Decode base64 string in Swift [duplicate]

Question

I have following base64 encoded string:

eyJhbGciOiJSUzI1NiIsImtpZCI6IjdEODU3RjE3RjMwQTBBNzY4OUQ4RTFDMTI0RjRFMzk1MEU2REIyQ0YiLCJ0eXAiOiJKV1QiLCJ4NXQiOiJmWVZfRl9NS0NuYUoyT0hCSlBUamxRNXRzczgifQ

I easy decode it online, for example here

However when i try to decode it in swift i'm not succeed, i used:

func fromBase64() -> String? {
    guard let data = Data(base64Encoded: self) else {
      return nil
    }

    return String(data: data, encoding: .utf8)
  }

But i return nil.

Gereon · Accepted Answer · 2019-08-01 08:49:26Z

6

Your string is missing the = padding characters at the end of a base64 output to make the string length divisible by 4. Try with

eyJhbGciOiJSUzI1NiIsImtpZCI6IjdEODU3RjE3RjMwQTBBNzY4OUQ4RTFDMTI0RjRFMzk1MEU2REIyQ0YiLCJ0eXAiOiJKV1QiLCJ4NXQiOiJmWVZfRl9NS0NuYUoyT0hCSlBUamxRNXRzczgifQ==

edited Aug 1, 2019 at 8:49

answered Aug 1, 2019 at 8:39

Gereon

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2 Comments

Desdenova Over a year ago

that usually occur at the end.. This is a bit misleading. Since his encoded string isn't divisible by 4, he needs 2 == to make it correct.

Gereon Over a year ago

You're right, I've update my answer

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