UrlSafe

The "base64url" encoding specified by RFC 4648 section 5, Base 64 Encoding with URL and Filename Safe Alphabet.

Uses "The URL and Filename safe Base 64 Alphabet" as specified in Table 2 of RFC 4648 for encoding and decoding, consisting of 'A'..'Z', 'a'..'z', '-' and '_' characters.

This instance is configured with the padding option set to PaddingOption.PRESENT. Use the withPadding function to create a new instance with a different padding option if necessary.

Encode operation does not add any line separator character. Decode operation throws if it encounters a character outside the base64url alphabet.

Samples

import kotlin.io.encoding.*
import kotlin.test.*

fun main() { 
   //sampleStart 
   val encoded = Base64.UrlSafe.encode("Hello? :> ".encodeToByteArray())
println(encoded) // SGVsbG8_IDo-IA== 
   //sampleEnd
}