The latest articles on DEV Community by Priyanka Patel (@priyanka_patel_a0f967ebf5). https://dev.to/priyanka_patel_a0f967ebf5 https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https:%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F3949406%2F3c63c384-431b-4b41-ab7b-f0daff1978b1.png https://dev.to/priyanka_patel_a0f967ebf5 en Priyanka Patel Sun, 24 May 2026 18:25:27 +0000 https://dev.to/priyanka_patel_a0f967ebf5/why-i-built-a-privacy-first-dev-toolkit-3jke https://dev.to/priyanka_patel_a0f967ebf5/why-i-built-a-privacy-first-dev-toolkit-3jke <p>A few months ago, I was debugging a production API issue. I copied a JWT from our logs, pasted it into an "online decoder," and immediately felt sick.</p> <p><strong>I had just sent a live production token to a stranger's server.</strong></p> <p>That moment led to <a href="https://toolsmania.app" rel="noopener noreferrer">ToolsMania</a> — a suite of developer and finance tools that run <strong>entirely in your browser</strong>. No server. No database. No data retention.</p> <h2> The Problem with "Free" Online Tools </h2> <p>Most online utilities are free because <em>you</em> are the product. Your inputs are logged, analyzed, and sometimes leaked. For developers handling:</p> <ul> <li>JWTs with production claims</li> <li>API keys and tokens</li> <li>Proprietary SQL queries</li> <li>Financial calculations with real numbers</li> </ul> <p>...this is unacceptable.</p> <h2> What's Inside ToolsMania </h2> <h3> For Developers </h3> <ul> <li> <strong>SmartParser</strong> — Paste any mystery string. Auto-detects Base64, JWT, Hex, URL-encoding, JSON, XML, CSV.</li> <li> <strong>API Studio</strong> — A Postman alternative that runs in-browser. Import cURL, test endpoints, export code to Python/Node/Go/PHP.</li> <li> <strong>JWT Decoder</strong> — Instant payload inspection. Zero network requests.</li> <li> <strong>JSON Formatter</strong> — Interactive tree view, validation, minify/beautify.</li> <li> <strong>SQL Formatter</strong> — Supports MySQL, PostgreSQL, SQLite.</li> <li> <strong>Regex Tester</strong> — Real-time matching with plain-English explanations.</li> <li> <strong>Cron Generator</strong> — Next execution times in your timezone.</li> </ul> <h3> For Financial Planning </h3> <ul> <li> <strong>Compound Interest Calculator</strong> — Interactive charts, year-by-year breakdown.</li> <li> <strong>Mortgage &amp; Loan Calculators</strong> — Amortization schedules, extra payment analysis.</li> <li> <strong>EMI Calculator (India)</strong> — Tailored for Indian bank rates.</li> <li> <strong>Debt Payoff Planner</strong> — Avalanche vs. Snowball methods.</li> </ul> <h2> 100% Client-Side Architecture </h2> <p>Every computation uses WebAssembly and modern browser APIs. When you close the tab, your data vanishes. We couldn't read it if we wanted to.</p> <h2> Try It </h2> <p><a href="https://toolsmania.app" rel="noopener noreferrer">ToolsMania.app</a></p> <p>No signup required. No catch. Just tools that respect your privacy.</p> <p><em>Have you ever accidentally leaked sensitive data to an online tool? Let's discuss in the comments.</em></p> webdev opensource tooling devops