Encoding in C# and Decoding in Javascript

Question

I have encoded some text in C# like below:

var encodedCredential = Convert.ToBase64String(Encoding.Unicode.GetBytes(JsonConvert.SerializeObject("Sample text")));

The encoded String is :IgBTAGEAbQBwAGwAZQAgAHQAZQB4AHQAIgA=

I want to decode the encoded String in java script.

I have tried the below

decodeURIComponent(atob("IgBTAGEAbQBwAGwAZQAgAHQAZQB4AHQAIgA="))
decodeURIComponent(atob("IgBTAGEAbQBwAGwAZQAgAHQAZQB4AHQAIgA=").replace(' ',''))

The result is something different, There are some spaces in each letter. I cant even replace the spaces.

Just to be clear: base64 encoding/decoding is not encryption - there is no key involved, so anyone can "decrypt" this data. — vcsjones, May 25 '17 at 16:18
Possible duplicate of [Using Javascript's atob to decode base64 doesn't properly decode utf-8 strings](https://stackoverflow.com/questions/30106476/using-javascripts-atob-to-decode-base64-doesnt-properly-decode-utf-8-strings) — Samvel Petrosov, May 25 '17 at 16:20
It is because you encoded a Unicode string. Try encoding it as an ASCII string instead (or UTF-8). — Robert McKee, May 25 '17 at 16:22

score 3 · Accepted Answer · answered May 25 '17 at 16:21

3

You need to use UTF-8 encoding in C#. Export base64 by this command

Convert.ToBase64String(Encoding.UTF8.GetBytes("Sample text"))

answered May 25 '17 at 16:21

Misaz

score 0 · Answer 2 · answered May 25 '17 at 16:25

0

@King_Fisher, you shouldn't be getting additional spaces, also the replace method will replace a single occurrence.

Here's what I did with your code (see attached screenshot)

answered May 25 '17 at 16:25

Asim Mittal

2 Answers2