SAP ABAP ASJSON ABAP TYPES

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asJSON - Mapping of ABAP Data Types
Named data objects other than reference variables are represented in asJON as the content of the following object components: 'bn1':...
'bn1':...
...
An additional object is implemented for the objects referenced by reference variables: '%heap':...
Depending on the ABAP data type, serializations map the value of named data objects to a particular JSON representation; deserializations operate in the opposite direction:

Mapping of Elementary ABAP Types

Mapping of Structures

Mapping of Internal Tables

Mapping of Reference Variables and Referenced Objects