Shecker

Library for Typescript and Javascript to validate single values, simple objects & complex objects according a set of defined rules. It's highly inspired by Laravel framework Validations: https://laravel.com/docs/9.x/validation

⚠️ This library is still in experimental stage. Be careful while using it.

⚠️ This library is not intended to validate phone numbers or addresses formats.

Installation

$ npm install shecker

Usage

Shecker allows you to validate if a value meets your requirements based on a set of rules you defined:

// validate() function returns an array of error objects
const {validate} = require('shecker');

const errors = validate('hello world', 'string|max:10');

if(errors.length > 0) { // Check if exists errors
    console.log(errors);
    /**
     * [
     *   {'hello world': 'Invalid size -> max:10'}
     * ]
     */
}

As you can see above, each rule attached to a value is separated by pipes (|)

You can also validate simple objects like:

// validateObject() function returns an array of error objects
const {validateObject} = require('shecker');

const person = {
    name: 'Alex Black',
    email: 'alex@black.com',
    age: 'twentyFour',
    hasChildren: 'no'
}
const rules = {
    name: 'required',
    email: 'ifExists|email',
    age: 'required|number',
    hasChildren: 'required|boolean'
}

const errors = validateObject(human, rules);

console.log(errors);
/**
 * [
 *   {'age': 'Invalid type. Required: number'},
 *   {'hasChildren': 'Invalid type. Required: boolean'}
 * ]
 */

And check for nested objects too!

const {validateObject} = require('shecker');

const vehicle = {
    wheelsCount: 4,
    engine: {
        horsepower: 420,
        fuel: {
            type: 'gasoline',
            consumption: 25.4
        }
    }
    ...
}
const rules = {
    'engine': 'required|object',
    'engine.horsepower': 'number',
    'engine.fuel.type': 'string',
    'engine.fuel.consumption': 'number',
}

const errors = validateObject(vehicle, rules);

// No errors
console.log(errors); // []

API

Methods

Name	Description
validate	Allows check a single value with a set of rules
validateObject	Allows check each attribute of an object and nested attributes with a set of rules

Rules

Name	Description
required	Specifies the value needs to exist
ifExists	If the value exists, apply the further rules
string	The value has to be a String
email	The value has to be a valid email format
number	The value has to be a Number
boolean	The value has to be: 1, 0, true or false
date	The value has to be an instance of Date
onlydate:{format}	The value has to be a string and has the right format and be a valid date.
array	The value has to be an Array
object	the value has to be an Object
min:{n}	For strings or arrays: The minimum length has to be n. For numbers, the value has to be equal or greater than n
max:{n}	For strings or arrays: The maximum length has to be n. For numbers, the value has to be equal or lower than n
size:{n}	Apply just for strings and arrays. The length has to be the same as n
equals:{n}	Apply just for numbers. The value has to be the same as n

Quick note: The possible formats for the rule onlydate are:

• mm-dd-yyyy or mm/dd/yyyy
• dd-mm-yyyy or dd/mm/yyyy
• yyyy-mm-dd or yyyy/mm/dd

Example:

validate('Hello world!', 'required|string|min:3,max:15');
/** 
 * required: Verify the value is not empty, null or undefined
 * string: The value has to be a string
 * min:3:  The value needs to have at least of 3 chars
 * max:15 the value needs to have maximum 15 chars
 */