A Developer Toolbox for the Work Around the Code

Every developer accumulates a bookmark folder of single-purpose sites: one for formatting JSON, one for decoding a token, one for generating a UUID, one for explaining a cron expression. Toolbit collects that folder into one workspace that works offline and never uploads anything.

One workspace instead of fifteen tabs

Tools open as tabs inside a single workspace. Output from one can be piped into a compatible next tool, so a Base64 blob becomes a decoded JWT becomes formatted JSON without any copy-pasting between sites. A command palette reaches any tool in two keystrokes, and recent work stays in your history.

What is in the box

Format and validate: JSON, YAML, XML, SQL, CSS, GraphQL, and nginx configs. Encode and decode: Base64, URLs, HTML entities, JWTs, certificates, protobuf. Generate: UUIDs, hashes, passwords, TOTP codes, QR codes, lorem ipsum, and fake test data. Transform: CSV to JSON, timestamps, colours, units, images, and text case. Inspect: regular expressions, text and git diffs, cron expressions, and HTTP status codes. Build: HTTP requests, WebSocket sessions, cron entries, and Docker commands.

Built for the way the work actually arrives

These tasks interrupt something else, so the toolbox is built for speed: paste-and-see-the-answer rather than fill-in-a-form-and-submit, keyboard shortcuts everywhere, smart detection that guesses what you pasted, and a URL per tool so you can bookmark or share the exact one you need.

Free, open source, and private

No account, no paid tier, no advertising, no analytics. The source is MIT-licensed on GitHub, and because everything runs client-side you can verify the privacy claim in your own network tab.

Start with these tools

• JSON Formatter Format, validate and beautify JSON instantly. Pretty-print, minify, sort keys, and explore a tree view. Runs locally…
• YAML Formatter Format and validate YAML, and convert between YAML and JSON in both directions. Runs locally in your browser with no…
• Regex Tester Test regular expressions with live match highlighting, capture groups, and replace preview. Runs locally in your…
• API Request Builder Send HTTP requests and inspect status, headers, timing, and body. A fast, local Postman alternative that runs in your…
• Docker Command Builder Build docker run commands and docker-compose files visually, with ports, volumes, and environment variables. Runs…
• Cron Expression Parser Translate a cron expression into plain English and preview the next run times. Runs locally in your browser with no…

Frequently asked questions

How many tools are included?

Over forty, spanning formatters, encoders, generators, converters, inspectors, and builders.

Can I install it as an app?

Yes. It installs as a PWA from the browser, and native builds are available for macOS, Windows, and Linux.

Is it really free?

Yes — free, open source under the MIT licence, with no paid tier and no ads.