{"id":4935,"date":"2023-03-29T22:20:00","date_gmt":"2023-03-30T03:20:00","guid":{"rendered":"https:\/\/www.incredigeek.com\/home\/?p=4935"},"modified":"2023-03-31T22:15:44","modified_gmt":"2023-04-01T03:15:44","slug":"decoding-base64-atob-in-javascript-nodejs","status":"publish","type":"post","link":"https:\/\/www.incredigeek.com\/home\/decoding-base64-atob-in-javascript-nodejs\/","title":{"rendered":"Decoding base64 “atob” in Javascript NodeJS"},"content":{"rendered":"\n

atob() is a javascript function that decodes base64 encoded text. btoa() is the encoding function. We can use NodeJS to dedcode atob() functions. For instance, we can lanch nodejs woth<\/p>\n\n\n\n

nodejs<\/pre>\n\n\n\n
and decode the sting SGVsbG8gV29ybGQgIQ==<\/p>\n\n\n\n
console.log(atob(\"SGVsbG8gV29ybGQgIQ==\"));<\/pre>\n\n\n\n
If we wanted to break that down into a couple variables we can do something like the following.<\/p>\n\n\n\n
> var b64 = atob(\"SGVsbG8gV29ybGQgIQ==\")\n> console.log(b64\");<\/pre>\n\n\n\n
<\/p>\n\n\n\n
<\/p>\n\n\n\n
\"\"<\/a><\/figure>\n\n\n\n
<\/p>\n\n\n\n
You can also create a javascript file and then run the file with nodejs.<\/p>\n\n\n\n
var b64 = atob(atob(\"U0dWc2JHOGdWMjl5YkdRZ0lRPT0=\"))\n\nconsole.log(b64);<\/pre>\n\n\n\n
We can then run the file with <\/p>\n\n\n\n
nodejs .\/file.js<\/pre>\n\n\n\n
In the file the string “Hello World !” is double encoded so we process it twice with the “atob(atob(base64);” <\/p>\n\n\n\n
There is more info available at the following links<\/p>\n\n\n\n
https:\/\/www.npmjs.com\/package\/atob<\/a>
https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/API\/atob<\/a><\/p>\n\n\n\n
Check out the following article if you want to use Python to decode base64.<\/p>\n\n\n\n
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Decode base64 in python<\/a><\/blockquote>