Interactive Developer Visualizers
Paste in your input and see every component color-coded and explained in plain English. Everything runs locally in your browser — no upload, no sign-up, no tracking.
Regex Visualizer
Paste a regular expression and see every token color-coded and explained in plain English. Live match preview, capture groups, and syntax hints.
JWT Visualizer
Decode a JWT and visualize the header, payload, and signature side-by-side with plain-English explanations of every registered claim and expiration status.
URL Anatomy
Paste any URL and see its scheme, userinfo, host, port, path, query, and fragment highlighted and explained side-by-side.
Why interactive visualizers?
A tool takes input and produces output. A visualizer takes input and shows you what it means — every character, claim, or segment annotated so you can teach, debug, or verify at a glance. All three below share the same privacy contract as the rest of DevKits: pure client-side JavaScript, nothing uploaded, nothing logged.