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JavaScript

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HTML

              
                <!-- app -->
<main class="app">
	
	<!-- header -->
	<header class="header">
		<!-- left -->
		<div class="left">
			<a href="#" id="run">
				<svg width="1em" height="1em" viewBox="0 0 16 16" class="bi bi-play" fill="currentColor" xmlns="http://www.w3.org/2000/svg">
					<path fill-rule="evenodd" d="M10.804 8L5 4.633v6.734L10.804 8zm.792-.696a.802.802 0 0 1 0 1.392l-6.363 3.692C4.713 12.69 4 12.345 4 11.692V4.308c0-.653.713-.998 1.233-.696l6.363 3.692z" />
				</svg>
			</a>
			<a href="#" id="clear">
				<svg width="1em" height="1em" viewBox="0 0 16 16" class="bi bi-trash2-fill" fill="currentColor" xmlns="http://www.w3.org/2000/svg">
					<path d="M2.037 3.225l1.684 10.104A2 2 0 0 0 5.694 15h4.612a2 2 0 0 0 1.973-1.671l1.684-10.104C13.627 4.224 11.085 5 8 5c-3.086 0-5.627-.776-5.963-1.775z" />
					<path fill-rule="evenodd" d="M12.9 3c-.18-.14-.497-.307-.974-.466C10.967 2.214 9.58 2 8 2s-2.968.215-3.926.534c-.477.16-.795.327-.975.466.18.14.498.307.975.466C5.032 3.786 6.42 4 8 4s2.967-.215 3.926-.534c.477-.16.795-.327.975-.466zM8 5c3.314 0 6-.895 6-2s-2.686-2-6-2-6 .895-6 2 2.686 2 6 2z" />
				</svg>
			</a>
			<a href="#" id="top">
				<svg width="1em" height="1em" viewBox="0 0 16 16" class="bi bi-check-square" fill="currentColor" xmlns="http://www.w3.org/2000/svg">
					<path fill-rule="evenodd" d="M14 1H2a1 1 0 0 0-1 1v12a1 1 0 0 0 1 1h12a1 1 0 0 0 1-1V2a1 1 0 0 0-1-1zM2 0a2 2 0 0 0-2 2v12a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V2a2 2 0 0 0-2-2H2z" />
					<path fill-rule="evenodd" d="M10.97 4.97a.75.75 0 0 1 1.071 1.05l-3.992 4.99a.75.75 0 0 1-1.08.02L4.324 8.384a.75.75 0 1 1 1.06-1.06l2.094 2.093 3.473-4.425a.236.236 0 0 1 .02-.022z" />
				</svg>
			</a>
		</div>
		<!-- / left -->
		<!-- center -->
		<div id="info" class="center"></div>
		<!-- / center -->
		<!-- right -->
		<div class="right"></div>
		<!-- / right -->
	</header>
	<!-- / header -->
	
	<!-- content -->
	<section class="content">
		<!-- editor -->
		<div id="editor" spellcheck="false"></div>
		<!-- / editor -->
		<!-- log -->
		<div id="log"></div>
		<!-- / log -->
	</section>
	<!-- / content -->
	
</main>
              
            
!

CSS

              
                $background: #3f51b5;
$color: #e8ebff;
$string: #00c4ff;
$number: #f44336;
$boolean: #8bc34a;
$object: #ffc107;
$undefined: #e91e63;

%equal-heights {
	flex-wrap: wrap;
	float: left;
	height: 100%;
	width: calc(100% / 2);
}

%fonts {
	font-size: 12px;
	font-weight: normal;
	font-family: "Consolas", monospace;
	line-height: 1.3;
	letter-spacing: 1.4px;
}

%scrollbar {
	overflow-y: auto;

	&::-webkit-scrollbar {
		width: 10px;
		background: darken($background, 20%);
	}

	&::-webkit-scrollbar-corner {
		background: darken($background, 20%);
	}

	&::-webkit-scrollbar-thumb {
		background: darken($background, 10%);
	}
}

/** Base typography
-------------------- */
*,
*:before,
*:after {
	box-sizing: inherit;
}

html {
	-ms-text-size-adjust: 100%;
	-webkit-text-size-adjust: 100%;
}

* {
	box-sizing: border-box;
}

html {
	box-sizing: border-box;
	font-size: 85%;
	font-family: serif;
}

html,
body {
	height: 100%;
	position: relative;
}

/** body
-------------------- */
body {
	margin: 0;
	padding: 0;
	font-size: 100%;
	font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
		Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif,
		"Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
	font-size: 14px;
	font-style: normal;
	font-weight: 400;
	line-height: 14px;
}

