DevBox – JSON Formatter, JWT Decoder & Developer Tools

Sleek developer toolbox with JSON Formatter, JWT Decoder, Color Picker, Regex Tester, HTML Preview, and other offline utilities.

DevBox – JSON Formatter, JWT Decoder & Developer Tools 🚀 Stop cluttering your browser with dozens of tabs for single-purpose utilities. DevBox is a premium, offline-first, all-in-one developer workspace designed to streamline your daily workflow. Packed with 14 essential tools inside a beautiful glassmorphic interface, DevBox is the ultimate utility belt for web developers, software engineers, and designers. 🛠️✨ 🔒 Privacy-First & Offline-Ready DevBox runs 100% locally in your browser. None of your data, code snippets, JSON payloads, or secret keys ever leave your machine. No APIs, no servers, no telemetry, and zero data collection. 🌟 Core Features 🎨 Dynamic Theme Engine: Toggle between a premium Dark Theme, a clean Light Theme, or sync in real-time with your OS System default color scheme. 💾 Smart State Persistence: DevBox remembers which tab you were working on and restores your inputs when you reopen the popup. ⚡ 0ms Latency: Zero external dependencies make the popup open instantly and perform computations in milliseconds. 📱 Scrollable Sidebar Navigation: Easily access all tools via a scrollable toolbar while keeping the DevBox header pinned. 🧰 The 14 Essential Tools Included: ✨ JSON Formatter & Validator Format JSON payloads with 2-space or 4-space indentations. Minify JSON strings for production bundles. Real-time syntax validation with clear success/error status badges. 🔒 JWT Decoder Decode JSON Web Tokens instantly. Inspects JWT Header, Payload, and Signature in clean, syntax-highlighted blocks. 🔑 Base64 Encoder/Decoder Encode plain text to Base64 strings or decode Base64 back to raw text. ⏰ Unix Timestamp Converter Convert Unix epoch timestamps to human-readable local dates. Fetch the current epoch timestamp with one click. Supports dynamic switching between Seconds (s) and Milliseconds (ms). 🎨 Native Color Picker Invokes Chrome's native EyeDropper API using a smart web banner. Popup auto-closes so you can select any color behind it, copies hex values to your clipboard, and automatically reopens. 🔍 Regex Tester Test regular expressions dynamically as you type. Toggle flags (g, i, m) and view highlighted matches alongside captured groups and position indices. 🔗 URL Encoder/Decoder Percent-encode URL strings or decode encoded query parameters instantly. 🆔 UUID Generator Generate random v4 UUIDs in batches (1, 5, 10, or 20). Options to force uppercase formatting and toggling hyphen separators. 🛡️ Hash Generator Calculate cryptographic hashes locally using Web Crypto. Generates SHA-256, SHA-512, and SHA-1 signatures concurrently as you type. 🔤 HTML Entity Encoder/Decoder Escape HTML tags (<, >, &, ") to safe entities or decode them back to plain code. ✍️ Lorem Ipsum Generator Generate custom mock text by Paragraph, Sentence, or Word counts. 💻 HTML Live Preview Render raw HTML and inline CSS instantly inside a secure, sandboxed iframe. ⚖️ Diff Checker (Text Compare) Compare two text files side-by-side. Visually highlights line-by-line additions (green) and deletions (red). 📝 Markdown Preview Draft Markdown syntax and compile it live into styled, readable HTML. 🎯 Who is DevBox for? Web Developers & Engineers who format JSON payloads, inspect JWT auth tokens, and decode Base64 strings daily. UI/UX Designers who need a quick Eyedropper tool to sample screen colors or generate Lorem Ipsum placeholders. QA Testers validating API response times, Unix timestamps, and regex expressions. DevBox is completely free, secure, and ready to use. Keep your browser clean and keep your data safe. Add DevBox to Chrome today! 💎