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https://issues.apache.org/jira/browse/SLING-9455?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17111089#comment-17111089
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Robert Munteanu commented on SLING-9455:
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Thanks for raising this issue [~yumeier]. I agree on the need to do this, even
if I don't know right now what the best solution is :-)
I think that
https://github.com/apache/sling-org-apache-sling-servlets-get/blob/06d8e1d45c073c35b65adfcd30ed49eb6c592dfa/src/main/java/org/apache/sling/servlets/get/impl/helpers/JsonRenderer.java
covers most of your use case, except for negative list of properties, right?
Of course, the problem is that it's not API, but I think it's a good starting
point.
[~bdelacretaz] - IIUC the use cases are different. While you want to convert
arbitrary objects, Juerg is looking to convert nodes or resources.
> JsonItemWriter
> --------------
>
> Key: SLING-9455
> URL: https://issues.apache.org/jira/browse/SLING-9455
> Project: Sling
> Issue Type: New Feature
> Components: Commons
> Affects Versions: Commons JSON 2.0.18
> Environment: Sling Starter
> Reporter: Juerg Meier
> Priority: Major
>
> Sling 8 came with an org.apache.sling.commons.json bundle/package. The .jcr
> sub-package contained two classes:
> * JsonItemWriter
> * JsonJcrNode
> (javadoc
> [here|https://sling.apache.org/apidocs/sling8/org/apache/sling/commons/json/jcr/package-summary.html)
> These two classes allowed for serializing a sling resource to well formated
> JSON and a JCR node to an org.apache.sling.commons.json.JSONObject,
> respectively.
> For legal reasons, this package was discontinued and is not present anymore
> in later versions, including the current Sling 11 version.
> Consequently, Sling 11 lacks of a simple yet application-controllable way to
> serialize a Resource directly to a JSON string. However, many API calls, used
> in particular by client-side Javascript frameworks (e.g. for Single Page
> Apps), rely heavily on JSON.
> Hence, it would be desirable to have the Sling 8 JSON package (or similar)
> back in Sling. The following functionality should be present to have a
> flexible JSON generator available within Sling:
> * direct conversion of Nodes/Resources to a String containing JSON
> * application control of node recursion levels (child nodes as JSON objects)
> * should allow to set a negative list of properties (those not to render in
> the output)
> * proper rendering of all JCR property types to JSON including
> ** date format definition (default = ISO8601)
> ** multi-values support (as JSON arrays)
> ** proper escaping of special chars in Strings
> * adding additional string/value pairs by the application (i.e. not
> originating from the dumped Resource)
> See also thread on the sling-users mailing list starting 12 May
> 2020/"Resource to json serializing"
>
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