The latest articles on DEV Community by mg x (@mg_x_9532a1c112cb2e04e2e4). https://dev.to/mg_x_9532a1c112cb2e04e2e4 https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https:%2F%2Fdev-to-uploads.s3.us-east-2.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F4084320%2F728eb707-0314-4d66-8aaf-1fc5c347c451.jpg https://dev.to/mg_x_9532a1c112cb2e04e2e4 en mg x Wed, 19 Aug 2026 05:29:44 +0000 https://dev.to/mg_x_9532a1c112cb2e04e2e4/why-i-built-a-100-in-browser-privacy-developer-toolbox-json-base64-sql-time-3e9n https://dev.to/mg_x_9532a1c112cb2e04e2e4/why-i-built-a-100-in-browser-privacy-developer-toolbox-json-base64-sql-time-3e9n <p>As web developers, our daily workflow is filled with micro-tasks: formatting a messy JSON payload, checking a Unix timestamp, decoding a Base64 string, or converting JSON arrays into a CSV sheet.</p> <p>However, almost every popular tool on Google comes with two frustrating issues:</p> <ol> <li><strong>Intrusive ads and slow page bloat.</strong></li> <li> <strong>Data privacy risks:</strong> Many online formatters send your sensitive tokens, customer IDs, and database queries to their backend servers for parsing.</li> </ol> <p>To solve this, I built <strong><a href="https://tool.lehuoliaoyu.com" rel="noopener noreferrer">ToolHub</a></strong> – a lightweight, fast, and 100% client-side developer utility suite.</p> <h3> 🔒 Core Architecture: 100% In-Browser Computation </h3> <p>Every tool on ToolHub executes purely inside the browser sandbox using client-side JavaScript Web APIs and Web Workers:</p> <ul> <li> <strong>Zero Server Uploads</strong>: Your payload never leaves your local machine. You can even disconnect from the internet after loading the page and every tool will still work flawlessly.</li> <li> <strong>Sub-Second Static Speed</strong>: Built with Next.js 14 static generation and Tailwind CSS for instant load times.</li> <li> <strong>Dark Mode by Default</strong>: Engineered specifically for developers working in modern IDE setups.</li> </ul> <h3> 🛠️ Current Toolbox Overview: </h3> <ol> <li> <strong>JSON Utilities</strong>: <ul> <li> <a href="https://tool.lehuoliaoyu.com/json" rel="noopener noreferrer">JSON Formatter &amp; Validator</a> with syntax error diagnostics.</li> <li> <a href="https://tool.lehuoliaoyu.com/json-to-csv" rel="noopener noreferrer">JSON to CSV Converter</a> with nested object flattening.</li> <li> <a href="https://tool.lehuoliaoyu.com/json-minifier" rel="noopener noreferrer">JSON Minifier</a>.</li> </ul> </li> <li> <strong>Encoders &amp; Decoders</strong>: <ul> <li> <a href="https://tool.lehuoliaoyu.com/base64-encode-decode" rel="noopener noreferrer">Base64 Encode/Decode</a> &amp; <a href="https://tool.lehuoliaoyu.com/image-to-base64" rel="noopener noreferrer">Image to Base64</a> with live image previews.</li> </ul> </li> <li> <strong>Code &amp; Database Tools</strong>: <ul> <li> <a href="https://tool.lehuoliaoyu.com/sql-formatter" rel="noopener noreferrer">SQL Formatter</a> supporting standard ANSI SQL syntax.</li> </ul> </li> <li> <strong>Time &amp; System Utilities</strong>: <ul> <li> <a href="https://tool.lehuoliaoyu.com/timestamp-converter" rel="noopener noreferrer">Unix Timestamp / Epoch Converter</a> with UTC/Local timezones.</li> <li> <a href="https://tool.lehuoliaoyu.com/uuid-generator" rel="noopener noreferrer">UUID / GUID Generator</a> and <a href="https://tool.lehuoliaoyu.com/regex-tester" rel="noopener noreferrer">Regex Tester</a>.</li> </ul> </li> </ol> <h3> 🚀 Try It Out &amp; Share Your Feedback </h3> <p>The project is completely free with zero mandatory sign-up:<br> 👉 <strong>Live URL</strong>: <a href="https://tool.lehuoliaoyu.com" rel="noopener noreferrer">https://tool.lehuoliaoyu.com</a></p> <p>I would love to hear your thoughts on what niche developer tools I should build next! (e.g. JWT Debugger, Cron generator, or JSON to TypeScript?)</p> webdev javascript opensource productivity