JSON Formatter Beautifier

<!DOCTYPE html>

<html lang="en" >
<head>
  <meta charset="UTF-8">
  <style>
  /* Code By Webdevtrick ( https://webdevtrick.com ) */
input, textarea {
  display: block;
  outline: 0;
  border: 0;
}
input:focus, textarea:focus {
  transition: 0.2s;
}
body {
  background-color: #fff;
  font-family: 'Open Sans', Helvetica, sans-serif;
}
.container {
  width: 100%;
  margin: 30px auto;
}
#wrap {
  width: 350px;
  max-width: 90%;
  float: left;
  margin-left: 2%;
  margin-right: 2%;
}
#two {
  width: 100px;
  float: left;
  margin-right: 2%;
  margin-left: 2%;
  padding-top: 15%;
}
#tree {
  width: 680px;
  max-width: 98%;
  float: left;
  margin-left: 1%;
   margin-top: -12px; 
}
.form__label {
  display: block;
  margin-bottom: 0.625em;
}
.form__label--hidden {
  border: 0;
  clip: rect(0 0 0 0);
  height: 1px;
  margin: -1px;
  overflow: hidden;
  padding: 0;
  position: absolute;
  width: 1px;
}
.form__input {
  width: 100%;
   height: 560px; 
  font-size: 1em;
  padding: 0.83333em;
  margin-bottom: 5px;
  border: 6px solid #ff5f5f;
  border-radius: 0.4em;
  background: #ebecec;
  color: #656D78;
  font-weight: 300;
}
.form__modal {
  width: 83%;
  font-size: 1em;
  padding: 0.83333em;
  margin-bottom: 5px;
  border-bottom: 6px solid #ff5f5f;
  border-radius: 0.4em;
  background: #ebecec;
  color: #656D78;
  font-weight: 300;
}

.load-json, .reset, .collapse, .expand, [type^="button"] {
  padding: 0.9375em 1.875em;
  border: 0;
  border-radius: 0.4em;
  color: #fff;
  text-transform: uppercase;
  font-size: 0.875em;
  font-weight: 400;
  transition: opacity 0.2s;
  display: block;
  width: 100%;
}
.load-json:hover, .reset:hover, .collapse:hover, .expand:hover, [type^="button"]:hover {
  opacity: 0.75;
  cursor: pointer;
}
.load-json {
  background-color:  #3BAFDA;
}
.reset {
  background-color: #e60023;
}
.collapse {
  background-color: #5cb85c;
}
.expand {
  background-color: #fd9d08;
}
[type^="button"] {
   margin-bottom: 1.42857em; 
  width: 120px;
  margin-right: 0.625em;
  outline:none;
}
.json-viewer {
  display: inline-block;
  overflow: scroll;
  height:  563px;
  width: 710px;
  max-width: 90%;
	color: #656D78;
  padding: 10px 10px 10px 20px;
  background-color: #ebecec;
  border: 6px solid #ff5f5f;
  border-radius: 0.4em;
  margin-bottom: 3px;
}

.json-viewer ul {
	list-style-type: none;
	margin: 0;
	margin: 0 0 0 1px;
	border-left: 3px dotted #ccc;
	padding-left: 2em;
}

.json-viewer .hide {
	display: none;
}

.json-viewer ul li .type-string,
.json-viewer ul li .type-date {
	color:  #ff5f5f;
}

.json-viewer ul li .type-boolean {
	color: #F6BB42;
	font-weight: bold;
}

.json-viewer ul li .type-number {
	color:   #e87376;
}

.json-viewer ul li .type-null {
	color: #EC87C0;
}

.json-viewer a.list-link {
	color: #656D78;
	text-decoration: none;
	position: relative;
}

.json-viewer a.list-link:before {
	color: #aaa;
	content: "\25BC";
	position: absolute;
	display: inline-block;
	width: 1em;
	left: -1em;
}

.json-viewer a.list-link.collapsed:before {
	content: "\25B6";
}

.json-viewer a.list-link.empty:before {
	content: "";
}

.json-viewer .items-ph {
	color: #aaa;
	padding: 0 1em;
}

.json-viewer .items-ph:hover {
	text-decoration: underline;
}
  
  </style>

</head>

<body>
  <div class="container">
    <div id="wrap">
      <form class="form">
        <label class="form__label--hidden" for="msg">Input json:</label>
        <textarea class="form__input" class="form__input" id="msg" placeholder="Input json..." rows="6"></textarea>
      </form>
    </div>
    <div id="two">
      <button type="button" class="load-json">Load</button>      
      <button type="button" class="collapse">Collapse</button>
      <button type="button" class="expand">Expand</button>
      <button type="button" class="reset">Reset</button>
    </div>
    <div id="tree">
      <div id="json"></div>
    </div>
  </div>

var jsonData = this._processInput(json);
		var walkEl = this._walk(jsonData, maxLvl, colAt, 0);

this._dom.container.innerHTML = "";
		this._dom.container.appendChild(walkEl);
	};

