Use typed keys

dictionary_key.swift

// instead doing this
let dict: Dictionary<String, Any> = [:]
dict["name"] = "Marcin"

// do this if it's closed set
enum Keys: String, CaseIterable {
    case name, address
}

// or this if it's open set
struct Keys: Hashable, RawRepresentable {
    let rawValue: String
    init?(rawValue: String) {
        self.rawValue = rawValue
    }
    
    static let name = Keys(rawValue: "name")!
    static let address = Keys(rawValue: "address")!
}

extension Encodable where Self == Keys {
    func encode(to encoder: Encoder) throws {
        var container = encoder.singleValueContainer()
        try container.encode(self.rawValue)
    }
}

// and you're safer
var dict: Dictionary<Keys, Any> = [:]
dict[.name] = "Marcin"