/** App
--------------------------*/
body {
	overflow: hidden;
	background: darken($background, 30%);
}

.app {
	padding: 0;
	height: 100%;
	position: relative;
	overflow: hidden;
	background: darken($background, 40%);
	box-shadow: 0px 3px 3px darken($background, 40%);
	border-radius: 4px;
	border: 2px solid darken($background, 20%);

	max-width: 760px;
	max-height: 480px;
	margin: 3rem auto;

	@media (max-width: 760px) {
		box-shadow: none;
		border-radius: 0;
		border: none;

		max-width: 100%;
		max-height: 100%;
		margin: 0;
	}
}
.header {
	height: 2.6rem;
	background: darken($background, 20%);
	overflow: hidden;
	font-size: 14px;
	font-weight: 700;
	user-select: none;

	.left {
		float: left;
		width: 7rem;
	}

	.right {
		float: right;
		width: 7em;
		text-align: right;
	}

	.center {
		width: calc(100% - 20rem);
		height: 2.6rem;
		display: block;
		padding: 0.2em;
		float: left;
		span {
			display: block;
			text-align: center;
			margin: 0.4rem;
			text-transform: capitalize;
			color: $boolean;
			animation: fade 1s 1 ease;
			@keyframes fade {
				from {
					opacity: 0;
				}
			}
		}
	}

	a {
		display: inline-block;
		text-decoration: none;
		transition: background 500ms ease;
		margin: 0.2rem 0;
		padding: 0.5rem 1rem;
		color: $color;
		&:first-child {
			margin-left: 0.2rem;
		}
		svg {
			stroke: darken($color, 10%);
			stroke-width: 1px;
		}
		&:hover,
		&:focus {
			transition: background 500ms ease;
			background: darken($background, 12%);
		}
	}
}
.content {
	display: flex;
	overflow: hidden;
	height: calc(100% - 2.6rem);

	#log {
		margin: 0;
		@extend %equal-heights;
		word-break: break-word;
		white-space: pre-wrap;
		@extend %fonts;
		@extend %scrollbar;
		padding: 0.5rem;
		background: darken($background, 35%);
		color: $color;
		
		a{
			color: darken($color,10%);
		}

		.log-string {
			color: $string;
		}

		.log-number {
			color: $number;
		}

		.log-boolean {
			color: $boolean;
		}

		.log-object {
			color: $object;
		}

		.log-undefined {
			color: $undefined;
			font-weight: bold;
		}
	}

	#editor {
		@extend %equal-heights;
		resize: none;
		border: none;
		outline: none;
		white-space: pre-wrap;
		padding: 0;
		transition: background 500ms ease;
		background: darken($background, 30%);
		color: $color;

		.CodeMirror {
			line-height: 1.5;
			width: 100%;
			height: 100%;
			font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
				Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif,
				"Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
			font-weight: bolder;
			font-size: 13px;
			letter-spacing: 1.5px;
			transition: background 500ms ease;
			background: darken($background, 30%);
			color: $color;
			.CodeMirror-linenumber {
				color: white;
			}
			.CodeMirror-cursor {
				border-left: 1px solid white;
			}
			.CodeMirror-scroll,
			.CodeMirror-vscrollbar,
			.CodeMirror-hscrollbar {
				@extend %scrollbar;
			}
		}
		.cm-s-material-palenight {
			background: darken($background, 30%);
			color: $color;
			height: 100%;

			.CodeMirror-gutter {
				background: #171e44;
				border-right: 1px solid #111631;
				user-select: none;
			}

			&:hover,
			&:focus {
				transition: background 500ms ease;
				outline: none;
				background: darken($background, 32%);
			}
		}
	}
}
.clearing {
	animation: clear 800ms ease;
}
@keyframes clear {
	from {
		background: white;
	}
}
.gutter {
	background-color: darken($background, 36%);
	background-repeat: no-repeat;
	background-position: 50%;
	cursor: e-resize;
	.gutter-vertical {
		background-image: url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAB4AAAAFAQMAAABo7865AAAABlBMVEVHcEzMzMzyAv2sAAAAAXRSTlMAQObYZgAAABBJREFUeF5jOAMEEAIEEFwAn3kMwcB6I2AAAAAASUVORK5CYII=");
	}

	.gutter-horizontal {
		background-image: url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAUAAAAeCAYAAADkftS9AAAAIklEQVQoU2M4c+bMfxAGAgYYmwGrIIiDjrELjpo5aiZeMwF+yNnOs5KSvgAAAABJRU5ErkJggg==");
	}
}

              
            
!

