About DevTools Hub

What this is

DevTools Hub is a collection of 8 single-purpose tools for the jobs that interrupt a working day: pretty-printing a JSON payload, decoding a token to see why a request was rejected, checking what a cron expression will actually do, converting a manifest between YAML and JSON.

Each one lives on its own page with the tool at the top and a short explainer, worked examples and a FAQ below it, so the page answers the follow-up question as well as the immediate one.

How it works

Every tool is implemented in JavaScript that runs in your browser tab. There is no backend API, no database and no account system. When you paste a JWT into the decoder, the decoding happens on your machine; the token is never transmitted anywhere. The same is true of every other tool on the site.

A practical consequence is that the tools keep working offline once a page has loaded, and they respond as fast as you can type, because there is no network round trip between input and output.

How it is paid for

The site is funded by advertising. Ad slots are placed below or beside the tool, never in front of it, and their space is reserved in the layout from the first paint so nothing jumps around as you work. There is no paid tier, and no feature is withheld behind one.

The tools

• JSON Formatter — Format, validate and minify JSON
• Base64 Encoder / Decoder — Encode and decode Base64 and Base64URL
• UUID Generator — Generate and inspect UUIDs (v4, v7, nil)
• Timestamp Converter — Convert Unix time to dates and back
• JWT Decoder — Decode and inspect JSON Web Tokens
• Regex Tester — Test regular expressions with live match highlighting
• Cron Parser — Explain cron expressions and preview next runs
• YAML ⇄ JSON Converter — Convert between YAML and JSON

Feedback

Built and maintained by Zeeshan Imdad. If a tool gets something wrong, or there is one you keep wishing were here, email zeeshanimdad1614@gmail.com.