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
12 This code should be minified before deployment.
13 See http://javascript.crockford.com/jsmin.html
15 USE YOUR OWN COPY. IT IS EXTREMELY UNWISE TO LOAD CODE FROM SERVERS YOU DO
19 This file creates a global JSON object containing two methods: stringify
22 JSON.stringify(value, replacer, space)
23 value any JavaScript value, usually an object or array.
25 replacer an optional parameter that determines how object
26 values are stringified for objects. It can be a
27 function or an array of strings.
29 space an optional parameter that specifies the indentation
30 of nested structures. If it is omitted, the text will
31 be packed without extra whitespace. If it is a number,
32 it will specify the number of spaces to indent at each
33 level. If it is a string (such as '\t' or ' '),
34 it contains the characters used to indent at each level.
36 This method produces a JSON text from a JavaScript value.
38 When an object value is found, if the object contains a toJSON
39 method, its toJSON method will be called and the result will be
40 stringified. A toJSON method does not serialize: it returns the
41 value represented by the name/value pair that should be serialized,
42 or undefined if nothing should be serialized. The toJSON method
43 will be passed the key associated with the value, and this will be
46 For example, this would serialize Dates as ISO strings.
48 Date.prototype.toJSON = function (key) {
50 // Format integers to have at least two digits.
51 return n < 10 ? '0' + n : n;
54 return this.getUTCFullYear() + '-' +
55 f(this.getUTCMonth() + 1) + '-' +
56 f(this.getUTCDate()) + 'T' +
57 f(this.getUTCHours()) + ':' +
58 f(this.getUTCMinutes()) + ':' +
59 f(this.getUTCSeconds()) + 'Z';
62 You can provide an optional replacer method. It will be passed the
63 key and value of each member, with this bound to the containing
64 object. The value that is returned from your method will be
65 serialized. If your method returns undefined, then the member will
66 be excluded from the serialization.
68 If the replacer parameter is an array of strings, then it will be
69 used to select the members to be serialized. It filters the results
70 such that only members with keys listed in the replacer array are
73 Values that do not have JSON representations, such as undefined or
74 functions, will not be serialized. Such values in objects will be
75 dropped; in arrays they will be replaced with null. You can use
76 a replacer function to replace those with JSON values.
77 JSON.stringify(undefined) returns undefined.
79 The optional space parameter produces a stringification of the
80 value that is filled with line breaks and indentation to make it
83 If the space parameter is a non-empty string, then that string will
84 be used for indentation. If the space parameter is a number, then
85 the indentation will be that many spaces.
89 text = JSON.stringify(['e', {pluribus: 'unum'}]);
90 // text is '["e",{"pluribus":"unum"}]'
93 text = JSON.stringify(['e', {pluribus: 'unum'}], null, '\t');
94 // text is '[\n\t"e",\n\t{\n\t\t"pluribus": "unum"\n\t}\n]'
96 text = JSON.stringify([new Date()], function (key, value) {
97 return this[key] instanceof Date ?
98 'Date(' + this[key] + ')' : value;
100 // text is '["Date(---current time---)"]'
103 JSON.parse(text, reviver)
104 This method parses a JSON text to produce an object or array.
105 It can throw a SyntaxError exception.
107 The optional reviver parameter is a function that can filter and
108 transform the results. It receives each of the keys and values,
109 and its return value is used instead of the original value.
110 If it returns what it received, then the structure is not modified.
111 If it returns undefined then the member is deleted.
115 // Parse the text. Values that look like ISO date strings will
116 // be converted to Date objects.
