Have I Been Pwned

The Have I Been Pwned plugin helps protect user accounts by preventing the use of passwords that have been exposed in known data breaches. It uses the Have I Been Pwned API to check if a password has been compromised.

Installation

Add the plugin to your auth config

import { betterAuth } from "better-auth"
import { haveIBeenPwned } from "better-auth/plugins"

export const auth = betterAuth({
    plugins: [
        haveIBeenPwned()
    ]
})

Usage

When a user attempts to create an account or update their password with a compromised password, they'll receive the following default error:

{
  "code": "PASSWORD_COMPROMISED",
  "message": "Password is compromised"
}

Config

You can customize the error message:

haveIBeenPwned({
    customPasswordCompromisedMessage: "Please choose a more secure password."
})

Security Notes

• Only the first 5 characters of the password hash are sent to the API
• The full password is never transmitted
• Provides an additional layer of account security