Developer Tools — Guides & Articles

• MIME Type Lookup API Alternative Without Network Calls

  Published 2026-09-28

  Skip external MIME type lookup APIs. A browser-local reference of 24 common media types — search by extension, format, or MIME string and copy the exact…

  

• How to Make a Mesh Gradient Background in CSS

  Published 2026-09-28

  Create a CSS mesh-style background from four radial-gradient layers and one base color. Adjust colors and fade spread in a live preview, then copy the CSS.

  

• How to Get a MAC Address in CMD for Development

  Published 2026-09-28

  getmac in CMD shows your hardware MAC. For tests, fixtures, and VMs, generate random locally administered unicast 48-bit addresses in your browser.

  

• Linux Commands Cheat Sheet Alternative Built for Safety

  Published 2026-09-27

  A Linux commands cheat sheet alternative focused on safety: thirteen GNU Coreutils templates with placeholder notes, overwrite prompts, and no destructive…

  

• JSON to XML Alternative Built on a Typed Mapping

  Published 2026-09-27

  A typed, browser-side JSON to XML alternative with a documented mapping, user-chosen root name, and processing that stays on the local machine. See exactly…

  

• JavaScript Key Code Finder: Decoding KeyboardEvent Fields

  Published 2026-09-27

  A JavaScript Key Code Finder decodes one focused keydown event into key, code, location, modifiers, repeat, composition, and the legacy keyCode so you can…

  

• Generate a JWT Token Online: HS256 vs RS256

  Published 2026-09-27

  Generate a JWT token online with HS256 in the browser, see when HS256 fits and when you actually need RS256, and verify with a JOSE library.

  

• How to Decode a JWT Token in Java: Inspect Claims Locally

  Published 2026-09-27

  Decode a JWT token in Java without jjwt or java-jwt. A local browser decoder reads header, payload, and RFC 7519 claims without uploading the token.

  

• How to Validate JSON Files in Visual Studio Code

  Published 2026-09-27

  Visual Studio Code checks JSON syntax automatically, but its errors can be vague. Use a focused JSON Validator for exact line and column errors in your browser.

  

• Does a Generated Zod Schema Prove Your API Contract?

  Published 2026-09-27

  A sample-inferred Zod schema describes one JSON value, not the full API contract. Learn what the converter guarantees, what it refuses to guess, and how to…