118 myData = JSON.parse(text, function (key, value) {
120 if (typeof value === 'string') {
122 /^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2}(?:\.\d*)?)Z$/.exec(value);
124 return new Date(Date.UTC(+a[1], +a[2] - 1, +a[3], +a[4],
131 myData = JSON.parse('["Date(09/09/2001)"]', function (key, value) {
133 if (typeof value === 'string' &&
134 value.slice(0, 5) === 'Date(' &&
135 value.slice(-1) === ')') {
136 d = new Date(value.slice(5, -1));
145 This is a reference implementation. You are free to copy, modify, or
149 /*jslint evil: true, strict: false, regexp: false */
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
159 // Create a JSON object only if one does not already exist. We create the
160 // methods in a closure to avoid creating global variables.
173 // Format integers to have at least two digits.
174 return n
< 10 ? '0' + n
: n
;
177 if (typeof Date
.prototype.toJSON
!== 'function')
180 Date
.prototype.toJSON = function(key
)
183 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;
186 String
.prototype.toJSON
= Number
.prototype.toJSON
= Boolean
.prototype.toJSON = function(key
)
188 return this.valueOf();
192 var cx
= /[\u0000\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g,
193 escapable
= /[\\\"\x00-\x1f\x7f-\x9f\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g,
194 gap
, indent
, meta
= { // table of character substitutions
206 function quote(string
)
209 // If the string contains no control characters, no quote characters, and no
210 // backslash characters, then we can safely slap some quotes around it.
211 // Otherwise we must also replace the offending characters with safe escape
213 escapable
.lastIndex
= 0;
214 return escapable
.test(string
) ? '"' + string
.replace(escapable
, function(a
)
217 return typeof c
=== 'string' ? c
: '\\u' + ('0000' + a
.charCodeAt(0).toString(16)).slice(-4);
218 }) + '"' : '"' + string
+ '"';
222 function str(key
, holder
)
225 // Produce a string from holder[key].
226 var i
, // The loop counter.
227 k
, // The member key.
228 v
, // The member value.
230 partial
, value
= holder
[key
];
232 // If the value has a toJSON method, call it to obtain a replacement value.
233 if (value
&& typeof value
=== 'object' && typeof value
.toJSON
=== 'function')
235 value
= value
.toJSON(key
);
238 // If we were called with a replacer function, then call the replacer to
239 // obtain a replacement value.
240 if (typeof rep
=== 'function')
242 value
= rep
.call(holder
, key
, value
);
245 // What happens next depends on the value's type.
246 switch (typeof value
)
253 // JSON numbers must be finite. Encode non-finite numbers as null.
254 return isFinite(value
) ? String(value
) : 'null';
259 // If the value is a boolean or null, convert it to a string. Note:
260 // typeof null does not produce 'null'. The case is included here in
261 // the remote chance that this gets fixed someday.
262 return String(value
);
264 // If the type is 'object', we might be dealing with an object or an array or
268 // Due to a specification blunder in ECMAScript, typeof null is 'object',
269 // so watch out for that case.
275 // Make an array to hold the partial results of stringifying this object value.
279 // Is the value an array?
280 if (Object
.prototype.toString
.apply(value
) === '[object Array]')
283 // The value is an array. Stringify every element. Use null as a placeholder
284 // for non-JSON values.
285 length
= value
.length
;
286 for (i
= 0; i
< length
; i
+= 1)
288 partial
[i
] = str(i
, value
) || 'null';
291 // Join all of the elements together, separated with commas, and wrap them in
293 v
= partial
.length
=== 0 ? '[]' : gap
? '[\n' + gap
+ partial
.join(',\n' + gap
) + '\n' + mind
+ ']' : '[' + partial
.join(',') + ']';
298 // If the replacer is an array, use it to select the members to be stringified.
299 if (rep
&& typeof rep
=== 'object')
302 for (i
= 0; i
< length
; i
+= 1)
304 if (typeof rep
[i
] === 'string')
310 partial
.push(quote(k
) + (gap
? ': ' : ':') + v
);
318 // Otherwise, iterate through all of the keys in the object.
