Open Cloud represents request and response payloads as standard JSON. The standards JSON types are text, values, objects, arrays, numbers, and strings. Some types have special considerations for representing specific kinds of data, which are described in the following sections.


Uses RFC 3339, where generated output will always be Z-normalized and uses 0, 3, 6 or 9 fractional digits. Offsets other than "Z" are also accepted.

Example Timestamp

{ "timestamp": "1972-01-01T10:00:20.021Z" }


Generated output always contains 0, 3, 6, or 9 fractional digits, depending on required precision, followed by the suffix "s". Accepted are any fractional digits (also none) as long as they fit into nano-seconds precision and the suffix "s" is required.

Example Durations

"duration-9": "1.000340012s",
"duration-0": "1s"


Byte data are encoded as a string using standard base64 encoding with paddings. Either standard or URL-safe base64 encoding with or without paddings are supported.

Example Bytes

"bytes": "YWJjMTIzIT8kKiYoKSctRbLx+"


A FieldMask is a string that describes the fields to act on when making a request. To construct a field mask, you specify comma delimited JSON field names in a string. For example, given the following resource:

Example JSON resource

"foo": {
"a": "c",
"b": "d"
"bar": "x",
"baz": "y"

If you wanted to specify a field mask to update the values of only foo.b and bar, the field mask would look like: foo.b, bar

In Open Cloud, update methods that support a field mask have a parameter named updateMask, where you can specify a field mask as a value.