Price lists collect a lot of small numbers. Once a list has a few dozen rows it gets hard to spot the entry that drops a price below zero, the tier ladder that goes the wrong way, or the duplicate row that sneaks in after a paste. Validators are the plugin's answer: small pieces of code that watch every write and flag problems before they reach production.
A validator looks at the proposed final state of a price list - the list plus every entry that would exist after the current write - and reports findings. Some findings are blocking (the write is rejected, the transaction rolls back, nothing is saved). Others are advisory: warnings show up in the dashboard so an admin can see them and decide what to do. The plugin ships eight built-in validators. You can disable them, replace them, or write your own.
This page is part of the Vendure Platform documentation. Access requires a valid Vendure Platform license.