$ show validatorjs/validator.js
This repository is a comprehensive string validation and sanitization library for Node.js and browser environments. It provides a large collection of validator functions (e.g., isEmail, isURL, isMobilePhone, isCreditCard) and sanitizers (e.g., trim, escape, whitelist). The library is designed as a set of small, self-contained modules under src/lib/, each exporting a single function. The main entry point is src/index.js, which aggregates all validators and sanitizers into a single export. The library has no runtime dependencies and can be used both server-side and client-side (via a UMD bundle). It includes extensive locale-specific data for phone numbers, postal codes, tax IDs, etc., making it suitable for international validation. The architecture follows a consistent pattern: each validator imports assertString for type checking and optionally merge for options handling, then performs validation using regex or algorithmic checks. The library is actively maintained with frequent releases and a formal security threat model.
The LLM identified 4 files worth highlighting for reuse:
Implements several checksum algorithms (Luhn, ISO 7064, Verhoeff) used by validators like isCreditCard, isLuhnNumber, and isTaxID. These are self-contained, pure functions that can be extracted and reused in any project requiring checksum validation.
A simple utility that ensures the input is a string, throwing a TypeError otherwise. It is used by almost every validator and sanitizer. Its simplicity and clear contract make it a reusable pattern for input validation in any JavaScript library.
A deep merge function for combining default options with user-supplied options. It handles nested objects and arrays. This is a common utility pattern that can be extracted and used in any project requiring configuration merging.
A comprehensive security threat model document that defines the library's security boundaries, threat scenarios, controls, and severity methodology. It serves as a reusable template for documenting security properties of open-source libraries, including scope, trust boundaries, and finding disposition categories.