Developer Tools — Guides & Articles

• Cron Parser API Alternative: Validate Locally in Browser

  Published 2026-08-01

  Replace remote cron parser APIs with a browser tool that validates five-field expressions and shows the next five run times locally and in UTC.

  

• Cookie Converter Cheat Sheet: Strict RFC 6265 Pairs

  Published 2026-07-31

  Cookie converter cheat sheet for HTTP Cookie request headers: separators, percent-sequence rules, duplicate-key rejection, and code-unit budgets

  

• Can a Common Ports List Be Used as a Firewall Allowlist?

  Published 2026-07-31

  A common ports list is not a firewall allowlist on its own. See what it identifies, what an allowlist actually needs, and how to use this reference.

  

• How to Get a Code Image for Sharing and Docs

  Published 2026-07-31

  Get a code image as a PNG without uploading. Paste a snippet, choose a theme, font size, and padding, and download the PNG locally.

  

• Browser Clipboard Viewer Alternative for Hidden Characters

  Published 2026-07-31

  Looking for a clipboard viewer alternative? Inspect hidden characters, count UTF-8 bytes and code points, and validate JSON locally in your browser.

  

• Chmod Calculator Bulk: Convert Multiple Mode Bits

  Published 2026-07-31

  Process many chmod values through one strict octal and symbolic converter. Cover setuid, setgid, sticky bits, and all 4,096 modes in your browser.

  

• How to Strip Exactly One Leading BOM From Pasted Text

  Published 2026-07-31

  BOM Remover strips exactly one leading U+FEFF from decoded text in your browser. Internal, trailing, and second-leading occurrences stay intact.

  

• ASCII Chart Bulk: Reference All 128 7-Bit Codes

  Published 2026-07-31

  Bulk ASCII chart lookup for the standard 128 7-bit codes. Filter by category, search by name or value, and copy decimal, hex, octal, and binary rows locally.

  

• CSS Glass Effect: Backdrop Filter, Alpha, and Border Right

  Published 2026-07-30

  Build a CSS glass effect with validated backdrop blur, fill opacity, border opacity, and corner radius, then copy production-ready CSS.

  

• CSS Stripe Pattern: Build It With Repeating Gradients

  Published 2026-07-30

  Build a CSS stripe pattern with a validated angle, two colors, and two band widths. See the repeating-linear-gradient math and accessibility checks.