whoami — a tiny toolbox for developers

Sharp tools for people who ship code.

Decode a JWT before it bites you in production. Untangle cron syntax. Hash a file, look up a status code, write a commit message you won't regret — all inside your browser tab. Nothing ever leaves it.

Browse the tools Why client-side?
  • 5 tools
  • 0 trackers
  • 0 accounts
  • 100% client-side

$ Stackblip --list-tools

$

the toolbox

Five tools. One tab. No setup.

Everything below runs on your machine. Bookmark once, use forever.

auth runs client-side

JWT Decoder & Debugger

Paste a token and see what's actually inside — header, claims, expiry — decoded the moment you hit paste. It flags expired tokens and malformed segments before they waste an afternoon.

Open the decoder
scheduler

Cron Expression Builder

Cron is a write-only language. Build expressions with plain inputs, read them back in English, and preview the next five run times — no man page required.

Build an expression
crypto

Multi-Hash Generator

MD5 through SHA-512, from text or files. Checksum a release, verify a download, compare digests — computed locally, case-toggled, one-click copy.

Generate a hash
http

HTTP Status Code Lookup

Every status code with what it actually means and who's responsible — your browser, your server, or the proxy in the middle. Searchable, filterable, opinionated.

Look up a code
git

Conventional Commit Generator

Pick a type, add a scope, flag the breaking change, copy the message. Conventional Commits without the syntax anxiety — your future self will thank you.

Write a commit

why this exists

Built like tools should be.

  1. Everything runs in your browser

    These tools are plain JavaScript executing on your machine. There's no API to fall over, no rate limit, no queue. Close the tab and the whole thing is gone.

  2. Your data never leaves the page

    No analytics, no cookies, no phone-home requests. Paste a production JWT if you want to — there's physically nowhere for it to go. View source and verify.

  3. Fast by construction

    No framework, no build pipeline, no two-megabyte bundle. The entire site weighs less than a single photo from your phone — it loads instantly even on hotel Wi-Fi.

  4. Free, no strings attached

    No account, no trial, no premium tier waiting to happen. Just tools you bookmark once and stop thinking about — the way a utility should work.

under the hood

Nothing to hide, because there's nothing hiding.

Most "free online tools" are data pipelines with a UI bolted on. Stackblip is the opposite: plain HTML, CSS and JavaScript, served to your browser and executed there. No framework, no build artifacts, no analytics SDK whispering home about what you pasted.

The entire site is lighter than a single photo from your phone, and every byte of it is readable with View Source. If this page ever claims something the Network tab can't prove, call it out.

Verify it yourself: DevTools → Network tab → reload. Count the requests that aren't fonts. We'll wait.

$ stackblip --system-report

frameworknone — vanilla HTML, CSS & JS
dependencies0 runtime · 0 build-time
trackingnone — no analytics, no fingerprinting
cookies set0 by the tools themselves
your inputnever leaves the tab — provably
page weightlighter than one phone photo
build stepnone — view source, it's all there

$

who this is for

Built for the people actually on call.

> backend_dev Debugging a 401 at 2am? Decode the token, spot the expired exp claim, and get back to your night. JWT Decoder > devops_eng Is 0 5 * * 1 "Mondays at 5" or "the 1st, at 5"? Know before it pages you — the OR rule bites exactly once per career. Cron Builder > frontend_dev Your bug or the API's bug? Look up the code and find out whose fault this actually is — browser, server, or the CDN in between. Status Lookup > cs_student First open-source PR? Make the commit message the best part of it — conventional from day one, zero syntax anxiety. Commit Generator

faq

Fair questions, straight answers.

Anything else — the contact page is open.

Is Stackblip really free?

Yes. There's no paid tier and no plan to add one. The site may show a few unobtrusive ads eventually — that's the whole business model, and it stays out of your way.

Is it safe to paste sensitive data into these tools?

The tools run entirely in your browser — your input is never sent anywhere, which you can confirm in the network tab or the source code. That said, treat any pasted secret as sensitive on principle: your machine, your call.

Do I need to install anything?

No. No extension, no CLI, no npm install. Open a page and use the tool. Once loaded, most tools even keep working offline.

Which tools are available right now?

Five: a JWT decoder, a cron expression builder, a multi-hash generator, an HTTP status code lookup, and a conventional commit generator. Each one has its own page under Tools.

Can I suggest a tool?

Absolutely — that's what the contact page is for. If it's useful, runs client-side, and doesn't need your data, it's a candidate.

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Latest from the blog

Field notes on the stuff the tools solve — scroll for more →