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Here are the falsy values: false null undefined The empty string '' The number 0 The number NaN All other values are truthy, including true, the string 'false', and all objects.
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Douglas Crockford (JavaScript: The Good Parts: The Good Parts)
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Note that the JSON format doesn’t work with methods (so you can’t include, say, a bark method in your JSON string), but it does work with all the primitive types, as well as objects and arrays.
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Eric Freeman (Head First JavaScript Programming: A Brain-Friendly Guide)
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The JSON returned by Twitter’s API includes tweet IDs twice, once as a JSON number and once as a decimal string, to work around the fact that the numbers are not correctly parsed by JavaScript applications
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Martin Kleppmann (Designing Data-Intensive Applications: The Big Ideas Behind Reliable, Scalable, and Maintainable Systems)