DevKit

Developer Swiss Army Knife: JSON, Base64, JWT, Regex, Color, Timestamp, UUID - Pro: Snippet Library, API Tester, Diff Viewer, UUID.

DevKit – Developer Toolbox DevKit is a lightweight Chrome extension that puts your most-used developer tools one click away – without leaving the current tab. Free tools included: → JSON Formatter & Viewer Paste raw JSON and get clean, syntax-highlighted, collapsible output. Error messages show exactly where your JSON breaks. → Base64 Encoder / Decoder Encode or decode strings instantly. Full UTF-8 support handles special characters correctly. → JWT Decoder Decode any JWT token into readable header and payload. See the expiry timestamp at a glance. No signature verification – and no need to paste tokens into third-party websites. → Timestamp Converter Convert Unix timestamps to human-readable dates and back. Supports local time, UTC, and ISO 8601 format. → UUID Generator Generate a cryptographically secure UUID (v4) with one click, using the native browser crypto API. → Regex Tester Test your regular expressions against any input string in real time. Matches are highlighted. Supports flags: global, case-insensitive, multiline. → Color Picker Pick a color and copy it as HEX, RGB, or HSL. Useful for quick CSS work without opening a full design tool. DevKit Pro (one-time $4.99 via Gumroad): Upgrade unlocks: Snippet Library – save and reuse your most common patterns, strings, and UUIDs, synced across Chrome profiles API Tester – send GET/POST requests with custom headers directly from the popup Diff Viewer – compare two JSON or text blocks line by line UUID Bulk Generator – generate up to 1,000 UUIDs at once, copy all or export as .txt Export Function – save any tool output as .json or .txt Keyboard Shortcuts – reach any tool without clicking Privacy first: All processing happens locally in your browser. No data is sent to any server. No account required. No tracking. DevKit is built for developers who value speed, privacy, and a clean interface.