7
No warranty expressed or implied. Use at your own risk.
9
See http://www.JSON.org/js.html
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This file creates a global JSON object containing two methods:
13
JSON.stringify(value, whitelist)
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value any JavaScript value, usually an object or array.
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whitelist an optional array prameter that determines how object
17
values are stringified.
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This method produces a JSON text from a JavaScript value.
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There are three possible ways to stringify an object, depending
21
on the optional whitelist parameter.
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If an object has a toJSON method, then the toJSON() method will be
24
called. The value returned from the toJSON method will be
27
Otherwise, if the optional whitelist parameter is an array, then
28
the elements of the array will be used to select members of the
29
object for stringification.
31
Otherwise, if there is no whitelist parameter, then all of the
32
members of the object will be stringified.
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Values that do not have JSON representaions, such as undefined or
35
functions, will not be serialized. Such values in objects will be
36
dropped; in arrays will be replaced with null.
37
JSON.stringify(undefined) returns undefined. Dates will be
38
stringified as quoted ISO dates.
42
var text = JSON.stringify(['e', {pluribus: 'unum'}]);
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// text is '["e",{"pluribus":"unum"}]'
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JSON.parse(text, filter)
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This method parses a JSON text to produce an object or
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array. It can throw a SyntaxError exception.
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The optional filter parameter is a function that can filter and
50
transform the results. It receives each of the keys and values, and
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its return value is used instead of the original value. If it
52
returns what it received, then structure is not modified. If it
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returns undefined then the member is deleted.
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// Parse the text. If a key contains the string 'date' then
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// convert the value to a date.
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myData = JSON.parse(text, function (key, value) {
61
return key.indexOf('date') >= 0 ? new Date(value) : value;
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This is a reference implementation. You are free to copy, modify, or
67
Use your own copy. It is extremely unwise to load third party
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/*jslint evil: true */
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/*members "\b", "\t", "\n", "\f", "\r", "\"", JSON, "\\", apply,
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charCodeAt, floor, getUTCDate, getUTCFullYear, getUTCHours,
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getUTCMinutes, getUTCMonth, getUTCSeconds, hasOwnProperty, join, length,
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parse, propertyIsEnumerable, prototype, push, replace, stringify, test,
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function f(n) { // Format integers to have at least two digits.
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return n < 10 ? '0' + n : n;
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Date.prototype.toJSON = function () {
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// Eventually, this method will be based on the date.toISOString method.
94
return this.getUTCFullYear() + '-' +
95
f(this.getUTCMonth() + 1) + '-' +
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f(this.getUTCDate()) + 'T' +
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f(this.getUTCHours()) + ':' +
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f(this.getUTCMinutes()) + ':' +
99
f(this.getUTCSeconds()) + 'Z';
103
var m = { // table of character substitutions
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function stringify(value, whitelist) {
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var a, // The array holding the partial texts.
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i, // The loop counter.
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k, // The member key.
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r = /["\\\x00-\x1f\x7f-\x9f]/g,
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v; // The member value.
121
switch (typeof value) {
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// If the string contains no control characters, no quote characters, and no
125
// backslash characters, then we can safely slap some quotes around it.
126
// Otherwise we must also replace the offending characters with safe sequences.
128
return r.test(value) ?
129
'"' + value.replace(r, function (a) {
135
return '\\u00' + Math.floor(c / 16).toString(16) +
136
(c % 16).toString(16);
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// JSON numbers must be finite. Encode non-finite numbers as null.
144
return isFinite(value) ? String(value) : 'null';
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return String(value);
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// Due to a specification blunder in ECMAScript,
153
// typeof null is 'object', so watch out for that case.
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// If the object has a toJSON method, call it, and stringify the result.
161
if (typeof value.toJSON === 'function') {
162
return stringify(value.toJSON());
165
if (typeof value.length === 'number' &&
166
!(value.propertyIsEnumerable('length'))) {
168
// The object is an array. Stringify every element. Use null as a placeholder
169
// for non-JSON values.
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for (i = 0; i < l; i += 1) {
173
a.push(stringify(value[i], whitelist) || 'null');
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// Join all of the elements together and wrap them in brackets.
178
return '[' + a.join(',') + ']';
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// If a whitelist (array of keys) is provided, use it to select the components
185
l = whitelist.length;
186
for (i = 0; i < l; i += 1) {
188
if (typeof k === 'string') {
189
v = stringify(value[k], whitelist);
191
a.push(stringify(k) + ':' + v);
197
// Otherwise, iterate through all of the keys in the object.
200
if (typeof k === 'string') {
201
v = stringify(value[k], whitelist);
203
a.push(stringify(k) + ':' + v);
209
// Join all of the member texts together and wrap them in braces.
211
return '{' + a.join(',') + '}';
216
stringify: stringify,
217
parse: function (text, filter) {
220
function walk(k, v) {
222
if (v && typeof v === 'object') {
224
if (Object.prototype.hasOwnProperty.apply(v, [i])) {
226
if (n !== undefined) {
236
// Parsing happens in three stages. In the first stage, we run the text against
237
// regular expressions that look for non-JSON patterns. We are especially
238
// concerned with '()' and 'new' because they can cause invocation, and '='
239
// because it can cause mutation. But just to be safe, we want to reject all
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// We split the first stage into 4 regexp operations in order to work around
243
// crippling inefficiencies in IE's and Safari's regexp engines. First we
244
// replace all backslash pairs with '@' (a non-JSON character). Second, we
245
// replace all simple value tokens with ']' characters. Third, we delete all
246
// open brackets that follow a colon or comma or that begin the text. Finally,
247
// we look to see that the remaining characters are only whitespace or ']' or
248
// ',' or ':' or '{' or '}'. If that is so, then the text is safe for eval.
250
if (/^[\],:{}\s]*$/.test(text.replace(/\\./g, '@').
251
replace(/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(:?[eE][+\-]?\d+)?/g, ']').
252
replace(/(?:^|:|,)(?:\s*\[)+/g, ''))) {
254
// In the second stage we use the eval function to compile the text into a
255
// JavaScript structure. The '{' operator is subject to a syntactic ambiguity
256
// in JavaScript: it can begin a block or an object literal. We wrap the text
257
// in parens to eliminate the ambiguity.
259
j = eval('(' + text + ')');
261
// In the optional third stage, we recursively walk the new structure, passing
262
// each name/value pair to a filter function for possible transformation.
264
return typeof filter === 'function' ? walk('', j) : j;
267
// If the text is not JSON parseable, then a SyntaxError is thrown.
269
throw new SyntaxError('parseJSON');
added
removed
console/json2.js
