aroben/index.html

## index.html
<!DOCTYPE html>
<html>
<head>
<style>
  body {
    font-family: monospace, "Segoe UI Emoji";
  }
</style>
</head>
<body>
<select id="switcher">
  <option value="">Show all characters</option>
  <option value="color">Show only color emoji</option>
  <option value="nocolor">Show only non-color emoji</option>
</select>
<table id="output"></table>
<script src="script.js"></script>
</body>
</html>

## script.js
var showColorEmoji = location.search !== "?nocolor";
var showNonEmoji = location.search !== "?color";

function log() {
  var table = document.getElementById("output");
  var row = table.insertRow(-1);
  [].slice.call(arguments).forEach(function (arg) {
    row.insertCell(-1).textContent = arg;
  });
}

function loaded(event) {
  var json = JSON.parse(event.target.responseText);

  var alternates = [];
  json.filter(function(emoji) {
    return emoji.emoji;
  }).forEach(function(emoji) {
    alternates = alternates.concat((emoji.unicodes || []).map(function(unicode) {
      return {emoji: unicode, description: emoji.description + " (alias)"};
    }));

    if (emoji.emoji.length === 1 && !isLeadingSurrogate(emoji.emoji.charCodeAt(0))) {
      alternates.push({emoji: emoji.emoji + String.fromCharCode(0xfe0e), description: emoji.description + " + variation selector-15"});
      alternates.push({emoji: emoji.emoji + String.fromCharCode(0xfe0f), description: emoji.description + " + variation selector-16"});
    } else if (emoji.emoji.charCodeAt(emoji.emoji.length - 1) === 0xfe0f) {
      var base = emoji.emoji.substr(0, emoji.emoji.length - 1);
      alternates.push({emoji: base, description: emoji.description});
      alternates.push({emoji: base + String.fromCharCode(0xfe0e), description: emoji.description + " + variation selector-15"});
      emoji.description = emoji.description + " + variation selector-16";
    }
    alternates.push(emoji);
  });

  var seen = {};
  alternates.filter(function(emoji) {
    var duplicate = emoji.emoji in seen;
    seen[emoji.emoji] = true;
    return !duplicate;
  }).sort(function(a, b) {
    var aPoints = codePoints(a.emoji);
    var bPoints = codePoints(b.emoji);
    return aPoints[0] - bPoints[0]
      || aPoints.length - bPoints.length
      || aPoints[1] - bPoints[1];
  }).forEach(function(emoji) {
    testEmoji(emoji.emoji, emoji.description);
  });
}

function testEmoji(emoji, description) {
  var points = codePoints(emoji).map(function(point) {
    return "U+" + codePointToHex(point).toUpperCase();
  }).join(" ");

  var color = isColorEmoji(emoji);
  if (showColorEmoji && color || showNonEmoji && !color)
    log(emoji, points, description);
}

function isColorEmoji(emoji) {
  return color(emoji, "#f00") === color(emoji, "#0f0");
}

var canvas = document.createElement("canvas");
function color(emoji, rgb) {
  var context = canvas.getContext("2d");
  context.clearRect(0, 0, 32, 32);
  context.fillStyle = rgb;
  context.textBaseline = "top";
  context.font = "32px Arial, 'Segoe UI Emoji'";
  context.fillText(emoji, 0, 0);
  var data = context.getImageData(0, 0, 32, 32).data;
  for (var i = 0; i < data.length; i += 4) {
    if (data[i] === 0 && data[i + 1] === 0 && data[i + 2] === 0) {
      continue;
    }
    return data[i].toString(16)
      + data[i + 1].toString(16)
      + data[i + 2].toString(16);
  }
  return "nothing";
}

function codePoints(utf16) {
  var points = [];

  var index = 0;
  while (index < utf16.length) {
    var unit = utf16.charCodeAt(index);

    if (!isLeadingSurrogate(unit)) {
      points.push(unit);
      index += 1;
      continue;
    }

    var leading = unit;
    var trailing = utf16.charCodeAt(index + 1);
    if (trailing < 0xdc00 || trailing > 0xdfff) {
      // Invalid surrogate pair
      return;
    }

    // Surrogate pair!
    points.push(0x10000 + ((leading - 0xd800) << 10) + (trailing - 0xdc00));
    index += 2;
  }

  return points;
}

function isLeadingSurrogate(codeUnit) {
  return codeUnit >= 0xd800 && codeUnit <= 0xdbff;
}

function codePointToHex(point) {
  var hex = point.toString(16);
  while (hex.length < 4) {
    hex = "0" + "" + hex;
  }
  return hex;
}

var switcher = document.getElementById("switcher");
switcher.value = location.search.substr(1);
switcher.addEventListener("change", function(event) {
  location.href = location.pathname + "?" + event.target.value;
});

