Add validator for ISMN

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Assessment

Difficulty
2/5
Estimated time
1-3 hours
Newbie friendliness
68/100
Issue type
Feature
Clarity
Mostly clear
Activity status
Quiet
Tech stack
javascript
Domain
backend

Research direction

Read the ISMN specification at the linked Library of Congress page, then compare existing identifier validators and their tests in validator.js to find the relevant entry points. Add the ISMN validation behavior and matching test coverage; done means valid and invalid ISMN strings are distinguished consistently with the documented format.

Written by the indexing model from the issue text.

Description

Add new validation for ISMN

https://www.loc.gov/ismn/about.html

Dominant language
JavaScript
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Forks
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  4. Open a pull request that references the issue number.

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