FetchAndDecode.swift

// A URLSession extension that fetches data from a URL and decodes to some Decodable type.
// Usage: let user = try await URLSession.shared.decode(UserData.self, from: someURL)
// Note: this requires Swift 5.5.
extension URLSession {
    func decode<T: Decodable>(
        _ type: T.Type = T.self,
        from url: URL,
        keyDecodingStrategy: JSONDecoder.KeyDecodingStrategy = .useDefaultKeys,
        dataDecodingStrategy: JSONDecoder.DataDecodingStrategy = .deferredToData,
        dateDecodingStrategy: JSONDecoder.DateDecodingStrategy = .deferredToDate
    ) async throws  -> T {
        let (data, _) = try await data(from: url)

        let decoder = JSONDecoder()
        decoder.keyDecodingStrategy = keyDecodingStrategy
        decoder.dataDecodingStrategy = dataDecodingStrategy
        decoder.dateDecodingStrategy = dateDecodingStrategy

        let decoded = try decoder.decode(T.self, from: data)
        return decoded
    }
}

Note: in an earlier revision I made the return value T? rather than T, which was a mistake. This is corrected in the latest revision.

Updated with a default value for T for folks who prefer to use type annotation – thanks @prtmshk!

Thanks for sharing 🥳 By the way, the indentation seems off