Convert a base64 encoded string to an Uint8Array

Decode base64 into its byte values.

JavaScript Version 1.0.0 · MIT · .md

function base64ToBytes(base64) { return Array.from(atob(base64), char => char.charCodeAt(0)); }

Input & expected output

"SGVsbG8="

[
  72,
  101,
  108,
  108,
  111
]

The edge case

""

[]

Know the limits

• Returns plain numbers so the lab can show them; wrap the result with Uint8Array.from in your code.
• Oveyon’s /v1/send takes attachment content as base64 (up to 20 attachments, 15 MB in total); decode only what you need to inspect.

The function above is the implementation used by the lab. The lab validates JSON types and caps size before execution; include equivalent validation when accepting untrusted input in your application.

Keep exploring

• Capitalize a string — Uppercase the first Unicode code point and preserve the remaining text.
• Reverse a string — Reverse Unicode code points without splitting surrogate pairs.
• Check a palindrome — Compare a string with its code-point reversal.