Developer Tools — Guides & Articles

• Remove a 'Bomb Shelter Door Handle' (BOM) From Text

  Published 2026-08-12

  A 'bomb shelter door handle' in text is a leading U+FEFF BOM. Learn why it breaks parsers and how to strip exactly one from decoded text with BOM Remover.

  

• Show 2K26 Badge Perks as a Shields.io README Badge

  Published 2026-08-12

  Turn your NBA 2K26 badge perks into a Shields.io badge you can paste into any README, profile, or wiki — no path escaping needed.

  

• ASCII Chart Cheat Sheet: All 128 Codes in 4 Notations

  Published 2026-08-12

  Use this ASCII chart cheat sheet to look up every standard 7-bit code with decimal, hexadecimal, octal, and binary values side by side.

  

• How to Avoid Mistakes When Generating ANSI Color Codes

  Published 2026-08-12

  Stop guessing SGR parameters. See the most common mistakes when generating ANSI color codes and how a builder workflow prevents them.

  

• Generate a JWT for a GitHub App with HS256

  Published 2026-08-12

  Generate a JWT for a GitHub App with HS256 in your browser. Build strict JSON claims, sign with Web Crypto, and verify the compact token against your JOSE…

  

• How to Decode a JWT Access Token in Your Browser

  Published 2026-08-11

  Decode a JWT access token locally by pasting the compact token. The tool exposes the header and payload as JSON. Decoding only reads claims; it does not…

  

• How to Validate JSON Syntax and Pinpoint Errors

  Published 2026-08-11

  Validate JSON in-browser against RFC 8259. Get line-and-column error locations and a structure report on depth and key counts, with no upload.

  

• Convert JSON to a Zod Schema From a Sample

  Published 2026-08-11

  Convert JSON to a Zod schema from a single sample. Get readable source with required, optional, nullable, and union fields inferred locally — no upload.

  

• JSON or XML: Which Is Better and When to Convert

  Published 2026-08-11

  Compare JSON and XML, see when each wins, and convert JSON to escaped typed XML with a mapping that preserves numbers, booleans, null, and array order.

  

• How to Calculate an IPv6 Subnet Mask Step by Step

  Published 2026-08-10

  Calculate an IPv6 subnet mask for any /0 to /128 prefix length. Returns RFC 5952 text, network prefix, numeric bounds, and exact address count locally.