DataKit — Developer Swiss Army Knife

A compact popup of developer utilities for everyday data tasks. Runs entirely offline — no network calls, no tracking.

DataKit brings thirteen everyday developer utilities into a single popup. Open it, paste your input, and copy the result — without switching browser tabs or pasting into online services. ━━━━━━━━━━━━━━━━━━ WHAT'S INSIDE ━━━━━━━━━━━━━━━━━━ Format • JSON — pretty-print, minify, validate, explore in a tree view, and query with a path expression • YAML — convert back and forth with JSON • SQL — formatter that understands several popular database dialects • CSV — switch between raw CSV and a JSON table view Encode • Base64 and URL — encode or decode, with full Unicode support • Hash — generate common cryptographic digests from any string Inspect • JWT — decode the header, payload, and expiry of a signed token • Timestamp — convert between epoch seconds and readable dates in any timezone • Regex — test patterns live with flag toggles and capture-group output Compare • Structural diff — compare two objects by their structure rather than as text • Text diff — line-by-line comparison with inline highlights Generate • UUID — produce identifiers in bulk with one-click copy • Type generator — turn a JSON sample into a type definition for TypeScript, Go, or Python ━━━━━━━━━━━━━━━━━━ WHY DATAKIT ━━━━━━━━━━━━━━━━━━ • Fast — every tool is one click away, or one number key (1 through 0) to jump between tabs • Private — runs entirely in your browser, with no network calls and no tracking • Focused — paste, transform, copy, close. No upsells, no cloud sync, no account • Keyboard-friendly — Cmd+Enter (Ctrl+Enter on Windows) runs the primary action on every tab • Local history — each tool remembers your recent inputs so you can pick up where you left off ━━━━━━━━━━━━━━━━━━ PRIVACY ━━━━━━━━━━━━━━━━━━ Your data never leaves your browser. DataKit requests no host permissions, which means it cannot read the pages you visit, and it makes no network calls of any kind. Every transformation runs inside the popup, in your browser's own process. Built for engineers who work with structured text every day and want one quiet tool instead of a tab full of online utilities.