var xhr = new XMLHttpRequest;
xhr.open("GET", "https://rawgit.com/github/gemoji/master/db/emoji.json");
xhr.onload = loaded;
xhr.send();
	<!DOCTYPE html>
	<html>
	<head>
	<style>
	body {
	font-family: monospace, "Segoe UI Emoji";
	}
	</style>
	</head>
	<body>
	<select id="switcher">
	<option value="">Show all characters</option>
	<option value="color">Show only color emoji</option>
	<option value="nocolor">Show only non-color emoji</option>
	</select>
	<table id="output"></table>
	<script src="script.js"></script>
	</body>
	</html>
	var showColorEmoji = location.search !== "?nocolor";
	var showNonEmoji = location.search !== "?color";

	function log() {
	var table = document.getElementById("output");
	var row = table.insertRow(-1);
	[].slice.call(arguments).forEach(function (arg) {
	row.insertCell(-1).textContent = arg;
	});
	}

	function loaded(event) {
	var json = JSON.parse(event.target.responseText);

	var alternates = [];
	json.filter(function(emoji) {
	return emoji.emoji;
	}).forEach(function(emoji) {
	alternates = alternates.concat((emoji.unicodes \|\| []).map(function(unicode) {
	return {emoji: unicode, description: emoji.description + " (alias)"};
	}));

	if (emoji.emoji.length === 1 && !isLeadingSurrogate(emoji.emoji.charCodeAt(0))) {
	alternates.push({emoji: emoji.emoji + String.fromCharCode(0xfe0e), description: emoji.description + " + variation selector-15"});
	alternates.push({emoji: emoji.emoji + String.fromCharCode(0xfe0f), description: emoji.description + " + variation selector-16"});
	} else if (emoji.emoji.charCodeAt(emoji.emoji.length - 1) === 0xfe0f) {
	var base = emoji.emoji.substr(0, emoji.emoji.length - 1);
	alternates.push({emoji: base, description: emoji.description});
	alternates.push({emoji: base + String.fromCharCode(0xfe0e), description: emoji.description + " + variation selector-15"});
	emoji.description = emoji.description + " + variation selector-16";
	}
	alternates.push(emoji);
	});

	var seen = {};
	alternates.filter(function(emoji) {
	var duplicate = emoji.emoji in seen;
	seen[emoji.emoji] = true;
	return !duplicate;
	}).sort(function(a, b) {
	var aPoints = codePoints(a.emoji);
	var bPoints = codePoints(b.emoji);
	return aPoints[0] - bPoints[0]
	\|\| aPoints.length - bPoints.length
	\|\| aPoints[1] - bPoints[1];
	}).forEach(function(emoji) {
	testEmoji(emoji.emoji, emoji.description);
	});
	}

	function testEmoji(emoji, description) {
	var points = codePoints(emoji).map(function(point) {
	return "U+" + codePointToHex(point).toUpperCase();
	}).join(" ");

	var color = isColorEmoji(emoji);
	if (showColorEmoji && color \|\| showNonEmoji && !color)
	log(emoji, points, description);
	}

	function isColorEmoji(emoji) {
	return color(emoji, "#f00") === color(emoji, "#0f0");
	}

	var canvas = document.createElement("canvas");
	function color(emoji, rgb) {
	var context = canvas.getContext("2d");
	context.clearRect(0, 0, 32, 32);
	context.fillStyle = rgb;
	context.textBaseline = "top";
	context.font = "32px Arial, 'Segoe UI Emoji'";
	context.fillText(emoji, 0, 0);
	var data = context.getImageData(0, 0, 32, 32).data;
	for (var i = 0; i < data.length; i += 4) {
	if (data[i] === 0 && data[i + 1] === 0 && data[i + 2] === 0) {
	continue;
	}
	return data[i].toString(16)
	+ data[i + 1].toString(16)
	+ data[i + 2].toString(16);
	}
	return "nothing";
	}

	function codePoints(utf16) {
	var points = [];

	var index = 0;
	while (index < utf16.length) {
	var unit = utf16.charCodeAt(index);

	if (!isLeadingSurrogate(unit)) {
	points.push(unit);
	index += 1;
	continue;
	}

	var leading = unit;
	var trailing = utf16.charCodeAt(index + 1);
	if (trailing < 0xdc00 \|\| trailing > 0xdfff) {
	// Invalid surrogate pair
	return;
	}

	// Surrogate pair!
	points.push(0x10000 + ((leading - 0xd800) << 10) + (trailing - 0xdc00));
	index += 2;
	}

	return points;
	}

	function isLeadingSurrogate(codeUnit) {
	return codeUnit >= 0xd800 && codeUnit <= 0xdbff;
	}

	function codePointToHex(point) {
	var hex = point.toString(16);
	while (hex.length < 4) {
	hex = "0" + "" + hex;
	}
	return hex;
	}

	var switcher = document.getElementById("switcher");
	switcher.value = location.search.substr(1);
	switcher.addEventListener("change", function(event) {
	location.href = location.pathname + "?" + event.target.value;
	});

	var xhr = new XMLHttpRequest;
	xhr.open("GET", "https://rawgit.com/github/gemoji/master/db/emoji.json");
	xhr.onload = loaded;
	xhr.send();