Hi Paul, There are several issues here. NeoJSON cannot know that OrderPreservingDictionary is in fact a Dictionary, since it inherits from Collection. For that to work you have to add copy over the method neoJsonOn: neoJSONWriter neoJSONWriter writeMap: self This will work for encoding, but when decoding you will get back normal Dictionaries (or the #mapClass that you set on your reader). JSON does not encode types. Also, there are various implementations of ordered Dictionary out there in the wild. From Pharo 4 we have OrderedDictionary. NeoJSON cannot support them all, hence it supports none ;-) STON does solve this problem. Sven

On 28 May 2015, at 09:55, Paul Wilke <wilke@itsys24.de> wrote:

Hi, there is a bug when converting OrderPreservingDictionary's into a json string.

NeoJSONWriter toString: (OrderPreservingDictionary new at: 'key' put: 'value'; yourself). -->["value"]

In Pharo 2 the answer was as expected: {"key":"value"}

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