Install
npm install password-validator
Usage
var passwordValidator = require('password-validator');
var schema = new passwordValidator();
schema
.is().min(8)
.is().max(100)
.has().uppercase()
.has().lowercase()
.has().digits(2)
.has().not().spaces()
.is().not().oneOf(['Passw0rd', 'Password123']);
console.log(schema.validate('validPASS123'));
console.log(schema.validate('invalidPASS'));
console.log(schema.validate('joke', { list: true }));
Advanced usage
Details about failed validations
Sometimes just knowing that the password validation failed or what failed is not enough and it is important too get more context. In those cases, details
option can be used to get more details about what failed.
console.log(schema.validate('joke', { details: true }));
The above code will output:
[
{
validation: 'min',
arguments: 8,
message: 'The string should have a minimum length of 8 characters'
},
{
validation: 'uppercase',
message: 'The string should have a minimum of 1 uppercase letter'
},
{
validation: 'digits',
arguments: 2,
message: 'The string should have a minimum of 2 digits'
}
]
Custom validation messages
The validation messages can be overriden by providing a description of the validation. For example:
schema.not().uppercase(8, 'maximum 8 chars in CAPS please')
The above validation, on failure, should return the following object:
{
validation: 'min',
arguments: 8,
inverted: true,
message: 'maximum 8 chars in CAPS please'
},
Plugins
Plugin functions can be added to the password validator schema for custom password validation going beyond the rules provided here. For example:
var validator = require('validator');
var passwordValidator = require('password-validator');
var schema = new passwordValidator()
.min(3, 'Password too small')
.usingPlugin(validator.isEmail, 'Password should be an email');
schema.validate('not-an-email', { details: true })
Rules
Rules supported as of now are:
Rules | Descriptions |
---|
digits([count], [description]) | specifies password must include digits (optionally provide count paramenter to specify at least n digits) |
letters([count], [description]) | specifies password must include letters (optionally provide count paramenter to specify at least n letters) |
lowercase([count], [description]) | specifies password must include lowercase letters (optionally provide count paramenter to specify at least n lowercase letters) |
uppercase([count], [description]) | specifies password must include uppercase letters (optionally provide count paramenter to specify at least n uppercase letters) |
symbols([count], [description]) | specifies password must include symbols (optionally provide count paramenter to specify at least n symbols) |
spaces([count], [description]) | specifies password must include spaces (optionally provide count paramenter to specify at least n spaces) |
min(len, [description]) | specifies minimum length |
max(len, [description]) | specifies maximum length |
oneOf(list) | specifies the whitelisted values |
not([regex], [description]) | inverts the result of validations applied next |
is() | inverts the effect of not() |
has([regex], [description]) | inverts the effect of not() and applies a regex (optional) |
usingPlugin(fn, [description]) | Executes custom function and include its result in password validation |
Options
The following options can be passed to validate
method:
list
- If set, validate method returns a list of rules which failed instead of true/false.
Resources
For APIs of other older versions, head to Wiki.
License
MIT License