PasswordStrength Plugin

Evaluates password strength on a 0–4 scale and validates against a minimum score threshold.

Score Algorithm

Score	Criteria met
0	None (empty or very short)
1	Length ≥ 8
2	+ Uppercase letter
3	+ Digit
4	+ Special character

Each criterion adds 1 point. A password with all four criteria scores 4.

Options

Option	Type	Default	Description
field	string	(required)	The field name to evaluate
message	string	'The password is not strong enough'	Error message when score is below minScore
minScore	number	3	Minimum required score (0–4)
onScore	function	undefined	Called after each evaluation: ({ field, score, valid }) => void

Playground

Type a password and click Validate to see the strength score. The indicator below the field updates in real time via the onScore callback.

Notes

• Adds a strength validator to the specified field at plugin install time — the field must already exist in fields.
• Score is computed each time the field is validated (not on every keystroke unless Trigger is configured).
• Use onScore with the Trigger plugin (event: 'input') for live feedback as the user types.
• Two PasswordStrength instances on different fields are fully independent.
• Removing the plugin (via deregisterPlugin) removes the strength validator from the field.