Check if a value is a business identifier code

Test the shape of an 8- or 11-character BIC (SWIFT) code.

JavaScript Version 1.0.0 · MIT · .md

function isBic(value) { return /^[a-zA-Z]{6}[a-zA-Z0-9]{2}([a-zA-Z0-9]{3})?$/.test(value); }

Input & expected output

"DEUTDEFF"

true

The edge case

"DEUT1EFF"

false

Know the limits

• This checks the ISO 9362 format only — not that the institution or country code exists.

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.