• String values are mapped to Prolog strings
• JSON true, false and null are represented using these Prolog atoms.
• JSON objects are mapped to dicts.
• Optionally, a type field in an object assigns a tag for the dict.

The predicate json_read_dict/3 processes the same options as json_read/3, but with different defaults. In addition, it processes the tag option. See json_read/3 for details about the shared options.

tag(+Name)

When converting to/from a dict, map the indicated JSON attribute to the dict tag. No mapping is performed if Name is the empty atom (” , default). See json_read_dict/2 and json_write_dict/2.

default_tag(+Tag)

Provide the default tag if the above tag option does not apply.

null(+NullTerm)

Default the atom null.

true(+TrueTerm)

Default the atom true.

false(+FalseTerm)

Default the atom false

end_of_file(+ErrorOrTerm)

Action on reading end-of-file. See json_read/3 for details.

value_string_as(+Type)

Prolog type used for strings used as value. Default is string. The alternative is atom, producing a packed string object.