Swift

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. Swift

func chilkatTest() {
    var strJsonArray: String? = "[{\"name\":\"jack\"},{\"name\":\"john\"},{\"name\":\"joe\"}]"

    var strJsonObject: String? = "{\"pets\":[{\"name\":\"jack\"},{\"name\":\"john\"},{\"name\":\"joe\"}]}"

    // A JSON array must be loaded using JsonArray:
    let jsonArray = CkoJsonArray()!
    jsonArray.load(jsonArray: strJsonArray)

    // Examine the values:
    var i: Int = 0
    while i < jsonArray.size.intValue {
        var jsonObj: CkoJsonObject? = jsonArray.object(at: i)
        print("\(i): \(jsonObj!.string(of: "name")!)")
        jsonObj = nil
        i = i + 1
    }

    // Output is:

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

    // A JSON object must be loaded using JsonObject
    let jsonObject = CkoJsonObject()!
    jsonObject.load(json: strJsonObject)

    // Examine the values:
    i = 0
    var numPets: Int = jsonObject.size(ofArray: "pets").intValue
    while i < numPets {
        jsonObject.i = i
        print("\(i): \(jsonObject.string(of: "pets[i].name")!)")
        i = i + 1
    }

    // Output is:

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

}