https://github.com/krzyzanowskim/JSONCodable

JSONCodable.swift

import Foundation

protocol JSONEncodable: Encodable { }

extension JSONEncodable {
  func toJSON() throws -> String? {
    try String(data: JSONEncoder().encode(self), encoding: .utf8)
  }
}

protocol JSONDecodable: Decodable { }

extension JSONDecodable {
  static func from(json data: Data) throws -> Self {
    try JSONDecoder().decode(Self.self, from: data)
  }
}

protocol JSONCodable: JSONEncodable & JSONDecodable { }

// Usage

struct Filter: JSONEncodable {
  let id: String
}

let jsonString = Filter(id: "foo").toJSON()