Free · browser-based

Fast, focused tools for small developer tasks.

DevBox is a growing cluster of developer utilities that run entirely in your browser. Pick a tool below to get started.

AvailableJSONView JSON as a tree, format, beautify, minify and validate it — with every error explained in plain English.AvailableEncoding & decodingEncode Base64, URL components and HTML entities, or inspect JWT claims — entirely in your browser.Coming soonCSS & frontendPX/REM/EM conversion, clamp, aspect ratio, and contrast utilities.

Start with the JSON formatter or browse the encoding tools — IDs and timestamp tools are on the way.