Developer Tools

This is where the day-to-day utility work of building software lives — formatting and validating JSON, decoding a JWT to see what's actually inside a token, generating UUIDs and ULIDs for database keys, testing a regular expression against real sample text before it ships, and converting between Base64 and plain text. Most of these tools solve a five-minute problem you'd otherwise handle by pasting data into a random website or writing a one-off script: checking what MIME type a file extension maps to, looking up an HTTP status code you half-remember, diffing two JSON payloads to spot what an API response actually changed, or calculating the numeric mode for a chmod command instead of counting on your fingers. A few are references rather than calculators — the Git and Regex cheatsheets exist because both tools have commands you use constantly and syntax you never quite memorize, so a fast lookup beats searching documentation every time.

Everything here runs entirely in your browser: pasting a JWT to decode it doesn't send that token anywhere, and testing a regex against a snippet of real (possibly sensitive) log data never leaves your machine. That's a deliberate difference from most JSON viewers and JWT debuggers online, many of which are built as thin wrappers around a server-side call. If you're debugging an API, wiring up authentication, or just need to know what a User-Agent string is telling you, this category is built to answer that in the time it takes to paste and read the result.