Developer Tools— Guides & Articles

• 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.

  

• Minify JSON in VS Code Without Breaking Numbers

  Published 2026-08-10

  Minify JSON in VS Code with a strict in-browser tool. Reject duplicate keys, unsafe numbers, and silent precision loss before pasting back.

  

• Convert JSON to Rust Struct With Serde Derives

  Published 2026-08-10

  Paste a strict JSON sample and get Serde-ready Rust structs with nested objects, Vec, Option fields, and identifier collision handling — no upload, no compile.