.forEach(type => {
      result[type] = item.stringForType(type).js
    })
	
	return result
  })
}

console.log(JSON.stringify(getPasteboardItemsAsString(), null, '\t'))
/*
[
	{
		"public.html": "<meta charset='utf-8'><h1 style=\"color: rgb(0, 0, 0); font-family: &quot;Apple SD Gothic Neo&quot;; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial;\">Hello, world!</h1>",
		"public.utf8-plain-text": "Hello, world!"
	}
]
*/