uint32_t

       MongoDB, Inc

       2009-present, MongoDB, Inc.

1.30.4                                            Jun 08, 2025                              BSON_ITER_KEY_LEN(3)

       Fetches  the  length  of  the  key  for  the  current  element  observed by iter. This is a constant time
       computation, and therefore faster than calling strlen() on a key returned by bson_iter_key().

       • iter: A bson_iter_t.

       An integer representing the key length.

       SEEALSO:bson_iter_key() to retrieve current key.

          uint32_t
          bson_iter_key_len (const bson_iter_t *iter);