When Parsing JSON in jQuery: Single Quotes or Double Quotes?

JSON Single Quote vs. Double Quote in jQuery.parseJSON

In jQuery, when parsing JSON data using jQuery.parseJSON, the use of single quotes or double quotes for enclosing the JSON string can lead to different outcomes. Let's understand why.

Double Quotes

jQuery.parseJSON expects the JSON string to be enclosed in double quotes as per the JSON specification. When double quotes are used, like in the following code:

var obj1 = jQuery.parseJSON('{"orderedList": "true"}');

the JSON string is parsed successfully and the object properties can be accessed as expected:

document.write("obj1 " + obj1.orderedList);

Single Quotes

However, when the JSON string is enclosed in single quotes:

var obj2 = jQuery.parseJSON("{'orderedList': 'true'}");

the parsing fails and an error is thrown. This is because single quotes are not recognized as valid syntax for JSON strings.

JSON Standard

The difference between single quotes and double quotes is not specific to jQuery but is a fundamental aspect of the JSON specification. JSON requires double quotes for string literals, ensuring consistency and compatibility across different JSON libraries and frameworks.

Conclusion

When using jQuery.parseJSON to parse JSON data, it is essential to adhere to the JSON specification and enclose the JSON string in double quotes. Failure to do so will result in parsing errors and potentially unexpected behavior in your application.

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