Check if a value is base32 encoded

Test the RFC 4648 base32 alphabet and a length that is a multiple of 8.

JavaScript Version 1.0.0 · MIT · .md

function isBase32(value) { return value.length % 8 === 0 && /^[A-Z2-7]+=*$/.test(value); }

Input & expected output

"MZXW6==="

true

The edge case

"mzxw6==="

false

Know the limits

• Uppercase alphabet only; the amount of padding is not verified.

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

• Check whether all values are equal — Compare every item with the first using Object.is.
• Check whether an object is empty — Check for own enumerable string keys on a JSON object.
• Check whether an integer is even — Test parity for safe integers, including zero and negative values.