2 http://www.JSON.org/json2.js
7 NO WARRANTY EXPRESSED OR IMPLIED. USE AT YOUR OWN RISK.
9 See http://www.JSON.org/js.html
11 This file creates a global JSON object containing two methods: stringify
14 JSON.stringify(value, replacer, space)
15 value any JavaScript value, usually an object or array.
17 replacer an optional parameter that determines how object
18 values are stringified for objects. It can be a
19 function or an array of strings.
21 space an optional parameter that specifies the indentation
22 of nested structures. If it is omitted, the text will
23 be packed without extra whitespace. If it is a number,
24 it will specify the number of spaces to indent at each
25 level. If it is a string (such as '\t' or ' '),
26 it contains the characters used to indent at each level.
28 This method produces a JSON text from a JavaScript value.
30 When an object value is found, if the object contains a toJSON
31 method, its toJSON method will be called and the result will be
32 stringified. A toJSON method does not serialize: it returns the
33 value represented by the name/value pair that should be serialized,
34 or undefined if nothing should be serialized. The toJSON method
35 will be passed the key associated with the value, and this will be
36 bound to the object holding the key.
38 For example, this would serialize Dates as ISO strings.
40 Date.prototype.toJSON = function (key) {
42 // Format integers to have at least two digits.
43 return n < 10 ? '0' + n : n;
46 return this.getUTCFullYear() + '-' +
47 f(this.getUTCMonth() + 1) + '-' +
48 f(this.getUTCDate()) + 'T' +
49 f(this.getUTCHours()) + ':' +
50 f(this.getUTCMinutes()) + ':' +
51 f(this.getUTCSeconds()) + 'Z';
54 You can provide an optional replacer method. It will be passed the
55 key and value of each member, with this bound to the containing
56 object. The value that is returned from your method will be
57 serialized. If your method returns undefined, then the member will
58 be excluded from the serialization.
60 If the replacer parameter is an array of strings, then it will be
61 used to select the members to be serialized. It filters the results
62 such that only members with keys listed in the replacer array are
65 Values that do not have JSON representations, such as undefined or
66 functions, will not be serialized. Such values in objects will be
67 dropped; in arrays they will be replaced with null. You can use
68 a replacer function to replace those with JSON values.
69 JSON.stringify(undefined) returns undefined.
71 The optional space parameter produces a stringification of the
72 value that is filled with line breaks and indentation to make it
75 If the space parameter is a non-empty string, then that string will
76 be used for indentation. If the space parameter is a number, then
77 the indentation will be that many spaces.
81 text = JSON.stringify(['e', {pluribus: 'unum'}]);
82 // text is '["e",{"pluribus":"unum"}]'
85 text = JSON.stringify(['e', {pluribus: 'unum'}], null, '\t');
86 // text is '[\n\t"e",\n\t{\n\t\t"pluribus": "unum"\n\t}\n]'
88 text = JSON.stringify([new Date()], function (key, value) {
89 return this[key] instanceof Date ?
90 'Date(' + this[key] + ')' : value;
92 // text is '["Date(---current time---)"]'
95 JSON.parse(text, reviver)
96 This method parses a JSON text to produce an object or array.
97 It can throw a SyntaxError exception.
99 The optional reviver parameter is a function that can filter and
100 transform the results. It receives each of the keys and values,
101 and its return value is used instead of the original value.
102 If it returns what it received, then the structure is not modified.
103 If it returns undefined then the member is deleted.
107 // Parse the text. Values that look like ISO date strings will
108 // be converted to Date objects.
