fromJSON

Extract a value from a json object by its key.

Throws if json is not of JSONType.object. Return defaultVal if the key does not exist.

T fromJSON(JSONValue json, JsonizeOptions options)
T fromJSON(JSONValue json, string key, JsonizeOptions options)
T fromJSON(JSONValue json, string key, T defaultVal, JsonizeOptions options)
T
fromJSON
(
T
)
(
JSONValue json
,
string key
,
T defaultVal
,
in ref JsonizeOptions options = JsonizeOptions.defaults
)

Parameters

T: Target type. can be any primitive/builtin D type, or any user-defined type using the JsonizeMe mixin.
json JSONValue: JSONValue to deserialize.
key string: key of desired value within the object.
defaultVal T: value to return if key is not found
options JsonizeOptions: configures the deserialization behavior.

Examples

Substitute default values when keys aren't present.

auto aa = ["a": 1, "b": 2];
auto json = JSONValue(aa);
assert(json.fromJSON!int("a", 7) == 1);
assert(json.fromJSON!int("c", 7) == 7);

Meta

Source

See Implementation

jsonizer fromjson functions