Dackson is a loose port Java's Jackson library for serializing and deserializing JSON data into user-defined data structures.

Dackson is published on the DUB package registry.

To deserialize a datatype, you must first define it! Dackson will work with any mutable struct, though you can add additional JsonProperty annotations if the D field name differs from the actual field name.

import dackson;

struct User {
  @JsonProperty("user_id") long userId;
  string username;
}

Then use the decodeJson function to decode the JSON (in string form) into a D type.

string json = `{"user_id": 1234, "username": "John Smith"}`;
User u = decodeJson!(User)(json);  // User(1234, "John Smith")

Or use unified function call syntax:

string json = `{"user_id": 1234, "username": "John Smith"}`;
User u = json.decodeJson!User;  // User(1234, "John Smith")

Encode using the encodeJson function. The JsonProperty annotations will be respected.

import dackson;

struct User {
  @JsonProperty("user_id") long userId;
  string username;
}

string encoded = encodeJson(User(1234, "John Smith")); // {"user_id":1234,"username":"John Smith"}

• Support for classes and immutable structures.
• @JsonIgnore annotations
• Special behavior for missing/null values