Developer Guides & References
15 practical, workflow-focused guides for everyday development tasks — debugging API responses, validating tokens safely, checking DNS/SSL before launch, and quick command references for Git, cURL, npm, and Docker.
Practical Guides
Step-by-step workflows for real debugging and development tasks
How to Debug API JSON Responses Safely in the Browser
A practical workflow for inspecting, formatting, and comparing API JSON responses in the browser without pasting sensitive data into random online tools.
How to Validate JWT Tokens Without Exposing Secrets
How to safely inspect a JWT's header and payload during debugging without pasting live tokens or signing secrets into tools that could log or leak them.
How to Format SQL Queries Before Code Review
Why unformatted SQL slows down code review, and a consistent workflow for formatting queries so reviewers can spot logic bugs instead of parsing indentation.
How to Check DNS and SSL Before Launching a Website
A pre-launch checklist for verifying DNS records and SSL certificates so a new domain or migrated site doesn't go live with broken email, mixed content warnings, or an expired certificate.
How to Safely Decode and Inspect Base64 and Encoded Strings from Untrusted Sources
Base64 is encoding, not encryption — anyone can decode it. Here's how to inspect encoded strings from logs, tokens, or webhook payloads without assuming they're safe or private.
How to Convert Images to WebP for Faster Pages
WebP typically cuts image file size significantly versus JPEG or PNG at similar visual quality. Here's a practical workflow for converting images without breaking transparency, quality, or older-browser support.
How to Choose the Right Password or Hash for the Job
Password generation, password hashing, and general-purpose hashing solve different problems — using the wrong one is a common, avoidable security mistake. A practical decision guide.
How to Test Regex Patterns Safely (Without Freezing Production)
A workflow for testing regex patterns against real-world edge cases and catastrophic backtracking risk before they ever reach production input validation.
How to Minify Code Before Production
A practical checklist for minifying CSS, JavaScript, HTML, and JSON before deployment — what to minify, what to keep readable, and how to avoid shipping a silently broken build.
How to Use Browser-Based Developer Tools Safely in Corporate Environments
What to check before pasting company code, API keys, or customer data into any browser-based tool at work — and what "runs entirely in your browser" actually means and doesn't mean.
Command References
Quick reference checklists and command cheat sheets
SEO Technical Checklist for Small Websites
A practical, ordered checklist of the technical SEO fundamentals a small site or side project needs — sitemap, robots.txt, canonicals, structured data, and metadata — before worrying about anything more advanced.
Git Command Reference for Developers
The Git commands developers actually use day to day — status, branching, staging, committing, and safely undoing changes — with the distinctions that matter (like reset vs revert).
cURL Command Reference for API Testing
The cURL flags and patterns used for everyday API testing — GET/POST requests, headers, auth, and inspecting responses — without needing a full GUI API client.
npm, Yarn, and pnpm Command Reference
The equivalent commands across npm, Yarn, and pnpm for everyday package management tasks — install, add, remove, run scripts, and update — side by side.
Docker Command Reference for Developers
The Docker commands used for everyday container work — running, inspecting, logging, and cleaning up containers and images — without needing the full Docker CLI manual.
Related Developer Tools
Apply what you learn with these free browser-based tools — no account or install needed.