Uses variable-length encoding. Inefficient for encoding negative numbers – if your field is likely to have negative values, use sint32 instead.
int32
int
int
int32
int
integer
Bignum or Fixnum (as required)
int64
Uses variable-length encoding. Inefficient for encoding negative numbers – if your field is likely to have negative values, use sint64 instead.
int64
long
int/long
int64
long
integer/string
Bignum
uint32
Uses variable-length encoding.
uint32
int
int/long
uint32
uint
integer
Bignum or Fixnum (as required)
uint64
Uses variable-length encoding.
uint64
long
int/long
uint64
ulong
integer/string
Bignum or Fixnum (as required)
sint32
Uses variable-length encoding. Signed int value. These more efficiently encode negative numbers than regular int32s.
int32
int
int
int32
int
integer
Bignum or Fixnum (as required)
sint64
Uses variable-length encoding. Signed int value. These more efficiently encode negative numbers than regular int64s.
int64
long
int/long
int64
long
integer/string
Bignum
fixed32
Always four bytes. More efficient than uint32 if values are often greater than 2^28.
uint32
int
int
uint32
uint
integer
Bignum or Fixnum (as required)
fixed64
Always eight bytes. More efficient than uint64 if values are often greater than 2^56.
uint64
long
int/long
uint64
ulong
integer/string
Bignum
sfixed32
Always four bytes.
int32
int
int
int32
int
integer
Bignum or Fixnum (as required)
sfixed64
Always eight bytes.
int64
long
int/long
int64
long
integer/string
Bignum
bool
bool
boolean
boolean
bool
bool
boolean
TrueClass/FalseClass
string
A string must always contain UTF-8 encoded or 7-bit ASCII text.
string
String
str/unicode
string
string
string
String (UTF-8)
bytes
May contain any arbitrary sequence of bytes.
string
ByteString
str
[]byte
ByteString
string
String (ASCII-8BIT)
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