110 myData = JSON.parse(text, function (key, value) {
112 if (typeof value === 'string') {
114 /^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2}(?:\.\d*)?)Z$/.exec(value);
116 return new Date(Date.UTC(+a[1], +a[2] - 1, +a[3], +a[4],
123 myData = JSON.parse('["Date(09/09/2001)"]', function (key, value) {
125 if (typeof value === 'string' &&
126 value.slice(0, 5) === 'Date(' &&
127 value.slice(-1) === ')') {
128 d = new Date(value.slice(5, -1));
137 This is a reference implementation. You are free to copy, modify, or
140 This code should be minified before deployment.
141 See http://javascript.crockford.com/jsmin.html
143 USE YOUR OWN COPY. IT IS EXTREMELY UNWISE TO LOAD CODE FROM SERVERS YOU DO
147 /*jslint evil: true */
151 /*members "", "\b", "\t", "\n", "\f", "\r", "\"", JSON, "\\", apply,
152 call, charCodeAt, getUTCDate, getUTCFullYear, getUTCHours,
153 getUTCMinutes, getUTCMonth, getUTCSeconds, hasOwnProperty, join,
154 lastIndex, length, parse, prototype, push, replace, slice, stringify,
155 test, toJSON, toString, valueOf
158 // Create a JSON object only if one does not already exist. We create the
159 // methods in a closure to avoid creating global variables.
167 // Format integers to have at least two digits.
168 return n < 10 ? '0' + n : n;
171 if (typeof Date.prototype.toJSON !== 'function') {
173 Date.prototype.toJSON = function (key) {
175 return this.getUTCFullYear() + '-' +
176 f(this.getUTCMonth() + 1) + '-' +
177 f(this.getUTCDate()) + 'T' +
178 f(this.getUTCHours()) + ':' +
179 f(this.getUTCMinutes()) + ':' +
180 f(this.getUTCSeconds()) + 'Z';
183 String.prototype.toJSON =
184 Number.prototype.toJSON =
185 Boolean.prototype.toJSON = function (key) {
186 return this.valueOf();
190 var cx = /[\u0000\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g,
191 escapable = /[\\\"\x00-\x1f\x7f-\x9f\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g,
194 meta = { // table of character substitutions
206 function quote(string) {
208 // If the string contains no control characters, no quote characters, and no
209 // backslash characters, then we can safely slap some quotes around it.
210 // Otherwise we must also replace the offending characters with safe escape
213 escapable.lastIndex = 0;
214 return escapable.test(string) ?
215 '"' + string.replace(escapable, function (a) {
217 return typeof c === 'string' ? c :
218 '\\u' + ('0000' + a.charCodeAt(0).toString(16)).slice(-4);
224 function str(key, holder) {
226 // Produce a string from holder[key].
228 var i, // The loop counter.
229 k, // The member key.
230 v, // The member value.
236 // If the value has a toJSON method, call it to obtain a replacement value.
238 if (value && typeof value === 'object' &&
239 typeof value.toJSON === 'function') {
240 value = value.toJSON(key);
243 // If we were called with a replacer function, then call the replacer to
244 // obtain a replacement value.
246 if (typeof rep === 'function') {
247 value = rep.call(holder, key, value);
250 // What happens next depends on the value's type.
252 switch (typeof value) {
258 // JSON numbers must be finite. Encode non-finite numbers as null.
260 return isFinite(value) ? String(value) : 'null';
265 // If the value is a boolean or null, convert it to a string. Note:
266 // typeof null does not produce 'null'. The case is included here in
267 // the remote chance that this gets fixed someday.
269 return String(value);
271 // If the type is 'object', we might be dealing with an object or an array or
276 // Due to a specification blunder in ECMAScript, typeof null is 'object',
277 // so watch out for that case.
283 // Make an array to hold the partial results of stringifying this object value.
288 // Is the value an array?
290 if (Object.prototype.toString.apply(value) === '[object Array]') {
292 // The value is an array. Stringify every element. Use null as a placeholder
293 // for non-JSON values.
295 length = value.length;
296 for (i = 0; i < length; i += 1) {
297 partial[i] = str(i, value) || 'null';
300 // Join all of the elements together, separated with commas, and wrap them in
303 v = partial.length === 0 ? '[]' :
305 partial.join(',\n' + gap) + '\n' +
307 '[' + partial.join(',') + ']';
312 // If the replacer is an array, use it to select the members to be stringified.
314 if (rep && typeof rep === 'object') {
316 for (i = 0; i < length; i += 1) {
318 if (typeof k === 'string') {
321 partial.push(quote(k) + (gap ? ': ' : ':') + v);
327 // Otherwise, iterate through all of the keys in the object.
