Smart, type-safe, zero-regex validation middleware for Node.js backends. Supports Fastify and Express out-of-the-box. Provides standard rules for email, password, name, phone, and more. Built for backend developers to avoid repetitive validation logic.
Smart Auth Validator is a type-safe, zero-regex authentication and form validation library for Fastify and Express. It provides a standardized, reusable validation system for backend forms like registration, login, and profile updates without writing repetitive regex or validation logic.
- Type-safe validation with TypeScript
- Supports Fastify and Express out of the box
- Standard rules for common fields:
email,password,name,phone, etc. - Returns structured errors for each field
- Minimal and lightweight
- Easy to extend with custom rules
bash npm install smart-auth-validator
Supported Fields The library currently supports a wide array of built-in validation rules. You can validate these fields by simply passing their keys:
Category: Supported Fields Identity "name, username, email, password" Contact "phone, url" Address "street, city, state, postalCode" Finance "creditCard, cvv" General "date, time, active (boolean)"
Simple Usage To use Smart Auth Validator, simply define a schema with the fields you want to validate and pass your input data to the validate function.
Basic 3-Field Example
Even though the library supports 10+ fields, you can choose only the ones you need:
Error Response Format
If validation fails, you get a clean array explaining exactly what went wrong:
REQUIRED: Field is missing.
PATTERN: Invalid format (e.g., bad email).
MIN_LENGTH: Input is too short.
WEAK_PASSWORD: Password doesn't meet security standards.
