Developer reference
Dense, accurate lookup tables for things developers check often. Each one links to the tool that puts it to work.
Regex Flags Reference
Every JavaScript regular-expression flag (g, i, m, s, u, y, d, v), what it does, and an example. A quick reference for regex modifiers.
UUID Versions Reference
Compare UUID versions: v1, v3, v4, v5, v6, v7. How each is generated, whether it is time-ordered, and when to use it.
Hash Algorithm Comparison
Compare common hash algorithms: output size, collision resistance, and recommended use. MD5, SHA-1, SHA-256, SHA-384, SHA-512.
Cron Syntax Reference
Cron expression fields and special characters explained, with common schedule examples like every 5 minutes and every day at midnight.
Base64 Alphabet Reference
The Base64 alphabet (index to character), how padding works, and the difference between standard and URL-safe Base64.
JSON Flattening Notation Reference
How nested JSON flattens to CSV columns: dot notation for object keys, [n] for array indices, quoting for keys with dots, and the four array strategies.
JSON to TypeScript, Go, and Zod Type Mapping
Which TypeScript, Go, and Zod type each JSON value becomes, and how an optional key differs from a null value in all three.
X.509 Extension and OID Reference
Every common X.509 certificate extension OID, all nine Key Usage bits, the Extended Key Usage purposes, and the DN attribute short names, with what each one means.