Szathmáry László honlapja @ DEIK | DLang / Create a JSON object

(1) create JSON

import std.stdio;
import std.json;

void main()
{
// Method 1: Using parseJSON (often easier)
JSONValue person1 = parseJSON(`{
"name": "John",
"age": 30,
"isStudent": false,
"hobbies": ["reading", "gaming", "coding"]
}`);
writeln(person1); // person1.toString() is called automatically

// Method 2: Using JSONValue constructor functions
JSONValue person2 = [
"name": JSONValue("John"),
"age": JSONValue(30),
"isStudent": JSONValue(false),
"hobbies": JSONValue(["reading", "gaming", "coding"])
];
writeln(person2);
}

Output:

{"age":30,"hobbies":["reading","gaming","coding"],"isStudent":false,"name":"John"}
{"age":30,"hobbies":["reading","gaming","coding"],"isStudent":false,"name":"John"}

(2) write JSON to file

import std.stdio;
import std.json;

void main()
{
JSONValue person = [
"name": JSONValue("John"),
"age": JSONValue(30),
"isStudent": JSONValue(false),
"hobbies": JSONValue(["reading", "gaming", "coding"])
];
writeln(person);

File f = File("person.json", "w");
// v1
// f.writeln(person);
// v2
// f.writeln(person.toString());
// v3
f.writeln(person.toPrettyString());
f.close();
}

Output of v1 and v2 (they're equivalent):

{"age":30,"hobbies":["reading","gaming","coding"],"isStudent":false,"name":"John"}

Output of v3:

{
    "age": 30,
    "hobbies": [
        "reading",
        "gaming",
        "coding"
    ],
    "isStudent": false,
    "name": "John"
}

You could also write to a .json file with a one-liner:

File("person.json", "w").writeln(person);