JS

              
                const _ = (el) => document.querySelector(el);
/**
 * Storage theme settings
 *
 * set Storage.val = {color: 'blue'}
 * get Storage.val
 */
const Storage = {
	get val() {
		this.data = window.localStorage.getItem("last-saved");
		return this.data;
	},
	set val(value) {
		this.data = value;
		window.localStorage.setItem("last-saved", this.data);
	}
};

/**
 * Replace Console log
 */
const log = console.log;
console.log = function () {
  let val = [].slice.call(arguments).reduce(function(prev, arg) {
    let output = (typeof arg === "object" ? JSON.stringify(arg) : arg);
    if(typeof arg === "object" && typeof JSON === "object") output = `<span class="log-object">${JSON.stringify(arg)}</span>\n`;
    else if(typeof arg === "function" && typeof JSON.stringify === "function") output = `<span class="log-function">${JSON.stringify(arg)}</span>\n`;
    else output = `<span class="log-${(typeof arg)}">${arg}</span>\n`;
    return (prev+' '+output);
  }, '');
  logger.innerHTML += val;
  log(...arguments)
}

// print info cose
const info = `--------------------------------
- Console test [Version 0.0.2] -
- Made with ♥ by @Nakome.      -
--------------------------------`;

const editor = document.getElementById("editor");
const logger = document.getElementById("log");
const clear = document.getElementById("clear");
const run = document.getElementById("run");
const infoDiv = document.getElementById("info");

let codeEditor = CodeMirror(editor, {
	mode: {
		name: "javascript",
		json: true
	},
	lineNumbers: true,
	theme: "material-palenight"
});

// first code
let initValue = (Storage.val) ? Storage.val : "let ready = 'Ready'\nready";
codeEditor.setValue(initValue);

// divide 
Split(["#editor", "#log"], {
	elementStyle: (dimension, size, gutterSize) => ({
		"flex-basis": `calc(${size}% - ${gutterSize}px)`
	}),
	gutterStyle: (dimension, gutterSize) => ({
		"flex-basis": `${gutterSize}px`
	}),
	minSize: [200, 200]
});

window.addEventListener("error", errorInfo);
logger.textContent = info + "\n";
clear.addEventListener("click", clearLog);
run.addEventListener("click", runEval);
notification("Ready");


/**
 * Error info
 * @param {string} e
 */
function errorInfo(e) {
	let msg = "EXCEPTION: ";
	msg += e.message + "\n";
	msg += e.filename;
	msg += e.lineno + ":" + e.colno;
	logger.innerHTML += `<div style="margin: 10px 0; display:block; background: #f55; color: white; padding: 4px 10px; border-radius: 4px; font-family: 'Lucida Console', Monaco, monospace, sans-serif; font-size: 80%"><b style="color:#FFEB3B;">Error</b>: ${msg}</div>`;
}
/**
 * Clear log
 * @param {object} evt
 */
function clearLog(evt) {
	evt.preventDefault();
	notification("Clear log");
	logger.textContent = info + "\n";
	logger.className = "clearing";
	let w = setTimeout(() => {
		logger.className = "";
		clearTimeout(w);
	}, 800);
}
/**
 * Parse code and check type
 * @param {string} str
 */
function parseCode(str) {
	let code = eval(str);
	let output = typeof code === "object" ? JSON.stringify(code) : code;
	if (typeof code === "object" && typeof JSON === "object")
		output = `<span class="log-object">${JSON.stringify(code)}</span>\n`;
	else if (typeof code === "function" && typeof JSON.stringify === "function")
		output = `<span class="log-function">${JSON.stringify(code)}</span>\n`;
	else output = `<span class="log-${typeof code}">${code}</span>\n`;
	return output;
}
/**
 * Run code
 * @param {object} evt
 */
function runEval(evt) {
	if (evt) evt.preventDefault();
	notification("Run code");
	return render();
}
/**
 * Render code
 */
function render() {
	let code = editor.querySelector(".CodeMirror-scroll");
	code.classList.add("clearing");
	let w = setTimeout(() => {
		code.classList.remove("clearing");
		Storage.val = codeEditor.getValue();
		let output = codeEditor.getValue();
		logger.innerHTML += parseCode(output);
		clearTimeout(w);
	}, 800);
}
/**
 * Show notifications
 * @param {string} txt
 */
function notification(txt) {
	infoDiv.innerHTML = `<span>${txt}</span>`;
	let w = setTimeout(() => {
		infoDiv.innerHTML = `<span>Console test</span>`;
		clearTimeout(w);
	}, 1000);
}

              
            
!
999px

Console