issn
Validates an ISSN (International Standard Serial Number) used to identify periodicals.
Options
| Option | Type | Default | Description |
|---|---|---|---|
message | string | locale default | Custom error message |
Playground
Valid values
| Value | Notes |
|---|---|
"0028-0836" | Nature journal ISSN |
"1476-4687" | Nature online ISSN |
Invalid values
| Value | Reason |
|---|---|
"0028-0837" | Wrong check digit |
"12345678" | Missing hyphen |
Notes
- Empty string (
"") always returnsvalid: true. Combine withnotEmptyto require a value. - Format: 4 digits, hyphen, 3 digits, check character (digit or
X):NNNN-NNNC.