Consumer Authentication

/

API reference

/

Passwords

/

Strength check

Strength check

POSThttps://test.stytch.com/v1/passwords/strength_check

This API allows you to check whether or not the user’s provided password is valid, and to provide feedback to the user on how to increase the strength of their password.

This endpoint adapts to your Project's password strength configuration. If you're using zxcvbn, the default, your passwords are considered valid if the strength score is >= 3. If you're using LUDS, your passwords are considered valid if they meet the requirements that you've set with Stytch. You may update your password strength configuration in the stytch dashboard.

Password feedback

The feedback object contains relevant fields for you to relay feedback to users that failed to create a strong enough password.

If you're using zxcvbn, the feedback object will contain warning and suggestions for any password that does not meet the zxcvbn strength requirements. You can return these strings directly to the user to help them craft a strong password.

If you're using LUDS, the feedback object will contain an object named luds_requirements which contain a collection of fields that the user failed or passed. You'll want to prompt the user to create a password that meets all of the requirements that they failed.

Body parameters

password* string
email string

Response fields

status_code int
request_id string
breach_detection_on_create boolean
breached_password boolean
feedback object
score int
strength_policy string
valid_password boolean
curl --request POST \
  --url https://test.stytch.com/v1/passwords/strength_check \
  -u 'PROJECT_ID:SECRET' \
  -H 'Content-Type: application/json' \
  -d '{
    "password": "$B&M)3$B$eCk_2@c"
  }'

RESPONSE

200 - LUDS invalid
{
	"breach_detection_on_create": true,
	"breached_password": false,
	"feedback": {
		"suggestions": null,
		"warning": null,
		"has_digit": true,
		"has_lower_case": false,
		"has_symbol": false,
		"has_upper_case": false,
		"missing_characters": 6,
		"missing_complexity": 1
	},
	"request_id": "request-id-test-b05c992f-ebdc-489d-a754-c7e70ba13141",
	"score": 0,
	"status_code": 200,
	"strength_policy": "luds",
	"valid_password": false
}

Common Error Types