Decode arrays where items can fail: https://magnuskahr.dk/2019/05/28/decode-array-where-items-can-fail.html

failableDecoableExample.swift

import Foundation

// We provide some json and transform it to Data-type
let json = """
[{
	"name": "John",
	"startingTime": 581167640.06502903
}, {
	"name": "Mark",
	"startingTime": 582031640.06502903
}, {
	"name": "Tobias"
}]
""".data(using: .utf8)!

// The struct we wonna decode to, it needs to be `Codable`
struct Participant: Codable {
	let name: String
	let startingTime: Date
}

// The wrapper type
struct FailableDecodable<T: Decodable>: Decodable {
	
	let value: T?
	
	init(from decoder: Decoder) throws {
		let container = try decoder.singleValueContainer()
		self.value = try? container.decode(T.self)
	}
}

// Lets decode!
let decoder = JSONDecoder()
let wrapped = try! decoder.decode([FailableDecodable<Participant>].self, from: json)

// Using compactMap() we can filter out every `nil` values
let participants = wrapped.compactMap {$0.value}

print(participants)