Documentation of JSON expression representation

[kubaPod]

value — The new value of the variable in JSON expression representation (see below).

There's nothing below that explains it.

Additionaly setDynamicModuleVariables works with value : "True" which means there's more to say than 'it is ExpressionJSON' because representation of True is "true".

Please make this clear.

[kubaPod]

Temporary notes before documentation is updated.

• When the value is a string then it will be sent to the server for interpretation as in InputForm input.

• Otherwise the client side parser is used.
  value: something translates to ImportString["something", "ExpressionJSON"]

The latter method is preferred.

[poeschko]

Small correction: When the value is a string, it is parsed by the client-side parser. That parser has some limitations, and that's why the latter form (proper ExpressionJSON) is preferred.

The value is only sent to the server if it is used in an evaluation that cannot be handled by the client-side evaluator.

We will clarify this in the docs.

[kubaPod]

That is even better!

[poeschko]

This has been clarified on https://reference.wolfram.com/language/WolframNotebookEmbedder/docs/NotebookAPI/#expressionjson