fromJSON

Extract a value from a json object by its key.

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

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

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.
options JsonizeOptions: configures the deserialization behavior.

Examples

Directly extract values from an object by their keys.

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

Deserialize an instance of a user-defined type from a json object.

import jsonizer.jsonize;

static struct Foo {
  mixin JsonizeMe;
  @jsonize int i;
  @jsonize string[] a;
}

auto foo = `{"i": 12, "a": [ "a", "b" ]}`.parseJSON.fromJSON!Foo;
assert(foo == Foo(12, [ "a", "b" ]));

Meta

Source

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jsonizer fromjson functions