Guides

Guides

Practical reference for developers working with JSON, YAML, JWTs, UUIDs, CSV, regex, hashes, Base64, cron expressions, and types inferred from JSON.

• How to format and validate JSON

  A practical guide to making JSON readable, finding syntax errors, and knowing what validation does not prove.

• JSON vs YAML

  Compare JSON and YAML syntax, tradeoffs, and the situations where converting between them is useful.

• JWT decoded vs verified

  Understand what a decoded JWT reveals, what signature verification proves, and how to read time claims safely.

• UUID v4 vs v7

  Choose between random UUID v4 and time-ordered UUID v7 for identifiers, databases, and event records.

• Convert JSON to CSV without Excel

  Turn an array of JSON objects into a usable CSV file, including nested values, missing keys, and formula-safe export.

• Unix timestamps explained

  Learn the difference between Unix seconds and milliseconds, how UTC fits in, and how to inspect JWT time claims.

• JavaScript regular expressions in practice

  Use JavaScript regex flags, groups, quantifiers, and performance safeguards without confusing the language with PCRE.

• MD5 vs SHA-256 checksums

  Choose a hash for integrity checks, understand HMAC, and keep checksums separate from password hashing and authentication.

• Base64 standard vs URL-safe

  Compare standard and Base64url alphabets, padding, UTF-8, size overhead, and why encoding is not encryption in URLs.

• Cron expression syntax

  Read five-field Unix cron expressions, avoid day-field surprises, and account for nicknames, UTC, and dialect differences.

• Generate types from JSON

  Turn JSON samples into TypeScript, Go, and Python types while accounting for optional fields, nulls, arrays, and schema gaps.