Mongoose 9 Migration Guide: What Actually Breaks in a Real MERN App
Upgrading to Mongoose 9? Here's what actually breaks in real MERN apps: pre-save hooks, plugins, TypeScript types, and how to fix each one.
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Free Client-Side Risk Scanner for AI-Generated Code Diffs
Paste a git diff or patch and get an instant, free risk scan for the patterns AI coding agents slip in fastest: hardcoded secrets, disabled TLS checks, eval/exec injection, string-built SQL, and oversized deletions. No login, no upload, runs entirely in your browser.
Free-Threaded Python (No-GIL) Compatibility Scanner
Paste your Python code and find the shared counters, caches, and lazy singletons that are safe under the GIL but race under free-threaded Python 3.13t/3.14t. Each finding explains why it was safe with the GIL, what breaks without it, and how to fix it. Runs entirely in your browser.
Interactive CSS @scope Playground
Edit HTML and CSS side by side and watch the CSS @scope root and scope limit highlight live on the rendered page. Load preset examples, toggle @scope on and off to see style leakage, and copy the snippet. Runs entirely in your browser.