Developer Guides
In-depth explanations and quick references for JSON, encoding, security, and developer tools.
Guides
Concept articles — understand how it works.
What is a JWT Token?
JSON Web Tokens explained: structure, how they work, common algorithms, and security best practices.
What is Base64 Encoding?
Base64 explained: how it works, why it exists, common use cases, and the difference with Base64url.
How to Validate JSON
Understand what makes JSON valid, spot the most common errors, and go further with JSON Schema.
What is JSON?
JSON explained: data types, syntax rules, and why it became the universal data format for APIs and config files.
What is a Regular Expression?
Regex explained: character classes, quantifiers, anchors, groups, and practical patterns for everyday use.
What is Markdown?
Markdown explained: why it was created, how plain text becomes HTML, the core syntax, and where it is used today.
What is URL Encoding?
Percent-encoding explained: which characters must be encoded, how it works, and the difference between encodeURI and encodeURIComponent.
What is a Hash Function?
Hash functions explained: one-way digests, MD5 vs SHA-256, use cases, and why you should never hash passwords with SHA.
What is XML?
XML explained: element structure, attributes, well-formed vs valid, XML vs JSON, and where XML is still used today.
What is a UUID?
UUIDs explained: the 5-part structure, v1 vs v4 vs v7, uniqueness guarantees, and when to choose UUID over auto-increment.
What is JSON Schema?
JSON Schema explained: core keywords, composition, Draft-07 vs 2020-12, and practical validation use cases.
What is YAML?
YAML explained: indentation-based syntax, scalars, sequences, anchors, and common gotchas like the Norway problem.
Reference
Cheatsheets, examples, and comparisons — look it up while you code.
JSON vs YAML: What's the Difference?
A side-by-side comparison of JSON and YAML — syntax, use cases, and when to choose one over the other.
Markdown Cheatsheet
A quick reference for all Markdown syntax — headings, emphasis, links, code blocks, tables, task lists, and more.
Regex Cheatsheet
A quick reference for regular expression syntax: character classes, quantifiers, anchors, lookarounds, flags, and common patterns.
JSON Best Practices
Naming conventions, dates, null vs omit, large numbers, pagination, error responses, and nesting — the conventions that save debugging time.
Cron Expression Examples
A practical reference for cron syntax: field breakdown, special characters, and ready-to-use schedules.