Swift how to express JSON in structs - json

Question

I want to express the following JSON and convert to swift structs
1) I get error in the third line full_plan "comma is missing". I don't know why a comma is required? I need help fixing it
2) If that is fixed will the structs shown below is accurate to convert to JSON?
Please note: add_ons may be missing in the JSON for some plans, so second plan shown does not have add_ons.
Basically I am asking help to fix the JSON and the struct for swift.
{
"id": "100",
"plans":
[
"full_plan":
{
"plan":
[
{ "plan_type": "Legacy" },
{ "contract_duration_months": "12" }
],
"add_ons" :
[
{ "parking": "yes"},
{ "washerDryer": "no" }
]
},
"full_plan":
{
"plan":
[
{ "plan_type": "New" },
{ "contract_duration_months": "0" }
]
}
]
}
struct TopPlan : Decodable {
var uniqueId: String?
var Plans: [FullPlan]?
enum CodingKeys : String, CodingKey {
case uniqueId = "id"
case Plans = "plans"
}
}
struct FullPlan: Decodable {
var Plan: PlanJSON?
var freePlan: AddOnsJSON?
enum CodingKeys : String, CodingKey {
case pricedPlan = "plan"
case freePlan = "add_ons"
}
}
struct PlanJSON: Decodable {
var planType: String?
var duration: String?
enum CodingKeys : String, CodingKey {
case planType = "plan_type"
case duration = "contract_duration_months"
}
}
struct AddOnsJSON: Decodable {
var parking: String?
var washerDryer: String?
enum CodingKeys : String, CodingKey {
case parking = "parking"
case washerDryer = "washerDryer"
}
}

Answer 1

Short answer: your current JSON is invalid syntax.
You are using "full_plan" as a key (which would be fine if "plans" was an object) inside an array. Arrays in JavaScript (and thus in JSON) are unkeyed. You should either remove "full_plan" and just use the object that it refers to like "plans": [{}, {}, etc], or if you need to keep the object key wrap the entire item in curly braces such as "plans": [{ "full_plan": {}}, { "full_plan": {}}, etc]

Answer 2

You should build this up from the bottom (and if you post your question in a form that is executable in a Playground you will get answers faster). As it stands your plan JSON is unfortunate. Your struct states that you want a hash and you provide it with an array of hashes (which should be merged to get what you want). Try it like this:
import Cocoa
let jsonData = """
{ "plan_type": "Legacy",
"contract_duration_months": "12"
}
""".data(using: .utf8)!
struct PlanJSON: Decodable {
var planType: String?
var duration: String?
enum CodingKeys : String, CodingKey {
case planType = "plan_type"
case duration = "contract_duration_months"
}
}
do {
let plan = try JSONDecoder().decode(PlanJSON.self, from: jsonData)
print(plan)
} catch {
print(error)
}
That way you will be given enough information to further fix your JSON, but the rest looks ok.