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Laravel ChainRule

A chainable validation rule builder for Laravel.
Simplifies writing complex validation rules by chaining methods together in a fluent, readable API .

Features

• Chain simple rules : required(), nullable(), email(), string(), integer(), etc.
• Chain parameterized rules : between(), after(), etc.
• Conditional rules :
  • addIfTrue($condition, $rule) – adds the rule if the condition is true
  • addIfFalse($condition, $rule) – adds the rule if the condition is false
  • addIfNull($value, $rule) – adds the rule if the value is null
  • addIfNotNull($value, $rule) – adds the rule if the value is not null
  • addIfEmpty($value, $rule) – adds the rule if the value is empty (null, [], '', 0, false, or empty object)
  • addIfNotEmpty($value, $rule) – adds the rule if the value is not empty
  • addWhen(callable $callback, $rule) – adds the rule if the callback returns true
• Security helpers:
  • stripTags(array $allowedHtmlTags) – validates that the field contains only the given safe tags (all others are rejected).
  • sanitizeXss(array $allowedHtmlTags) – blocks malicious content like <script>, onerror=, javascript: links, and alert() while allowing safe tags.
• Automatic deduplication of rules to prevent duplicates when chaining or merging.
• Returns rules as array (toArray()) or string (toString()).

Installation

Install via Composer:

Usage in Form Requests

Conditional Example

Using ChainRule with Arrays and ChainRule Objects

Preventing XSS / Unsafe HTML

You can allow only safe HTML while rejecting scripts and malicious attributes:

Or allow only specific tags:

Helper Method

For convenience, you can use the global chainRule() helper instead of ChainRule::make():

Mass Method

LICENSE

The MIT License (MIT). Please see License File for more information.