JavaScript: Decode a string of data which has been encoded using base-64 encoding

JavaScript fundamental (ES6 Syntax): Exercise-259 with Solution

Decode Base-64 String

Write a JavaScript program to decode a string of data encoded using base-64 encoding.

Note: Create a Buffer for the given string with base-64 encoding and use Buffer.toString('binary') to return the decoded string.

• Create a Buffer for the given string with base-64 encoding and use Buffer.toString('binary') to return the decoded string.

Sample Solution:

JavaScript Code:

//#Source https://bit.ly/2neWfJ2 
// Define a function 'atob' that decodes a base64 encoded string
const atob = str => new Buffer(str, 'base64').toString('binary');

// Decode the base64 encoded string 'Zm9vYmFy'
console.log(atob('Zm9vYmFy')); 

Flowchart:

For more Practice: Solve these Related Problems:

• Write a JavaScript program that decodes a Base-64 encoded string using atob() in the browser.
• Write a JavaScript function that converts a Base-64 string to its original representation and logs the result.
• Write a JavaScript program that handles errors during Base-64 decoding and returns a fallback message.
• Write a JavaScript function that decodes a Base-64 encoded string and verifies the output against expected plain text.

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