Get JSON representation of any plain internal table

itab_to_json.abap

*&---------------------------------------------------------------------*
*&      Form  ITAB_TO_JSON
*&---------------------------------------------------------------------*
*       Get JSON representation of any plain internal table
*----------------------------------------------------------------------*
FORM itab_to_json USING    it_abap TYPE STANDARD TABLE
                  CHANGING et_json TYPE string.

  DATA : lo_object_info    TYPE REF TO cl_abap_structdescr
       , lw_attribute_info TYPE        abap_compdescr.

  DATA : lv_attributes TYPE string
       , lv_objects    TYPE string

       , lv_first_attribute TYPE abap_bool
       , lv_first_object    TYPE abap_bool.

  FIELD-SYMBOLS : <fs_object>    TYPE ANY
                , <fs_attribute> TYPE ANY.

  lv_first_object = abap_true.

  LOOP AT it_abap ASSIGNING <fs_object>.
    lo_object_info ?= cl_abap_typedescr=>describe_by_data( <fs_object> ).

    lv_first_attribute = abap_true.

    LOOP AT lo_object_info->components INTO lw_attribute_info.
      ASSIGN
        COMPONENT     lw_attribute_info-name
        OF STRUCTURE <fs_object>
        TO           <fs_attribute>.

      IF lv_first_attribute = abap_false.
        CONCATENATE lv_attributes `, ` INTO lv_attributes.
      ELSE.
        lv_first_attribute = abap_false.
      ENDIF.

      CONCATENATE      lv_attributes
                  `"`  lw_attribute_info-name `" : `
                  `"` <fs_attribute>          `"`
             INTO lv_attributes.

    ENDLOOP.

    IF lv_first_object = abap_false.
      CONCATENATE lv_objects `, ` INTO lv_objects.
    ELSE.
      lv_first_object = abap_false.
    ENDIF.

    CONCATENATE lv_objects ` { ` lv_attributes ` } `
           INTO lv_objects.

    CLEAR : lv_attributes.

  ENDLOOP.

  CONCATENATE `[` lv_objects `]` INTO et_json.

ENDFORM.                    "itab_to_json