The latest articles on DEV Community by mohamedp09 (@mohamedp09). https://dev.to/mohamedp09 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%2F3520872%2F462b0547-6be5-4309-8683-06bf4f4ec713.png https://dev.to/mohamedp09 en mohamedp09 Sun, 15 Mar 2026 06:19:48 +0000 https://dev.to/mohamedp09/the-cursorrules-file-i-wish-i-had-when-building-my-saas-5c5p https://dev.to/mohamedp09/the-cursorrules-file-i-wish-i-had-when-building-my-saas-5c5p <p>I've been using Cursor to build a Node.js + TypeScript SaaS, <br> and it's genuinely impressive — until it isn't.</p> <p>The frustrations were always the same:</p> <ul> <li>Silent catch blocks with no logging</li> <li>any types slipping through everywhere</li> <li>Inconsistent API responses (sometimes data, sometimes <code>result</code>)</li> <li>Prisma queries without proper error handling</li> <li>Hardcoded secrets instead of environment variables</li> </ul> <p>I kept correcting the same mistakes over and over. <br> So I did what any developer would do — I wrote rules.</p> <h2> What is .cursorrules? </h2> <p>A .cursorrules file sits in your project root and tells <br> Cursor how to behave in YOUR codebase. Think of it as a <br> style guide that the AI actually reads and follows.</p> <p>The difference is dramatic.</p> <p>Without rules:</p> <div class="highlight js-code-highlight"> <pre class="highlight plaintext"><code> typescript // Cursor generates this try { const user = await db.user.findFirst({ where: { id } }); return user; } catch (e) { // silent catch — the bug graveyard } 👉 Available here: https://mohamedp2.gumroad.com/l/ruxmq Drop it in your project root and Cursor starts following your conventions immediately. No npm install, no config — just copy the file. What rules do you have in your .cursorrules? Would love to see what others are doing. </code></pre> </div> ai productivity tooling typescript