Thank you Sven. I check those example. very helpfull.

But I use this method toJson to convert the stream to json and I get :

PrimitiveFailed: primitive #basicNew: in ByteString class failed

toJson
^ String streamContents: [ :stream |
	(NeoJSONWriter on: stream)
	for: Date
	customDo: [ :mapping | mapping encoder: [ :value | value asDateAndTime printString  ] ];
	nextPut: data ]

Did you see some errors.

Did you read https://ci.inria.fr/pharo-contribution/job/EnterprisePharoBook/lastSuccessfulBuild/artifact/book-result/NeoJSON/NeoJSON.html ?

Did you check out the unit tests ? Some of them serve as examples. Checkout NeoJSONTestObject1 2 3 and the tests #testObject1 2 3 for example. 

On 19 Nov 2016, at 08:24, Asbath Sama biyalou via Pharo-users <pharo-users@lists.pharo.org> wrote:


From: Asbath Sama biyalou <asamabiyalou@yahoo.com>
Subject: NeoJSON with Rest
Date: 19 November 2016 at 08:24:13 GMT+1
To: Pharo users users <pharo-users@lists.pharo.org>


Hello.

I want an example of implementation of neojson on a pharo object.

I am trying to implement neoJsonOn: method on a pharo object but when I
test I get a Character mapping not found

in NeoJSONWriter.

Thanks.