A compact one line version of the json2.js JSON.stringify() and JSON.parse() functions. The function returns the library as a text string so you can use it in an expression.

JSONforExpression.jsx

  function libForExpressions(){
    var theLib = '(function includeJSON(){ if (!this.JSON) { this.JSON = {}; } (function () { function f(n) { return n < 10 ? \'0\' + n : n; } if (typeof Date.prototype.toJSON !== \'function\') { Date.prototype.toJSON = function (key) { return isFinite(this.valueOf()) ? this.getUTCFullYear()   + \'-\' + f(this.getUTCMonth() + 1) + \'-\' + f(this.getUTCDate())      + \'T\' + f(this.getUTCHours())     + \':\' + f(this.getUTCMinutes())   + \':\' + f(this.getUTCSeconds())   + \'Z\' : null; }; String.prototype.toJSON = Number.prototype.toJSON = Boolean.prototype.toJSON = function (key) { return this.valueOf(); }; } var cx = \/[\\u0000\\u00ad\\u0600-\\u0604\\u070f\\u17b4\\u17b5\\u200c-\\u200f\\u2028-\\u202f\\u2060-\\u206f\\ufeff\\ufff0-\\uffff]\/g, escapable = \/[\\\\\\\"\\x00-\\x1f\\x7f-\\x9f\\u00ad\\u0600-\\u0604\\u070f\\u17b4\\u17b5\\u200c-\\u200f\\u2028-\\u202f\\u2060-\\u206f\\ufeff\\ufff0-\\uffff]\/g, gap, indent, meta = { \'\\b\': \'\\\\b\', \'\\t\': \'\\\\t\', \'\\n\': \'\\\\n\', \'\\f\': \'\\\\f\', \'\\r\': \'\\\\r\', \'\"\' : \'\\\\\"\', \'\\\\\': \'\\\\\\\\\' }, rep; function quote(string) { escapable.lastIndex = 0; return escapable.test(string) ? \'\"\' + string.replace(escapable, function (a) { var c = meta[a]; return typeof c === \'string\' ? c : \'\\\\u\' + (\'0000\' + a.charCodeAt(0).toString(16)).slice(-4); }) + \'\"\' : \'\"\' + string + \'\"\'; } function str(key, holder) { var i, k, v, length, mind = gap, partial, value = holder[key]; if (value && typeof value === \'object\' && typeof value.toJSON === \'function\') { value = value.toJSON(key); } if (typeof rep === \'function\') { value = rep.call(holder, key, value); } switch (typeof value) { case \'string\': return quote(value); case \'number\': return isFinite(value) ? String(value) : \'null\'; case \'boolean\': case \'null\': return String(value); case \'object\': if (!value) { return \'null\'; } gap += indent; partial = []; if (Object.prototype.toString.apply(value) === \'[object Array]\') { length = value.length; for (i = 0; i < length; i += 1) { partial[i] = str(i, value) || \'null\'; } v = partial.length === 0 ? \'[]\' : gap ? \'[\\n\' + gap + partial.join(\',\\n\' + gap) + \'\\n\' + mind + \']\' : \'[\' + partial.join(\',\') + \']\'; gap = mind; return v; } if (rep && typeof rep === \'object\') { length = rep.length; for (i = 0; i < length; i += 1) { k = rep[i]; if (typeof k === \'string\') { v = str(k, value); if (v) { partial.push(quote(k) + (gap ? \': \' : \':\') + v); } } } } else { for (k in value) { if (Object.hasOwnProperty.call(value, k)) { v = str(k, value); if (v) { partial.push(quote(k) + (gap ? \': \' : \':\') + v); } } } } v = partial.length === 0 ? \'{}\' : gap ? \'{\\n\' + gap + partial.join(\',\\n\' + gap) + \'\\n\' + mind + \'}\' : \'{\' + partial.join(\',\') + \'}\'; gap = mind; return v; } } if (typeof JSON.stringify !== \'function\') { JSON.stringify = function (value, replacer, space) { var i; gap = \'\'; indent = \'\'; if (typeof space === \'number\') { for (i = 0; i < space; i += 1) { indent += \' \'; } } else if (typeof space === \'string\') { indent = space; } rep = replacer; if (replacer && typeof replacer !== \'function\' && (typeof replacer !== \'object\' || typeof replacer.length !== \'number\')) { throw new Error(\'JSON.stringify\'); } return str(\'\', {\'\': value}); }; } if (typeof JSON.parse !== \'function\') { JSON.parse = function (text, reviver) { var j; function walk(holder, key) { var k, v, value = holder[key]; if (value && typeof value === \'object\') { for (k in value) { if (Object.hasOwnProperty.call(value, k)) { v = walk(value, k); if (v !== undefined) { value[k] = v; } else { delete value[k]; } } } } return reviver.call(holder, key, value); } text = String(text); cx.lastIndex = 0; if (cx.test(text)) { text = text.replace(cx, function (a) { return \'\\\\u\' + (\'0000\' + a.charCodeAt(0).toString(16)).slice(-4); }); } if (\/^[\\],:{}\\s]*$\/ .test(text.replace(\/\\\\(?:[\"\\\\\\\/bfnrt]|u[0-9a-fA-F]{4})\/g, \'@\') .replace(\/\"[^\"\\\\\\n\\r]*\"|true|false|null|-?\\d+(?:\\.\\d*)?(?:[eE][+\\-]?\\d+)?\/g, \']\') .replace(\/(?:^|:|,)(?:\\s*\\[)+\/g, \'\'))) { j = eval(\'(\' + text + \')\'); return typeof reviver === \'function\' ? walk({\'\': j}, \'\') : j; } throw new SyntaxError(\'JSON.parse\'); }; } }()); })();\n';
    return theLib;
  };