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How to read JSON with Swift?

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How to read JSON with Swift?

I have looked at a lot of places but I cannot adapt to my case

  • The JSON information is in an URL. For instance: https://www.example.com
  • It is nested. For instance: {"eur":{"usd":80}}
  • There is nothing else, there is not a list of values to iterate

1      

Any of the hundreds of Codable tutorials available on the web should work for this with some adaptation for your specific case.

But the basic idea is this:

import Foundation

struct Rate: Decodable {
    struct USConversion: Decodable {
        let usd: Int
    }

    let eur: USConversion
}

//for purposes of demonstration only
//in your app, you would get this from an API call
let moneyConversion = """
{"eur": {"usd": 80}}
""".data(using: .utf8)!

let jsonDecoder = JSONDecoder()
do {
    let money = try jsonDecoder.decode(Rate.self, from: moneyConversion)
    print(money)
} catch {
    print(error)
}

1      

Thank you!

1      

I can recommend https://quicktype.io to get an initial struct going that can receive your data.

2      

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