JSON

@derive(Json)

Auto-generate JSON serialization and deserialization:

@derive(Json)
class User {
    var name: String
    var age: Int
    var active: Bool
}

fun main() {
    let user = User { name: "Alice", age: 30, active: true }
    let json = user.toJson()
    println(json)
    // {"name":"Alice","age":30,"active":true}
}

JSON Type Constants

import core.json_derive

Constant	Value	Description
JSON_NULL	0	Null value
JSON_BOOL	1	Boolean
JSON_INT	2	Integer
JSON_FLOAT	3	Float
JSON_STRING	4	String
JSON_ARRAY	5	Array
JSON_OBJECT	6	Object

JSON Module

import json

JSONValue

The JSONValue class represents any JSON value.

JSON Parser

Parse JSON strings:

import json.parser

let value = parseJson(jsonString)

JSON Builder

Build JSON programmatically:

import json.builder

Runtime JSON Functions

Function	Description
seen_json_parse(str)	Parse JSON string
seen_json_stringify(val)	Serialize to JSON string
seen_json_get_type(val)	Get value type
seen_json_get_int(val)	Extract integer
seen_json_get_float(val)	Extract float
seen_json_get_string(val)	Extract string
seen_json_get_bool(val)	Extract boolean
seen_json_array_length(val)	Get array length
seen_json_array_get(val, idx)	Get array element
seen_json_object_get(val, key)	Get object field

Example

@derive(Json)
class Config {
    var host: String
    var port: Int
    var debug: Bool
    var tags: Array<String>
}

fun main() {
    let config = Config {
        host: "localhost",
        port: 8080,
        debug: false,
        tags: ["web", "api"]
    }

    let json = config.toJson()
    println(json)
    // {"host":"localhost","port":8080,"debug":false,"tags":["web","api"]}
}