Is the order of elements in a JSON list preserved?

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Yes, the order of elements in JSON arrays is preserved. From RFC 7159 -The JavaScript Object Notation (JSON) Data Interchange Format
 (emphasis mine):

An object is an unordered collection of zero or more name/value
pairs, where a name is a string and a value is a string, number,
boolean, null, object, or array.

An array is an ordered sequence of zero or more values.

The terms “object” and “array” come from the conventions of
JavaScript.

Some implementations do also preserve the order of JSON objects as well, but this is not guaranteed.

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