Rust

Loading and Parsing a JSON Array

See more JSON Examples

A JSON array is JSON that begins with "[" and ends with "]". For example, this is a JSON array that contains 3 JSON objects.

[{"name":"jack"},{"name":"john"},{"name":"joe"}]

A JSON object, however, is JSON that begins with "{" and ends with "}". For example, this JSON is an object that contains an array.

{"pets":[{"name":"jack"},{"name":"john"},{"name":"joe"}]}

This example shows how loading a JSON array is different than loading a JSON object. Rust

let str_json_array = "[{\"name\":\"jack\"},{\"name\":\"john\"},{\"name\":\"joe\"}]".to_string();

let str_json_object = "{\"pets\":[{\"name\":\"jack\"},{\"name\":\"john\"},{\"name\":\"joe\"}]}".to_string();

// A JSON array must be loaded using JsonArray:
let json_array = chilkat::JsonArray::new();
let _ = json_array.load(&str_json_array);

// Examine the values:
let mut i = 0;
while i < json_array.size() {
    let json_obj = json_array.object_at(i).unwrap();
    println!("{}: {}", i, json_obj.string_of("name").unwrap_or_default());

    i = i + 1;
}

// Output is:

// 	0: jack
// 	1: john
// 	2: joe

// A JSON object must be loaded using JsonObject
let json_object = chilkat::JsonObject::new();
let _ = json_object.load(&str_json_object);

// Examine the values:
i = 0;
let num_pets = json_object.size_of_array("pets");
while i < num_pets {
    json_object.set_i(i);
    println!("{}: {}", i, json_object.string_of("pets[i].name").unwrap_or_default());
    i = i + 1;
}

// Output is:

// 	0: jack
// 	1: john
// 	2: joe