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Open Source
PassGuardJS
An open-source JavaScript and TypeScript password strength and password policy validation library.
| Category | Open Source |
|---|---|
| Technologies | TypeScript, JavaScript, npm |
| Links | source |
Overview
PassGuardJS is a small, dependency-light library for validating password strength and enforcing password policies in JavaScript and TypeScript applications — on both the client and the server.
Problem
Most applications either roll their own ad-hoc password rules or pull in heavyweight scoring libraries. Policy requirements (length, character classes, deny-lists) and strength estimation usually end up scattered and inconsistent between frontend and backend.
Solution
One library that expresses password policy as configuration and returns structured validation results, so the same policy runs identically in the browser and on the server.
Key features
- Configurable policy rules: length, character classes, repetition, deny-lists
- Strength scoring with human-readable feedback
- TypeScript-first API with full typings
- Zero runtime dependencies
Lessons learned
Security libraries earn adoption through good defaults — most users will never change the configuration, so the defaults are the policy.
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