About

DevsBox is a focused collection of browser-based tools for engineers who need to format, decode, hash, validate, or compare small chunks of code and data many times a day. Each tool is built around a single workflow — paste in, transform, copy out — so the page does not get in the way when you are mid-task.

Every transformation runs locally in the browser using standard Web APIs. Pasted JSON, JWTs, environment files, regex patterns, hash inputs, and SQL snippets stay on your machine; nothing is sent to a server, logged, or stored remotely. That matters when the text you are debugging includes API keys, internal identifiers, customer payloads, or credentials you would not want to ship through a third-party SaaS just to pretty-print a response.

The current toolset includes a JSON formatter and validator with sibling routes for common conversions (CSV, YAML, XML, TypeScript), a JWT decoder, base64 and URL encoder/decoders, MD5 and SHA-256 hashers, a regex tester, a UUID generator, an XML and SQL formatter, a markdown editor, and a diff checker. Each tool ships with realistic sample inputs, copy-link state, and short reference notes so you can hand a teammate a URL that reproduces what you just saw. The JSON formatter handles arbitrarily large documents (subject to browser memory) and reports both syntax errors with line numbers and structural ambiguities such as duplicate keys at the same nesting level. The JWT decoder splits header, payload, and signature into separate panes, decodes the standard registered claims (iat, exp, nbf, iss, aud, sub) into human-readable dates and labels, and clearly marks the signature as unverified — DevsBox cannot verify a JWT without access to the issuer’s key material and does not attempt to.

The site is maintained as part of a small portfolio of single-purpose utility sites published by the inovisum team. It is funded by display advertising served through Google AdSense; revenue keeps the tools free, fast, and free of upsells, paywalls, and forced sign-ups. There is no account system, no usage quota, and no feature gated behind a premium tier. If a tool you rely on is missing or behaves unexpectedly, send a short note to hhammoud@inovisum.com and it will be triaged on the next maintenance pass.