About Developer Toolbox
Developer Toolbox is a collection of 15 fast, browser-based utilities for everyday development work: formatting JSON and SQL, decoding JWTs, generating UUIDs, testing regular expressions, converting timestamps and data formats, and more.
Our mission is simple: make everyday developer tasks faster. No sign-ups, no uploads, no waiting — open a tool and get your answer.
Everything is built around one core philosophy: your data should stay yours. Whenever technically possible, processing happens entirely in your browser using native web APIs. Your payloads, tokens, queries, and secrets never touch our servers.
What we value
- Privacy by architecture. Client-side processing isn't a feature toggle — it's how the tools are built.
- Speed. Tools load fast and heavy libraries are only loaded on the pages that need them.
- Correctness. Tools use the same engines your code uses: the native JSON parser, the browser's RegExp engine, and the Web Crypto API.
- No accounts. Preferences like theme and favorites live in your browser's local storage — nowhere else.