Serializing to JSON in JavaScript

[MarPlo]

I need to serialize an object to JSON in JavaScript. Is there a "standard" way to do this?
I have an array defined something like this:

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var countries = [];
countries[0] = 'ga';
countries[1] = 'cd';
...

And I need to convert this into a json string to pass to $.ajax() like this:

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$.ajax({
  type: "POST",
  url: "Concessions.aspx/GetConcessions",
  data: "{'countries': ['ga','cd']}",
...

Use the JSON object methods.
- To convert an object to a string, use JSON.stringify():

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

- To convert a JSON string to object, use JSON.parse():

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var your_object = JSON.parse(json_string);