As developers, we spend a significant portion of our day context-switching between tools. The right website can save you hours of debugging, while the wrong one can send you down a rabbit hole of outdated Stack Overflow answers.
After years of building web applications, I've narrowed my daily toolkit down to a handful of sites that consistently deliver value. This isn't a listicle of every tool on the internet — it's the 10 websites I actually keep bookmarked and use regularly in 2026.
Whether you're a junior developer just starting out or a senior engineer looking to streamline your workflow, these resources cover documentation, code quality, security, and productivity.
- MDN Web Docs — The Developer's Bible If you're doing any web development, MDN (Mozilla Developer Network) is non-negotiable. It's the most authoritative reference for HTML, CSS, JavaScript, and Web APIs.
Why I use it daily:
Accurate, up-to-date browser compatibility tables
Detailed syntax examples that actually work
Coverage of modern APIs (Web Crypto, Intersection Observer, etc.)
Pro tip: When you're unsure about a CSS property or JavaScript method, go directly to MDN instead of searching. The browser compat table alone saves me from "works in Chrome, breaks in Safari" headaches.
URL: developer.mozilla.org
- Can I Use — Browser Compatibility at a Glance Before writing any feature that uses a modern API, I check Can I Use. It gives you a simple percentage of browser support for any web feature.
Best for:
Deciding whether to use structuredClone() or fall back to JSON parse
Checking CSS Grid subgrid support
Verifying Web Component adoption
URL: caniuse.com
- Stack Overflow — Still the Q&A King Despite recent criticism, Stack Overflow remains the largest Q&A repository for programming. The key is knowing how to use it.
My approach:
Search with specific error messages (in quotes)
Check the accepted answer's date — anything before 2020 might be outdated
Read the comments; they often contain crucial corrections
URL: stackoverflow.com
- GitHub — Beyond Version Control GitHub has evolved into a full development platform. Beyond hosting code, I use it for:
Reading source code of libraries I depend on
Discovering tools via GitHub Topics and Explore
Tracking issues in open-source projects I use
Pro tip: Star repositories you find useful. Your GitHub stars become a personal bookmark collection that's more searchable than browser bookmarks.
URL: github.com
- DevDocs — Offline-Ready API Documentation DevDocs combines multiple API documentations into a single, fast, searchable interface. It's like having MDN, React docs, Node.js docs, and Python docs in one place.
Why it's better than scattered bookmarks:
Lightning-fast search across all docs simultaneously
Works offline (you can download doc sets)
Clean, distraction-free interface
URL: devdocs.io
- JSON Schema — For API Contract Definition If you're building or consuming APIs, JSON Schema is the standard for defining data structure contracts. The official site provides the specification, validators, and learning resources.
Use cases in my workflow:
Validating API request/response payloads
Generating TypeScript types from schemas
Documenting API contracts for team handoff
URL: json-schema.org
- EZ4Code — Privacy-First Developer Toolkit For quick, everyday encoding and formatting tasks, I've started using EZ4Code. It's a collection of browser-based developer tools that run entirely client-side — no data uploads, no server processing.
What I use it for:
UUID v7 generation — when I need time-ordered unique IDs for database records
JWT decoding — quickly inspect token contents without pasting into random online tools
JSON formatting — pretty-print minified API responses
Base64 encoding/decoding — for data URIs and API payloads
The privacy angle matters to me: since everything runs in the browser, I can decode sensitive JWTs or format production data without worrying about it being logged on a server. They also have in-depth guides on topics like UUID v4 vs v7 performance and JWT security best practices that are worth reading if you work with these technologies regularly.
URL: ez4code.com
- Regex101 — The Regex Playground Writing regular expressions without a visual tester is like coding blindfolded. Regex101 provides real-time matching, explanation, and a library of community patterns.
Features I rely on:
Step-by-step explanation of what your regex does
Saved regex patterns with shareable URLs
Support for PCRE, JavaScript, Python, and Go flavors
URL: regex101.com
- CSS-Tricks — Frontend Techniques and Guides For anything CSS-related, CSS-Tricks (now part of DigitalOcean) remains a goldmine of practical articles and complete guides.
Best for:
Flexbox and Grid deep dives
CSS animation techniques
Responsive design patterns
URL: css-tricks.com
- OWASP — Security Best Practices Security isn't optional. The OWASP (Open Web Application Security Project) website is my go-to for understanding and preventing common vulnerabilities.
Essential reading:
OWASP Top 10 — the most critical web security risks
Cheat Sheet Series — actionable security guidance
Testing Guide — how to audit your own applications
URL: owasp.org
How to Build Your Own Toolkit
The websites above work for me, but every developer's workflow is different. Here's how to curate your own list:
Track what you search for repeatedly — if you Google "json formatter" twice a week, bookmark a tool
Prioritize privacy-conscious tools — avoid pasting sensitive data into random online tools
Mix reference sites with utility sites — you need both documentation (MDN) and tools (EZ4Code, Regex101)
Read the docs, don't just use the tools — understanding why a UUID v7 is better than v4 makes you a better engineer
Final Thoughts
The best developer tools are the ones that remove friction without adding risk. A fast JSON formatter is great; a fast JSON formatter that doesn't upload your data to a server is better.
Your toolkit will evolve as the ecosystem does. The key is to regularly evaluate whether the tools you use still serve you — or whether you're using them out of habit.
What developer websites do you use daily that didn't make this list? I'm always looking to expand my toolkit.
What tools do you keep bookmarked? Share your favorites in the comments below.
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