If you run a car marketplace, classifieds site or dealer tool, the VIN field is your best defense against bad listings, but only if you validate it properly. A check-digit test alone isn't enough. Here's a layered checklist, from cheap input checks to cross-checking the listing.
Source: [Dev.to](https://dev.to/vin_lookup_8dbd4710f77e9e/a-vin-validation-checklist-for-car-marketplace-developers-4mmi)