Developer Generators

🔐 How to Set Up 2FA the Right Way: TOTP, Backup Codes, and What Actually Breaks

A practical guide to implementing two-factor authentication correctly — why TOTP beats HOTP for most cases, how backup codes should actually be stored, and the handful of mistakes that account for nearly every real-world 2FA bug report.

🆔 UUID v7 vs v4 vs ULID: Which One Should Actually Be Your Database Primary Key

Random UUIDv4 primary keys quietly wreck your index performance as tables grow. Here's why, and how UUIDv7 and ULID fix it without giving up the properties that made you choose a UUID in the first place.

🤖 robots.txt for AI Crawlers in 2026: What to Actually Block

GPTBot, ClaudeBot, CCBot and others can eat 40% of your bandwidth during a deep crawl. Here's the selective-blocking approach more site owners are taking instead of an all-or-nothing rule.

🏷️ JSON-LD Structured Data: Why It Matters More in 2026 Than It Used To

Structured data used to be a minor rich-results nice-to-have. In 2026 it's also how AI Overviews and answer engines decide what to cite — and pages without it are being left out.

🔧 The Git Errors Every Developer Hits (and the Exact Fix for Each)

Failed to push some refs, refusing to merge unrelated histories, detached HEAD, and merge conflicts — the Git errors everyone Googles at least once. Here's what each one actually means and how to resolve it.

🎲 Mock Data for API Testing: How to Generate Realistic Test Data Without a Real Backend

Waiting on a backend, real data, or production access shouldn't block frontend work or test coverage. Here's how and when to use generated mock data — and where it falls short.