/**
	 * Get container with pre object - this container is used for visualise JSON data.
	 * 
	 * @return {Element}
	 */
	JSONViewer.prototype.getContainer = function() {
		return this._dom.container;
	};

/**
	 * Process input JSON - throws exception for unrecognized input.
	 * 
	 * @param {Object|Array} json Input value
	 * @return {Object|Array}
	 */
	JSONViewer.prototype._processInput = function(json) {
		if (json && typeof json === "object") {
			return json;
		}
		else {
			throw "Input value is not object or array!";
		}
	};

/**
	 * Recursive walk for input value.
	 * 
	 * @param {Object|Array} value Input value
	 * @param {Number} maxLvl Process only to max level, where 0..n, -1 unlimited
	 * @param {Number} colAt Collapse at level, where 0..n, -1 unlimited
	 * @param {Number} lvl Current level
	 */
	JSONViewer.prototype._walk = function(value, maxLvl, colAt, lvl) {
		var frag = document.createDocumentFragment();
		var isMaxLvl = maxLvl >= 0 && lvl >= maxLvl;
		var isCollapse = colAt >= 0 && lvl >= colAt;

switch (typeof value) {
			case "object":
				if (value) {
					var isArray = Array.isArray(value);
					var items = isArray ? value : Object.keys(value);

if (lvl === 0) {
						// root level
						var rootCount = this._createItemsCount(items.length);
						// hide/show
						var rootLink = this._createLink(isArray ? "[" : "{");

if (items.length) {
							rootLink.addEventListener("click", function() {
								if (isMaxLvl) return;

rootLink.classList.toggle("collapsed");
								rootCount.classList.toggle("hide");

// main list
								this._dom.container.querySelector("ul").classList.toggle("hide");
							}.bind(this));

if (isCollapse) {
								rootLink.classList.add("collapsed");
								rootCount.classList.remove("hide");
							}
						}
						else {
							rootLink.classList.add("empty");
						}

rootLink.appendChild(rootCount);
						frag.appendChild(rootLink);
					}

if (items.length && !isMaxLvl) {
						var len = items.length - 1;
						var ulList = document.createElement("ul");
						ulList.setAttribute("data-level", lvl);
						ulList.classList.add("type-" + (isArray ? "array" : "object"));

items.forEach(function(key, ind) {
							var item = isArray ? key : value[key];
							var li = document.createElement("li");

if (typeof item === "object") {
								var isEmpty = false;

// null && date
								if (!item || item instanceof Date) {
									li.appendChild(document.createTextNode(isArray ? "" : key + ": "));
									li.appendChild(this._createSimple(item ? item : null));
								}
								// array & object
								else {
									var itemIsArray = Array.isArray(item);
									var itemLen = itemIsArray ? item.length : Object.keys(item).length;

// empty
									if (!itemLen) {
										li.appendChild(document.createTextNode(key + ": " + (itemIsArray ? "[]" : "{}")));
									}
									else {
										// 1+ items
										var itemTitle = (typeof key === "string" ? key + ": " : "") + (itemIsArray ? "[" : "{");
										var itemLink = this._createLink(itemTitle);
										var itemsCount = this._createItemsCount(itemLen);

// maxLvl - only text, no link
										if (maxLvl >= 0 && lvl + 1 >= maxLvl) {
											li.appendChild(document.createTextNode(itemTitle));
										}
										else {
											itemLink.appendChild(itemsCount);
											li.appendChild(itemLink);
										}

li.appendChild(this._walk(item, maxLvl, colAt, lvl + 1));
										li.appendChild(document.createTextNode(itemIsArray ? "]" : "}"));
										
										var list = li.querySelector("ul");
										var itemLinkCb = function() {
											itemLink.classList.toggle("collapsed");
											itemsCount.classList.toggle("hide");
											list.classList.toggle("hide");
										};

// hide/show
										itemLink.addEventListener("click", itemLinkCb);

// collapse lower level
										if (colAt >= 0 && lvl + 1 >= colAt) {
											itemLinkCb();
										}
									}
								}
							}
							// simple values
							else {
								// object keys with key:
								if (!isArray) {
									li.appendChild(document.createTextNode(key + ": "));
								}

// recursive
								li.appendChild(this._walk(item, maxLvl, colAt, lvl + 1));
							}

// add comma to the end
							if (ind < len) {
								li.appendChild(document.createTextNode(","));
							}

ulList.appendChild(li);
						}, this);

frag.appendChild(ulList);
					}
					else if (items.length && isMaxLvl) {
						var itemsCount = this._createItemsCount(items.length);
						itemsCount.classList.remove("hide");

frag.appendChild(itemsCount);
					}

if (lvl === 0) {
						// empty root
						if (!items.length) {
							var itemsCount = this._createItemsCount(0);
							itemsCount.classList.remove("hide");

frag.appendChild(itemsCount);
						}

// root cover
						frag.appendChild(document.createTextNode(isArray ? "]" : "}"));

