Guides

Learn historical and legacy ciphers, their limits, and why modern encryption is different.

Encryption is a cryptographic process that transforms plaintext into ciphertext using an algorithm and a key to provide confidentiality.

Learn symmetric encryption, public key cryptography, and hybrid encryption, plus how to choose the right approach.

Convert text to upper or lower case safely for normalization and display.

Turn HTML into clean Markdown for docs and README files.

Strip HTML markup while keeping readable text output.

Convert Markdown into publish-ready HTML using CommonMark and compatible extensions.

Generate strong passwords using secure randomness, safe length, and modern storage.

Compare text files and configs to spot meaningful changes safely.

Convert Unix (POSIX) epoch timestamps to human-readable dates safely.

Authoritative guide to AWS Signature Version 4 (SigV4): how request signing works, what is signed, and how to debug common errors.

Use bcrypt for secure password hashing and verification.

Translate cron expressions into readable schedules and avoid common mistakes.

Convert flat CSV data to JSON and back, handle headers, types, nulls, and nested fields safely.

Learn safe JSON serialization and parsing in JavaScript, including edge cases and pitfalls.

Learn when to format JSON for readability and when to minify JSON for transport.

JSON linting checks JSON syntax so payloads can be safely parsed before use.

Compare legacy hash algorithms and learn when to use SHA-256.

Chain encodings and text transforms into repeatable, verifiable pipelines.

Learn percent-encoding rules for query strings and safely encode URLs for APIs.

Understand UUID and GUID formats, versions, use cases, and generation rules.

Convert XML and JSON using explicit mapping rules and known tradeoffs.

Validate YAML syntax and format configuration files safely and consistently.

Convert YAML to JSON and JSON to YAML safely using spec-aligned rules.

Convert ASCII text to hex (Base16) and decode hex back into readable text—safely and consistently.

Decode Base64 payloads and safely identify, validate, and handle JSON or XML.

Compare Base64 and Base64URL encodings and learn when URL-safe output matters.