Resources
Tools, references, and learning material I use and recommend to other developers. Everything here is free.
Stop Exposing Secrets: Secure Your APIs in Postman Like a Pro
A must-read on keeping API keys and tokens out of your shared collections: environment variables, the Postman Vault, and the habits that prevent leaked credentials.
Discord Engineering Blog
Deep dives on scaling real-time systems to millions of concurrent users. Some of the best distributed-systems writing on the web.
Incident Report: Spotify Outage on April 16, 2025
A transparent, well-written postmortem from Spotify Engineering. A masterclass in how to communicate failures and learn from production incidents.
MDN Web Docs
The definitive reference for HTML, CSS, and JavaScript. When in doubt, MDN is the answer.
Next.js Docs
Exceptionally well-written docs. The App Router guides are worth reading even if you already know Next.js.
TypeScript Handbook
From basic types to advanced generics and type narrowing, this is the fastest path to writing real TypeScript.
web.dev
Google's guides on performance, accessibility, and Core Web Vitals. Practical and always up to date.
npmlens
My own CLI. Check a package's health score, security, bundle size, and dependency tree before you install it.
Json Tree
Visualize JSON as interactive graphs and trees. I built this to debug deeply nested API responses.
Bundlephobia
See the real cost of adding an npm package to your bundle before you install it.
Excalidraw
Hand-drawn style diagrams for system design discussions. Free, fast, collaborative.
regex101
Build and debug regular expressions with live explanation of every token.
transform.tools
Convert anything to anything: JSON to TypeScript interfaces, CSS to Tailwind, SVG to JSX.
JavaScript.info
The most complete modern JavaScript tutorial on the web, from fundamentals to the event loop.
Patterns.dev
Design, rendering, and performance patterns for modern web apps, with React-focused examples.
roadmap.sh
Community-driven roadmaps for frontend, backend, DevOps, and more. Great for finding your gaps.
Exercism
Free coding exercises with human mentorship in 70+ languages.
System Design Primer
The most-starred guide to designing large-scale systems. Essential interview prep and real-world reference.
HTTP Status Codes
Quick reference for every HTTP status code and when to actually use it.
JWT.io
Decode, verify, and debug JSON Web Tokens. Invaluable when building authentication.
DB Fiddle
Test SQL queries against MySQL, PostgreSQL, and SQLite right in the browser.