bytegeist-toolbox/docs/PORTFOLIO.md

ByteGeist Toolbox

Project Description

ByteGeist Toolbox is a lightweight website and network diagnostics app that combines a website status checker, DNS lookup, SSL certificate checker, and HTTP headers checker in one plain HTML, CSS, JavaScript, Node.js, and Express application.

Key Features

• Website status checks with status code, response time, redirects, final URL, and timestamp.
• DNS lookups for A, AAAA, CNAME, MX, TXT, and NS records.
• SSL certificate inspection with issuer, subject, validity dates, trust status, TLS protocol, cipher, resolved address, and SHA-256 fingerprint.
• HTTP response header inspection with common security-header presence indicators and raw header output.
• Responsive browser interface for desktop, tablet, and phone widths.

Security Work

• Restricted URL checks to HTTP and HTTPS.
• Blocked URL credentials and nonstandard ports.
• Validated DNS resolution before outbound requests.
• Blocked loopback, private, link-local, local, reserved, and related non-public address ranges.
• Revalidated redirect destinations before following them.
• Added redirect limits, network timeouts, rate limiting, and safe client-facing errors.
• Used Node APIs for network work without shell execution.

Testing Work

• Uses Node's built-in test runner.
• Current automated test count: 62 tests.
• Covers hostname validation, URL security checks, DNS helpers, SSL helper logic, HTTP header analysis, and public-network integration behavior.
• Current full test suite requires internet access.

Deployment Architecture

• Node.js and Express app served from a Docker container.
• Production port: 3001.
• Docker Compose service: bytegeist-toolbox.
• Reverse proxy: Nginx Proxy Manager over the external nginx-proxy-manager_default Docker network.
• Public site: https://toolbox.casko.dev.

Technologies Used

• HTML
• CSS
• JavaScript
• Node.js
• Express
• Docker
• Docker Compose
• Node test runner

Resume Entry

ByteGeist Toolbox - Built and prepared a production-ready Node.js diagnostics toolbox with four public website inspection tools, SSRF-resistant outbound request validation, Docker deployment, and automated test coverage.

Resume Bullets

• Built a lightweight Express application providing website status, DNS, SSL certificate, and HTTP header inspection tools.
• Implemented outbound request controls to block private, loopback, link-local, reserved, local, credentialed, and nonstandard-port destinations.
• Added redirect revalidation, redirect limits, network timeouts, rate limiting, and safe client-facing error handling.
• Designed a responsive plain HTML, CSS, and JavaScript interface without adding frontend frameworks.
• Wrote and maintained 62 automated tests with coverage for validation, network helper logic, and integration behavior.
• Containerized the app with Docker and Docker Compose for deployment behind Nginx Proxy Manager.
• Documented release, deployment, security controls, limitations, and production verification steps for v1.0.0.

LinkedIn Project Description

ByteGeist Toolbox is a lightweight Node.js and Express diagnostics app for checking website status, DNS records, SSL certificates, and HTTP headers. I prepared the project for a v1.0.0 release with Docker deployment docs, SSRF-resistant request validation, rate limiting, responsive UI checks, and 62 automated tests.

Skills Demonstrated

• Node.js backend development
• Express routing and middleware
• Secure outbound request validation
• DNS, HTTP, and TLS diagnostics
• Docker deployment
• Automated testing
• Responsive frontend implementation
• Release documentation