How Do I Serialize Objects to JSON in jQuery?

Serializing to JSON in jQuery

To serialize an object to JSON in jQuery, you have several options. One popular approach is to use JSON-js, a library that supports JSON functionality in JavaScript.

To convert an object to a JSON string using JSON-js, employ the JSON.stringify() method, as seen below:

var json_text = JSON.stringify(your_object, null, 2);

Subsequently, to parse a JSON string and restore it to an object, leverage the JSON.parse() method:

var your_object = JSON.parse(json_text);

Browser-Native JSON

Alternatively, most modern browsers provide native support for the JSON object. In this scenario, the JSON.stringify() and JSON.parse() methods are readily available without the need for an external library.

Recommendation

According to John Resig, it's advisable to migrate your JSON applications to Crockford's json2.js library. This ensures compatibility with the ECMAScript 5 specification while gracefully degrading when a faster native implementation is available. jQuery also utilizes the JSON.parse() method when present, indicating the wide adoption of native JSON support.

Example with Your Array

To convert your array of countries to a JSON string using the native JSON object:

var countries = ['ga', 'cd'];
var json_countries = JSON.stringify(countries);

When passing this string to $.ajax(), it should be structured as follows:

$.ajax({
  type: "POST",
  url: "Concessions.aspx/GetConcessions",
  data: '{"countries":' + json_countries + '}',
  ...
});

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