Add Login Auth To Any Project

    by Mariusz Wrzeszczynski

    1

    Automatically add login authentication to existing apps.

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    Works with the AI tools you already use

    CClaude CodeCCursorCCodex CLIGGitHub CopilotGGemini CLIVVS CodeWWindsurfMManus+14 more

    See it in action

    You say

    Add JWT-based login and registration to my Express app. Use bcrypt for passwords and create a middleware to protect the /dashboard route.

    Your agent does

    Project Detected: Express (Node.js) Auth Feature Added: JWT Login, Registration, Auth Middleware Security Changes: Bcrypt hashing, Environment-based secrets Files Modified: src/routes/auth.js, src/middleware/auth.js, .env.example Commands Executed: npm install jsonwebtoken bcrypt Validation: Success

    What you get

    Implement secure password hashing using bcrypt or argon2.Generate auth middleware to protect private API endpoints.Scaffold user registration and login routes for any framework.Update environment templates with necessary authentication keys.

    About this skill

    The problem

    Manually implementing secure authentication is error-prone and repetitive. Developers often waste time boilerplate-ing routes, middleware, and hashing logic while risking common security pitfalls like hardcoded secrets or weak hashing.

    What it does

    • Detects your framework and project structure to ensure auth logic fits your existing codebase.
    • Generates secure login and registration routes with input validation and password hashing.
    • Implements auth middleware to protect routes using sessions or JWTs based on your stack.
    • Updates .env.example with required variables and creates necessary database schemas or models.
    • Runs validation commands and provides specific instructions or curl commands to test the new flow.

    Frameworks & tools

    Framework-agnostic but follows project-specific conventions. Works with libraries like bcrypt, argon2, and established session or JWT packages.

    Why this beats prompting it yourself

    Generic prompts often produce insecure code with hardcoded secrets or custom crypto. This skill enforces strict security rules, follows your project naming conventions, and ensures secrets are only stored as environment variable references.

    Use cases

    • Adding a signup and login flow to a fresh Express or FastAPI backend.
    • Protecting specific API routes with JWT middleware.
    • Migrating from plaintext storage to secure password hashing.
    • Scaffolding authentication models and controllers in a legacy project.

    How to install

    Drop the file into your AI Agent. Works with Claude, Cursor, ChatGPT, and 20+ more.

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    Creator

    Mariusz Wrzeszczynski
    Mariusz Wrzeszczynski

    109 skills on Agensi

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