Clojure base64 encoding

Question

I want something as simple as "string" -> base64. With the older base64.encode-str it was easy (and sounded "more clojure", but the newer clojure.data.codec.base64 requires input and output streams and seems an ugly wrapper around Java way of doing things.

So, what is the way, having a string, to get a base64 encoded array? Thanks

Answer 1

Four years later, but I think this is worth mentioning if you're at JDK 1.8 or greater. It just uses java.util.Base64

To Encode String -> Base64:

(:import java.util.Base64)  (defn encode [to-encode]   (.encode (Base64/getEncoder) (.getBytes to-encode))) 

To Encode String -> Base64 (String):

(:import java.util.Base64)  (defn encode [to-encode]   (.encodeToString (Base64/getEncoder) (.getBytes to-encode))) 

To Decode Base64 (byte[] or String) -> String:

(:import java.util.Base64)  (defn decode [to-decode]   (String. (.decode (Base64/getDecoder) to-decode))) 

Answer 2

There's one more step needed for the other answer: converting the byte-array result of encode into a string. Here's what I do:

(:require [clojure.data.codec.base64 :as b64])  (defn string-to-base64-string [original]   (String. (b64/encode (.getBytes original)) "UTF-8")) 

Answer 3

You can use encode function and pass array of bytes:

(encode (.getBytes "Hello world!"))

Answer 4

ztellman/byte-transforms also support base64 encode/decode.

(encode "hello" :base64 {:url-safe? true})