Dev Tools: JSON, JWT, Regex

Dev Tools is an offline developer toolkit built for programmers, students, and tech professionals who need fast, reliable utilities without switching between multiple apps or relying on internet access. Whether you're debugging JSON, decoding a JWT token, or managing reusable code snippets, this developer tools app puts everything in one clean interface.

Key Features of Dev Tools: JSON, JWT, Regex

🔧 Core Developer Utilities

Use the built-in JSON formatter to instantly beautify, minify, and validate JSON data — useful for API testing, debugging responses, and cleaning up messy payloads. The app also includes a fast JWT decoder that breaks JSON Web Tokens into header, payload, and signature sections, so you can inspect claims and debug authentication issues without pasting sensitive tokens into an online JWT decoder (everything stays on your device).

Need to process encoded data? Dev Tools includes Base64 encoding/decoding, URL encoding/decoding, and Hex conversion tools, all in one place. Pair that with a built-in regex tester to instantly validate and debug regular expressions against sample strings — no more guessing whether your pattern matches.

🎨 Design & Accessibility Tools

Beyond core coding utilities, Dev Tools includes handy design tools: a color converter for switching between HEX, RGB, and HSL formats, plus a WCAG contrast ratio checker to make sure your app or website text meets accessibility standards. These tools save designers and frontend developers from jumping to a browser every time.

📁 Snippet Manager with Full-Text Search

Stop losing useful code in scattered notes files. The built-in code snippet manager lets you save, organize, and tag snippets locally, with fast full-text search (powered by Room FTS4) so you can find exactly what you need in seconds. It's a lightweight, offline alternative to cloud-based snippet tools — great for storing boilerplate, regex patterns, config templates, and more.

📱 Device Diagnostics

Check hardware specs and get a quick system health report right from the app — useful for developers testing on real devices or troubleshooting performance issues.

🔒 Offline & Privacy-First

Dev Tools app works offline. Every JSON formatter, JWT decoder, Base64 tool, and snippet you save stays on your device, never uploaded anywhere. For extra security, enable the optional biometric app lock to keep your saved snippets and data private.

Whether you're a mobile developer, backend engineer, student learning to code, or QA tester who needs quick offline access to essential developer tools, Dev Toolbox is designed to be fast, lightweight, and genuinely useful — every single day.

Download Dev Tools today — your offline developer toolkit