330 if (Object.hasOwnProperty.call(value, k)) {
333 partial.push(quote(k) + (gap ? ': ' : ':') + v);
339 // Join all of the member texts together, separated with commas,
340 // and wrap them in braces.
342 v = partial.length === 0 ? '{}' :
343 gap ? '{\n' + gap + partial.join(',\n' + gap) + '\n' +
344 mind + '}' : '{' + partial.join(',') + '}';
350 // If the JSON object does not yet have a stringify method, give it one.
352 if (typeof JSON.stringify !== 'function') {
353 JSON.stringify = function (value, replacer, space) {
355 // The stringify method takes a value and an optional replacer, and an optional
356 // space parameter, and returns a JSON text. The replacer can be a function
357 // that can replace values, or an array of strings that will select the keys.
358 // A default replacer method can be provided. Use of the space parameter can
359 // produce text that is more easily readable.
365 // If the space parameter is a number, make an indent string containing that
368 if (typeof space === 'number') {
369 for (i = 0; i < space; i += 1) {
373 // If the space parameter is a string, it will be used as the indent string.
375 } else if (typeof space === 'string') {
379 // If there is a replacer, it must be a function or an array.
380 // Otherwise, throw an error.
383 if (replacer && typeof replacer !== 'function' &&
384 (typeof replacer !== 'object' ||
385 typeof replacer.length !== 'number')) {
386 throw new Error('JSON.stringify');
389 // Make a fake root object containing our value under the key of ''.
390 // Return the result of stringifying the value.
392 return str('', {'': value});
397 // If the JSON object does not yet have a parse method, give it one.
399 if (typeof JSON.parse !== 'function') {
400 JSON.parse = function (text, reviver) {
402 // The parse method takes a text and an optional reviver function, and returns
403 // a JavaScript value if the text is a valid JSON text.
407 function walk(holder, key) {
409 // The walk method is used to recursively walk the resulting structure so
410 // that modifications can be made.
412 var k, v, value = holder[key];
413 if (value && typeof value === 'object') {
415 if (Object.hasOwnProperty.call(value, k)) {
417 if (v !== undefined) {
425 return reviver.call(holder, key, value);
429 // Parsing happens in four stages. In the first stage, we replace certain
430 // Unicode characters with escape sequences. JavaScript handles many characters
431 // incorrectly, either silently deleting them, or treating them as line endings.
435 text = text.replace(cx, function (a) {
437 ('0000' + a.charCodeAt(0).toString(16)).slice(-4);
441 // In the second stage, we run the text against regular expressions that look
442 // for non-JSON patterns. We are especially concerned with '()' and 'new'
443 // because they can cause invocation, and '=' because it can cause mutation.
444 // But just to be safe, we want to reject all unexpected forms.
446 // We split the second stage into 4 regexp operations in order to work around
447 // crippling inefficiencies in IE's and Safari's regexp engines. First we
448 // replace the JSON backslash pairs with '@' (a non-JSON character). Second, we
449 // replace all simple value tokens with ']' characters. Third, we delete all
450 // open brackets that follow a colon or comma or that begin the text. Finally,
451 // we look to see that the remaining characters are only whitespace or ']' or
452 // ',' or ':' or '{' or '}'. If that is so, then the text is safe for eval.
455 test(text.replace(/\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g, '@').
456 replace(/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g, ']').
457 replace(/(?:^|:|,)(?:\s*\[)+/g, ''))) {
459 // In the third stage we use the eval function to compile the text into a
460 // JavaScript structure. The '{' operator is subject to a syntactic ambiguity
461 // in JavaScript: it can begin a block or an object literal. We wrap the text
462 // in parens to eliminate the ambiguity.
464 j = eval('(' + text + ')');
466 // In the optional fourth stage, we recursively walk the new structure, passing
467 // each name/value pair to a reviver function for possible transformation.
469 return typeof reviver === 'function' ?
470 walk({'': j}, '') : j;
473 // If the text is not JSON parseable, then a SyntaxError is thrown.
475 throw new SyntaxError('JSON.parse');