2
2
.
.
1
1
0
0
D
D
T
T
O
O
-
-
S
S
e
e
r
r
i
i
a
a
l
l
i
i
z
z
e
e
I
I
n
n
f
f
o
o
Following
tutorials sho
w how to
Serial
ize DTO - convert
it int
o JSON for the
purpose of
returning
i
t
back to Front
end.
