toolkit

A collection of browser-based tools for developers. No server, no tracking, no external dependencies — everything runs locally in your browser.

Tools

Route	Description
/	About
/object-id	MongoDB ObjectId generator & parser
/uuid	UUID v1/v4/v6/v7 generator & parser
/hash	MD5, SHA-1, SHA-256, SHA-512
/cron	Interactive crontab expression builder with presets
/api-key	High-entropy API key generator (hex, base62, base64url, …)
/json	Prettify, compact, tab-indent, validate JSON
/base	Encode & decode Base64, Base64url, Base32, Base58, Base16
/string	String transforms: lower, UPPER, snake_case, camelCase, …

Stack

• SvelteKit 2 + Svelte 5
• JavaScript with JSDoc — no TypeScript
• No runtime dependencies

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Development

npm install
npm run dev

App runs at http://localhost:5173.

Production build

npm run build
node build        # listens on PORT (default 3000)

Type check

npm run check

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Deploy with Docker

Build and run

docker build -t toolkit .
docker run -p 3000:3000 -e ORIGIN=http://localhost:3000 toolkit

docker-compose

docker compose up -d

App runs at http://localhost:3000.

Behind a reverse proxy

Set ORIGIN to your public URL in docker-compose.yml:

environment:
  - ORIGIN=https://your-domain.com

Then proxy traffic to port 3000.

Environment variables

Variable	Default	Description
PORT	3000	Port the server listens on
HOST	0.0.0.0	Interface to bind
ORIGIN	—	Public URL (required in production)