321 if (Object
.prototype.hasOwnProperty
.call(value
, k
))
326 partial
.push(quote(k
) + (gap
? ': ' : ':') + v
);
332 // Join all of the member texts together, separated with commas,
333 // and wrap them in braces.
334 v
= partial
.length
=== 0 ? '{}' : gap
? '{\n' + gap
+ partial
.join(',\n' + gap
) + '\n' + mind
+ '}' : '{' + partial
.join(',') + '}';
340 // If the JSON object does not yet have a stringify method, give it one.
341 if (typeof JSON
.stringify
!== 'function')
343 JSON
.stringify = function(value
, replacer
, space
)
346 // The stringify method takes a value and an optional replacer, and an optional
347 // space parameter, and returns a JSON text. The replacer can be a function
348 // that can replace values, or an array of strings that will select the keys.
349 // A default replacer method can be provided. Use of the space parameter can
350 // produce text that is more easily readable.
355 // If the space parameter is a number, make an indent string containing that
357 if (typeof space
=== 'number')
359 for (i
= 0; i
< space
; i
+= 1)
364 // If the space parameter is a string, it will be used as the indent string.
366 else if (typeof space
=== 'string')
371 // If there is a replacer, it must be a function or an array.
372 // Otherwise, throw an error.
374 if (replacer
&& typeof replacer
!== 'function' && (typeof replacer
!== 'object' || typeof replacer
.length
!== 'number'))
376 throw new Error('JSON.stringify');
379 // Make a fake root object containing our value under the key of ''.
380 // Return the result of stringifying the value.
388 // If the JSON object does not yet have a parse method, give it one.
389 if (typeof JSON
.parse
!== 'function')
391 JSON
.parse = function(text
, reviver
)
394 // The parse method takes a text and an optional reviver function, and returns
395 // a JavaScript value if the text is a valid JSON text.
398 function walk(holder
, key
)
401 // The walk method is used to recursively walk the resulting structure so
402 // that modifications can be made.
403 var k
, v
, value
= holder
[key
];
404 if (value
&& typeof value
=== 'object')
408 if (Object
.prototype.hasOwnProperty
.call(value
, k
))
422 return reviver
.call(holder
, key
, value
);
426 // Parsing happens in four stages. In the first stage, we replace certain
427 // Unicode characters with escape sequences. JavaScript handles many characters
428 // incorrectly, either silently deleting them, or treating them as line endings.
433 text
= text
.replace(cx
, function(a
)
435 return '\\u' + ('0000' + a
.charCodeAt(0).toString(16)).slice(-4);
439 // In the second stage, we run the text against regular expressions that look
440 // for non-JSON patterns. We are especially concerned with '()' and 'new'
441 // because they can cause invocation, and '=' because it can cause mutation.
442 // But just to be safe, we want to reject all unexpected forms.
443 // We split the second stage into 4 regexp operations in order to work around
444 // crippling inefficiencies in IE's and Safari's regexp engines. First we
445 // replace the JSON backslash pairs with '@' (a non-JSON character). Second, we
446 // replace all simple value tokens with ']' characters. Third, we delete all
447 // open brackets that follow a colon or comma or that begin the text. Finally,
448 // we look to see that the remaining characters are only whitespace or ']' or
449 // ',' or ':' or '{' or '}'. If that is so, then the text is safe for eval.
450 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, '')))
453 // In the third stage we use the eval function to compile the text into a
454 // JavaScript structure. The '{' operator is subject to a syntactic ambiguity
455 // in JavaScript: it can begin a block or an object literal. We wrap the text
456 // in parens to eliminate the ambiguity.
457 j
= eval('(' + text
+ ')');
459 // In the optional fourth stage, we recursively walk the new structure, passing
460 // each name/value pair to a reviver function for possible transformation.
461 return typeof reviver
=== 'function' ? walk(
467 // If the text is not JSON parseable, then a SyntaxError is thrown.
468 throw new SyntaxError('JSON.parse');
473 module
.exports
= JSON
;