Basics

To parse existing JSON data - call zcl_ajson=>parse( lv_json_string )
To create a new empty JSON instance (to set values and serialize) - call zcl_ajson=>new( ) or new zcl_ajson( ) in newer ABAP syntax
You can clone an ajson instance to get a new independent copy with lo_orig_json->clone( )

General rules

All functional methods and types are defined in zif_ajson interface.
- Methods have aliases in the zcl_ajson class, however please restrain from using them directly as they may be deprecated in future.
JSON attributes are addressed by path in form /obj1/obj2/value of e.g. get( '/a/b/c' ) addresses { "a": { "b": { "c": "this value !" } } }. If an attribute contains slashes, for example in { "a/b/c": 10 }, you have to replace the slashes with tabs (\t) to access the value e.g., get( |/a\tb\tc| ).
Array items addressed with index starting from 1: /tab/2/val -> { "tab": [ {...}, { "val": "this value !" } ] }

Set (and some other) methods also return me to support chaining: li_json->set(...)->set(...)->touch_array(...)->push(...).

Mapping and formatting are enabled by interface zif_ajson_mapping. Predefined patterns for field mapping (ABAP ⇆ JSON), Camel Case, UPPER/lower case can be found in class zcl_ajson_mapping
Predefined filters are available in zcl_ajson_filter_lib class

  lo_new_json = zcl_ajson=>create_from(
    ii_source_json = lo_orig_json ).