First version of my validator for checking inputs.
Now support form and separately: email, password and string length validation.

Changelog
v. 0.1.1 - Change file structure.
v. 0.2.0 - Add form validation.
v. 0.3.0 - Add dynamic creating validation rules
v. 0.3.1 - Add min-max validation for number in input
v. 0.4.0 - config generator v. 0.5.0 - upload to NPM
v. 0.5.1 - change import

In progress:
v. 0.6 - refactoring with TS

• Change code to more declarative style
• Adding new features

How to use.
Create folders 'helpers/validator' in your project directory.
Copy code (./src and index.js) from this repository to your folder 'validator'.
Import stringValidator or formValidator from ('/helpers/validator').

Create your configuration like example below, then use Generator for creating config. Example:

// config.js
const Generator = require('...../src/Generator.js');

const myRules = {
  password: {
    maxLength: { value: 7, msg: 'Max 7' },
    minLength: { value: 1 },
    upperCase: { value: 3, msg: 'Min 3' }
  },
  email: {
    email: { value: 1 },
    localLength: { value: 64, msg: '64 no more' },
    minLength: { value: 1 },
    maxLength: { value: 256, msg: 'Max 256' }
  },
  price: {
    min: { value: 7 },
    max: { value: 999 }
  }
};

module.exports = Generator(myRules);

Currently you can use this params for validation:
upperCase:int - Minimal amount of upper-case letters in string
lowCase: int - Minimal amount of low-case letters in string
numbers: int, - Minimal amount of numbers in string
min: int, Minimal value of input's number
max: int, Max value of input's number
minLength: int, Minimal length of string
maxLength: int, Max length of string
email: int, Is str should be email (1 it true, either 0 )
localLength: int, Max length of email local part

And than use function stringValidator or formValidator.

stringValidator receive arguments:
str == value for validation :: string,
config == object with validation rules:: object,
type == rule which will be used for validation:: string
and return array.
Array can be empty if it has not errors during validation, or contain objects:
{status: boolean, msg: string, params: string}
Status indicate error, message take error message from your config, and params equal to rule value which didn't pass validation.

FormValidator receive arguments
( form == form :: object, config == object with validation rules:: object )
Form must have this structure:
{ruleName1: 'str', ruleName2: 'str', ...}
ruleName is a name of form filed which MUST be named same as a validation rule for it.
formValidator() return an array with this structure:

[
  { data: [[Object]], key: 'ruleName1' },
  { data: [[Object]], key: 'ruleName2' }
];

where [Object] is the same as result for stringValidator()