Zig Requires Chilkat v11.0.0+

Modify Parts of JSON Document

See more JSON Examples

Demonstrates how to modify parts of a JSON document. This example uses the following JSON document:

{
   "fruit": [
      	{
         "kind": "apple",
	 "count": 24,
	 "fresh": true,
	 "extraInfo": null,
	 "listA": [ "abc", 1, null, false ],
	 "objectB": { "animal" : "monkey" }
      	},
	{
         "kind": "pear",
	 "count": 18,
	 "fresh": false,
	 "extraInfo": null
	 "listA": [ "xyz", 24, null, true ],
	 "objectB": { "animal" : "lemur" }
	}
    ],
    "list" : [ "banana", 12, true, null, "orange", 12.5, { "ticker": "AAPL" }, [ 1, 2, 3, 4, 5 ] ],
    "alien" : true
}

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();

    // Load the JSON from a file.
    json.loadFile("qa_data/json/modifySample.json") catch {
        std.debug.print("{s}\n", .{try json.getLastErrorText(alloc)});
        return;
    };

    // This example will not check for errors (i.e. null / false / 0 return values)...

    // Get the "list" array:

    const list_a = try chilkat.JsonArray.init();
    defer list_a.deinit();

    json.arrayOf2("list", list_a) catch {};

    // Modify values in the list.

    // Change banana to plantain
    try list_a.setStringAt(0, "plantain");

    // Change 12 to 24
    try list_a.setIntAt(1, 24);

    // Change true to false
    try list_a.setBoolAt(2, false);

    // Is the 3rd item null?
    _ = list_a.isNullAt(3);

    // Change "orange" to 32.
    try list_a.setIntAt(4, 32);

    // Change 12.5 to 31.2
    try list_a.setNumberAt(5, "31.2");

    // Replace the { "ticker" : "AAPL" } object with { "ticker" : "GOOG" }
    // Do this by deleting, then inserting a new object at the same location.
    try list_a.deleteAt(6);
    const ticker_obj = try chilkat.JsonObject.init();
    defer ticker_obj.deinit();
    list_a.addObjectAt2(6, ticker_obj) catch {};

    try ticker_obj.appendString("ticker", "GOOG");

    // Replace "[ 1, 2, 3, 4, 5 ]" with "[ "apple", 22, true, null, 1080.25 ]"
    try list_a.deleteAt(7);
    const aa = try chilkat.JsonArray.init();
    defer aa.deinit();
    list_a.addArrayAt2(7, aa) catch {};

    try aa.addStringAt(-1, "apple");
    try aa.addIntAt(-1, 22);
    try aa.addBoolAt(-1, true);
    try aa.addNullAt(-1);
    try aa.addNumberAt(-1, "1080.25");

    // Get the "fruit" array
    const a_fruit = try chilkat.JsonArray.init();
    defer a_fruit.deinit();
    json.arrayAt2(0, a_fruit) catch {};

    // Get the 1st element:
    const apple_obj = try chilkat.JsonObject.init();
    defer apple_obj.deinit();
    a_fruit.objectAt2(0, apple_obj) catch {};

    // Modify values by member name:
    try apple_obj.setStringOf("fruit", "fuji_apple");
    try apple_obj.setIntOf("count", 46);
    try apple_obj.setBoolOf("fresh", false);
    try apple_obj.setStringOf("extraInfo", "developed by growers at the Tohoku Research Station in Fujisaki");

    // Modify values by index:

    const pear_obj = try chilkat.JsonObject.init();
    defer pear_obj.deinit();
    a_fruit.objectAt2(1, pear_obj) catch {};

    try pear_obj.setStringAt(0, "bartlett_pear");
    try pear_obj.setIntAt(1, 12);
    try pear_obj.setBoolAt(2, false);
    try pear_obj.setStringAt(3, "harvested in late August to early September");

    json.setEmitCompact(false);
    std.debug.print("{s}\n", .{try json.emit(alloc)});
}