Developer Tools— Guides & Articles

• How to Create Flexbox in CSS: A Practical Walkthrough

  Published 2026-07-18

  Step-by-step guide to creating a CSS Flexbox container. Configure direction, wrapping, alignment, and gap, preview it live, and copy clean, validated CSS.

  

• Create a Dummy File in CMD with Exact Size and Content

  Published 2026-07-18

  Need a test file of a precise byte size in Windows? Use CMD commands or a browser-based Dummy File Generator to create zero-filled, random, or text-pattern…

  

• How to Create a Directory Tree in CMD: A Practical Walkthrough

  Published 2026-07-18

  Step-by-step guide to creating a directory tree in CMD using mkdir and batch files, plus a browser-based Directory Tree Generator for copy-ready trees.

  

• Convert CSV to JSON Directly in Excel Without Losing Data

  Published 2026-07-18

  Turn Excel CSV exports into valid JSON arrays in one browser tab—preserve quoted commas, line breaks, and UTF-8 characters without macros or uploads.

  

• How to Make a 3x3 Grid in CSS: A Practical Walkthrough

  Published 2026-07-18

  Build a clean 3x3 CSS grid with the CSS Grid Generator. Set columns, rows, gap, and item alignment, preview live, and copy standards-based CSS.

  

• Convert Cookie Headers to JSON and Back in Your Browser

  Published 2026-07-18

  Turn strict Cookie request headers into JSON key-value maps and reverse the process locally—no decoding, no silent overwrites, no uploads.

  

• Chmod Calculator: Octal and Symbolic Conversion Tool

  Published 2026-07-18

  Convert Unix file permissions between octal numbers and rwx notation instantly. Use the Chmod Calculator to handle setuid, setgid, and sticky bits without…

  

• How to Remove a Leading BOM From Text in Your Browser

  Published 2026-07-18

  Strip a single invisible U+FEFF byte order mark from the start of decoded text using the BOM Remover, while preserving every internal or trailing occurrence…

  

• How to Use ASCII Code for Programming and Data Tasks

  Published 2026-07-18

  ASCII codes map 128 standard characters to decimal, hex, octal, and binary values. Use an ASCII table to look up codes instantly without memorization.

  

• Decode JWT Tokens Without Code in Your Browser

  Published 2026-07-17

  Decode JWT headers and payloads instantly in your browser—no libraries, no uploads, and a clear unverified warning so you know when to validate.