Decode Base64 string

Question

I am currently working on a custom SAPUI5 app. I would like to make a service call, which expects the Guid in a different format than it is currently available.

An example:

Available (base64): QvLAUUzUCZbhAAAAjSS2iA==
As it should be (hexadecimal): 42F2C0514CD40996E10000008D24B688

I have not found an online decoder, which could produce the desired result, however, I was able to encode the guid 42F2C0514CD40996E10000008D24B to QvLAUUzUCZbhAAAAjss2iA== with the SAP ABAP standard function module HTTP_BASE64_ENCODE. With the usual online encoders, however, I got a different result.

How can I decode the encoded guid with JavaScript so that it has the desired format?

atob("QvLAUUzUCZbhAAAAjSS2iA==").replace(/[^]/g, c => c.charCodeAt(0).toString(16)) — Thomas
– Thomas, Commented May 29, 2019 at 12:42
Hi Thomas. Thank you for the answer, this looks already quite good! There is only something wrong with zeros. Your function returns "42f2c0514cd4996e10008d24b688" and it should be "42F2C0514CD40996E10000008D24B688". I marked the missing ones bold. It seems like they get lost... — C. Ubkcah
– C. Ubkcah, Commented May 29, 2019 at 13:21
And could you please tell me something about the meaning of the regex and charCodeAt? Thank you! — C. Ubkcah
– C. Ubkcah, Commented May 29, 2019 at 13:39
The regex is replacing all characters for its hexadecimal representation. — filipe
– filipe, Commented May 29, 2019 at 14:01
Possible duplicate of Decode Base64 to Hexadecimal string with javascript — Jordan Running
– Jordan Running, Commented May 30, 2019 at 17:58

filipe · Accepted Answer · 2019-05-29 14:12:54Z

1

The string is in hexadecimal format you will have to convert it.

First you convert the string to binary (atob > charCodeAt) and then using the toString(16) you get the hex.

I will not post the code, since its already explained Decode Base64 to Hexadecimal string with javascript

edited May 29, 2019 at 14:12

answered May 29, 2019 at 14:06

filipe

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