300+ Dev Tools, Zero Servers: Building a 100% Client-Side Offline Workstation For Free

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Every software engineer knows the ritual: you need to decode a JWT token, format a messy 500-line JSON payload, test a regex, or hash an API key.

What do you do? You open Google, click the first search result, and paste your data.

A few months ago, I paused before pasting a production authorization payload into a random online decoder. I opened DevTools Network tab on that site and watched in disbelief as it fired a POST request with my decoded header and claims straight to an unknown analytics and tracking server.

Think about what engineers routinely paste into random web utilities:

  • Auth headers with active Bearer tokens
  • Database connection strings and SQL dumps
  • Sensitive company API payloads
  • Private keys and SSL certificates

Most of the popular "free online developer tools" are riddled with ad scripts, tracking beacons, cookie consent popups, or hidden backends.

I decided I had enough of...

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