Zig

JSON: Nested Objects

See more JSON Examples

Here we have a JSON object that contains nested JSON objects. This example demonstrates how to access the contents of the nested objects.

{
  "name": "donut",
  "image":
    {
    "fname": "donut.jpg",
    "w": 200,
    "h": 200
    },
  "thumbnail":
    {
    "fname": "donutThumb.jpg",
    "w": 32,
    "h": 32
    }
}

Zig

const std = @import("std");
const chilkat = @import("chilkat");

pub fn main(init: std.process.Init) !void {
    const alloc = init.arena.allocator();

    const json = try chilkat.JsonObject.init();
    defer json.deinit();

    // This is the above JSON with whitespace chars removed (SPACE, TAB, CR, and LF chars).
    // The presence of whitespace chars for pretty-printing makes no difference to the Load
    // method.
    const json_str = "{\"name\": \"donut\",\"image\":{\"fname\": \"donut.jpg\",\"w\": 200,\"h\": 200},\"thumbnail\":{\"fname\": \"donutThumb.jpg\",\"w\": 32,\"h\": 32}}";

    json.load(json_str) catch {
        std.debug.print("{s}\n", .{try json.getLastErrorText(alloc)});
        return;
    };

    // Get the "image" object.
    const image_obj = try chilkat.JsonObject.init();
    defer image_obj.deinit();
    json.objectOf2("image", image_obj) catch {};

    std.debug.print("image: fname={s}, width={d}, height={d}\n", .{ try image_obj.stringOf(alloc, "fname"), image_obj.intOf("w"), image_obj.intOf("h") });

    // Get the "thumbnail" object.
    const thumb_obj = try chilkat.JsonObject.init();
    defer thumb_obj.deinit();
    json.objectOf2("thumbnail", thumb_obj) catch {};

    std.debug.print("thumbnail: fname={s}, width={d}, height={d}\n", .{ try thumb_obj.stringOf(alloc, "fname"), thumb_obj.intOf("w"), thumb_obj.intOf("h") });
}