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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>SOON from JSON</title>
</head>
<body>
<div class="main">
<textarea id="json" placeholder="JSON"></textarea>
<div class="buttons"><button id="go">-&gt;</button><br><br><button id="back">&lt;-</button></div>
<textarea id="soon" placeholder="SOON"></textarea>
</div>
</body>
</html>
 
textarea {
  height: 400px;
  width: 40%;
}
​
.main textarea,
.main button {
  vertical-align: middle;
}
​
.main .buttons {
  display: inline-block;
}
 
"use strict";
var SOON = (function () {
    function SOON() {
    }
    SOON.prototype.array = function (arr) {
        var stack = [];
        var length = arr.length;
        for (var i = 0; i < length; i++) {
            stack.push(this.stringify(arr[i]));
        }
        stack.push("A" + length);
        return stack.join(' ');
    };
    SOON.prototype.object = function (obj) {
        var stack = [];
        var length = 0;
        for (var key in obj) {
            stack.push(this.stringify(obj[key]));
            stack.push("\"" + key + "\"");
            length++;
        }
        stack.push("O" + length);
        return stack.join(' ');
    };
    SOON.prototype.string = function (str) {
        return "\"" + str + "\"";
    };
    SOON.prototype.number = function (num) {
        return "" + num;
    };
    SOON.prototype.boolean = function (bool) {
        return bool ? 'True' : 'False';
    };
    SOON.prototype.stringify = function (obj) {
        var stack = [];
        if (Array.isArray(obj)) {
            stack.push(this.array(obj));
        }
        else if (typeof obj === 'string') {
            stack.push(this.string(obj));
        }
        else if (typeof obj === 'number') {
            stack.push(this.number(obj));
        }
        else if (typeof obj === 'boolean') {
            stack.push(this.boolean(obj));
        }
        else if (obj === null || obj === undefined) {
            stack.push('Null');
        }
        else {
            stack.push(this.object(obj));
        }
        return stack.join(' ');
    };
    SOON.prototype.parse = function (son) {
        var stack = [];
        var _son = son.split(' ');
        var sonItems = [];
        for (var i = 0; i < _son.length; i++) {
            if (/^".*[^"]$/.test(_son[i])) {
                var _sonItem = [];
                while (!/^[^"].*"$/.test(_son[i])) {
                    _sonItem.push(_son[i++]);
                }
                _sonItem.push(_son[i]);
                sonItems.push(_sonItem.join(' '));
            }
            else {
                if (_son[i] === 'True') {
                    sonItems.push(true);
                }
                else if (_son[i] === 'False') {
                    sonItems.push(false);
                }
                else if (_son[i] === 'Null') {
                    sonItems.push(null);
                }
                else {
                    sonItems.push(_son[i]);
                }
            }
        }
        for (var i = 0; i < sonItems.length; i++) {
            var item = sonItems[i];
            if (typeof item === 'string' && /^A/i.test(item)) {
                var matches = item.match(/A(\d+)/i);
                if (!matches || matches.length <= 0) {
                    throw new Error('Error: invalid array length.');
                }
                var length_1 = Number(matches[1]);
                var array = [];
                for (var _i = 0; _i < length_1; _i++) {
                    if (stack.length === 0) {
                        throw new Error('Error: stack is empty.');
                    }
                    var value = stack.pop();
                    if (typeof value === 'string') {
                        if (/^".*"$/.test(value)) {
                            array.unshift(value.replace(/^"|"$/g, ''));
                        }
                        else if (value === 'True' || value === 'False') {
                            array.unshift(value === 'True' ? true : false);
                        }
                        else if (value === 'Null') {
                            array.unshift(null);
                        }
                        else {
                            array.unshift(Number(value));
                        }
                    }
                    else {
                        array.unshift(value);
                    }
                }
                stack.push(array);
            }
            else if (typeof item === 'string' && /^O/i.test(item)) {
                var matches = item.match(/O(\d+)/i);
                if (!matches || matches.length <= 0) {
                    throw new Error('Error: invalid object length.');
                }
                var length_2 = Number(matches[1]);
                var object = {};
                for (var _i = 0; _i < length_2; _i++) {
                    if (stack.length === 0) {
                        throw new Error('Error: stack is empty.');
                    }
                    var key = stack.pop().replace(/^"|"$/g, '');
                    if (stack.length === 0) {
                        throw new Error('Error: stack is empty.');
                    }
                    var value = stack.pop();
                    if (typeof value === 'string') {
                        if (/^".*"$/.test(value)) {
                            object[key] = value.replace(/^"|"$/g, '');
                        }
                        else if (value === 'True' || value === 'False') {
                            object[key] = (value === 'True' ? true : false);
                        }
                        else if (value === 'Null') {
                            object[key] = null;
                        }
                        else {
                            object[key] = Number(value);
                        }
                    }
                    else {
                        object[key] = value;
                    }
                }
                stack.push(object);
            }
            else {
                stack.push(item);
            }
        }
        return stack[0];
    };
    return SOON;
}());
​
var soon = new SOON();
​
document.getElementById('go').onclick = function() {
  document.getElementById('soon').value = soon.stringify(JSON.parse(document.getElementById('json').value));
}
​
document.getElementById('back').onclick = function() {
  document.getElementById('json').value = JSON.stringify(soon.parse(document.getElementById('soon').value), null, '  ');
}
Output

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