Ask questionsadd custom validation message to IsDate, isAlpha, Is ,.....
@IsDate(msg:"please enter a valid date")
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You can see this is implemented for some validators but not all of them: https://github.com/RobinBuschmann/sequelize-typescript/blob/master/src/validation/length.ts
You would basically just need to copy this to every validator in this folder, it wouldn't be a massive lift.