fastest-validator

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This information can help attackers to find valid patterns that cause problems or find a way to bypass validations. Too risky

Why only regex pattern causes this problem?

{ type: "string", min: 3, max: 6, alpha: true }

Same as

{ type: "string", pattern: ^/[a-zA-Z]{3,6}$/ }

If it's a problem, would be better a validator option to disable expect values, like errorExpectedValue: false

validator option to disable expect values, like errorExpectedValue: false

Like it, It's a good way

If it's a problem...

In general, it's not. but people may carelessly use unsafe patterns from web