Developer Glossary

Definitions, comparisons, and troubleshooting guides for formats used across our browser-first tools. Every article links to related utilities — no account required.

• What is JSON?

  JSON (JavaScript Object Notation) explained — syntax, data types, and how developers use JSON in APIs and configs. Free tools included.

• What is a JWT?

  Learn what JSON Web Tokens (JWT) are, how header.payload.signature works, and how to decode JWTs safely in your browser.

• What is Base64?

  Base64 encoding explained — how binary data becomes ASCII text, URL-safe variants, and when to use Base64 in development.

• What is YAML?

  YAML explained for developers — indentation-based config files, comparison to JSON, and when to choose YAML vs JSON.

• JSON vs YAML

  Compare JSON and YAML — syntax, use cases, pros and cons, and when to convert between them for APIs vs configuration.

• JWT Structure Explained

  Break down JWT header, payload, and signature segments. Learn Base64URL encoding and how to inspect tokens safely.

• Common JSON Errors

  Fix common JSON syntax errors — trailing commas, single quotes, unquoted keys, and comments. Line-level validation tips.

• What is Regex?

  Regular expressions explained — patterns, flags, capture groups, and when developers use regex for validation and parsing.

• What is a PDF?

  Portable Document Format (PDF) explained — structure, use cases, and how browser PDF tools work without uploading files.