base64

Checks that the value is a Base64 string (RFC 4648).

Error codes: WRONG_BASE64, FORMAT_ERROR

Live example · edit rules or inputOpen in playground

rules

{
    file: 'base64',
    token: { base64: 'url' }
}

{
    file: 'base64',
    token: { base64: 'url' }
}

input

{
    file: 'aGVsbG8=',
    token: 'aGVsbG8+'
}

{
    file: 'aGVsbG8=',
    token: 'aGVsbG8+'
}

Invaliderrors

{
  "token": "WRONG_BASE64"
}

'base64': the standard alphabet A-Za-z0-9+/, the length is a multiple of 4, and the padding = or == may appear only at the end.
{ base64: 'url' }: the URL-safe alphabet A-Za-z0-9-_, and the padding is optional. Either there is no = and the length modulo 4 is 2, 3 or 0, or the padding is complete and the length is a multiple of 4. Partial padding fails: 'SA=' gives WRONG_BASE64, while 'SA' and 'SA==' pass.

No whitespace or line breaks are allowed. The unused bits of the last character are not checked.

There is no option for the standard alphabet without padding ('relaxed' in js-livr-extra-rules). An options object may add it later.

base64 ​