bool

       MongoDB, Inc

       2009-present, MongoDB, Inc.

1.30.4                                            Jun 08, 2025                                 BSON_HAS_FIELD(3)

       Checks  to  see  if  key  contains  an  element  named  key.  This also accepts "dotkey" notation such as
       "a.b.c.d".

       • bson: A bson_t.

       • key: A string containing the name of the field to check for.

       true if key was found within bson; otherwise false.

          bool
          bson_has_field (const bson_t *bson, const char *key);