// collapse
						if (isCollapse) {
							frag.querySelector("ul").classList.add("hide");
						}
					}
					break;
				}

default:
				// simple values
				frag.appendChild(this._createSimple(value));
				break;
		}

return frag;
	};

/**
	 * Create simple value (no object|array).
	 * 
	 * @param  {Number|String|null|undefined|Date} value Input value
	 * @return {Element}
	 */
	JSONViewer.prototype._createSimple = function(value) {
		var spanEl = document.createElement("span");
		var type = typeof value;
		var txt = value;

if (type === "string") {
			txt = '"' + value + '"';
		}
		else if (value === null) {
			type = "null";
			txt = "null";
		}
		else if (value === undefined) {
			txt = "undefined";
		}
		else if (value instanceof Date) {
			type = "date";
			txt = value.toString();
		}

spanEl.classList.add("type-" + type);
		spanEl.innerHTML = txt;

return spanEl;
	};

/**
	 * Create items count element.
	 * 
	 * @param  {Number} count Items count
	 * @return {Element}
	 */
	JSONViewer.prototype._createItemsCount = function(count) {
		var itemsCount = document.createElement("span");
		itemsCount.classList.add("items-ph");
		itemsCount.classList.add("hide");
		itemsCount.innerHTML = this._getItemsTitle(count);

return itemsCount;
	};

/**
	 * Create clickable link.
	 * 
	 * @param  {String} title Link title
	 * @return {Element}
	 */
	JSONViewer.prototype._createLink = function(title) {
		var linkEl = document.createElement("a");
		linkEl.classList.add("list-link");
		linkEl.href = "javascript:void(0)";
		linkEl.innerHTML = title || "";

return linkEl;
	};

/**
	 * Get correct item|s title for count.
	 * 
	 * @param  {Number} count Items count
	 * @return {String}
	 */
	JSONViewer.prototype._getItemsTitle = function(count) {
		var itemsTxt = count > 1 || count === 0 ? "items" : "item";

return (count + " " + itemsTxt);
	};

return JSONViewer;
})();

var jsonObj = {};
var jsonViewer = new JSONViewer();
document.querySelector("#json").appendChild(jsonViewer.getContainer());

var textarea = document.querySelector("textarea");
textarea.value = JSON.stringify([
  {
  "links": {
    "self": "http://example.com/articles",
    "next": "http://example.com/articles?page[offset]=2",
    "last": "http://example.com/articles?page[offset]=10"
  },
  "data": [{
    "type": "articles",
    "id": "1",
    "attributes": {
      "title": "JSON:API paints my bikeshed!"
    },
    "relationships": {
      "author": {
        "links": {
          "self": "http://example.com/articles/1/relationships/author",
          "related": "http://example.com/articles/1/author"
        },
        "data": { "type": "people", "id": "9" }
      },
      "comments": {
        "links": {
          "self": "http://example.com/articles/1/relationships/comments",
          "related": "http://example.com/articles/1/comments"
        },
        "data": [
          { "type": "comments", "id": "5" },
          { "type": "comments", "id": "12" }
        ]
      }
    },
    "links": {
      "self": "http://example.com/articles/1"
    }
  }],
  "included": [{
    "type": "people",
    "id": "9",
    "attributes": {
      "firstName": "Dan",
      "lastName": "Gebhardt",
      "twitter": "dgeb"
    },
    "links": {
      "self": "http://example.com/people/9"
    }
  }, {
    "type": "comments",
    "id": "5",
    "attributes": {
      "body": "First!"
    },
    "relationships": {
      "author": {
        "data": { "type": "people", "id": "2" }
      }
    },
    "links": {
      "self": "http://example.com/comments/5"
    }
  }, {
    "type": "comments",
    "id": "12",
    "attributes": {
      "body": "I like XML better"
    },
    "relationships": {
      "author": {
        "data": { "type": "people", "id": "9" }
      }
    },
    "links": {
      "self": "http://example.com/comments/12"
    }
  }]
}
]);

// textarea value to JSON object
var setJSON = function () {
  try {
    var value = textarea.value;
    jsonObj = JSON.parse(value);
  }
  catch (err) {
    alert(err);
  }
};

// load default value
setJSON();

var loadJsonBtn = document.querySelector("button.load-json");
var collapseBtn = document.querySelector("button.collapse");
var expandBtn = document.querySelector("button.expand");
var resetBtn = document.querySelector("button.reset");

loadJsonBtn.addEventListener("click", function () {
  setJSON();
  jsonViewer.showJSON(jsonObj);
});

collapseBtn.addEventListener("click", function () {
  jsonViewer.showJSON(jsonObj, null, 1);
});

expandBtn.addEventListener("click", function () {
  setJSON();
  jsonViewer.showJSON(jsonObj);
});

resetBtn.addEventListener("click", function () {
  document.getElementById("msg").value = "";
});  
  
  </script>

</body>
</html>

demo

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