JavaScript – Serializing Objects

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Object serialization is the process of
converting an object’s state to a string from which it can later be
restored. ECMAScript 5 provides native functions JSON.stringify() and JSON.parse() to serialize and restore
JavaScript objects. These functions use the JSON data interchange
format. JSON stands for “JavaScript Object Notation,” and its syntax
is very similar to that of JavaScript object and array

o = {x:1, y:{z:[false,null,""]}}; // Define a test object
s = JSON.stringify(o);            // s is '{"x":1,"y":{"z":[false,null,""]}}'
p = JSON.parse(s);                // p is a deep copy of o

The native implementation of these functions in ECMAScript 5 was
modeled very closely after the public-domain ECMAScript 3
implementation available at For practical purposes, the
implementations are the same, and you can use these ECMAScript 5
functions in ECMAScript 3 with this json2.js module.

JSON syntax is a subset of JavaScript
syntax, and it cannot represent all JavaScript values. Objects,
arrays, strings, finite numbers, true, false, and null are supported and can be serialized and
restored. NaN, Infinity, and -Infinity are serialized to null. Date objects are serialized to
ISO-formatted date strings (see the Date.toJSON() function), but JSON.parse() leaves these in string form and
does not restore the original Date object. Function, RegExp, and Error
objects and the undefined value
cannot be serialized or restored. JSON.stringify() serializes only the
enumerable own properties of an object. If a property value cannot be
serialized, that property is simply omitted from the stringified
output. Both JSON.stringify() and
JSON.parse() accept optional second
arguments that can be used to customize the serialization and/or
restoration process by specifying a list of properties to be
serialized, for example, or by converting certain values during the
serialization or stringification process. Complete documentation for
these functions is in the reference section.

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