The latest articles on DEV Community by Julien Fourel (@fioul). https://dev.to/fioul 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%2F3601578%2Fec4a43aa-bf7f-415a-8269-255abae54e84.png https://dev.to/fioul en Julien Fourel Fri, 07 Nov 2025 15:47:38 +0000 https://dev.to/fioul/fastminify-free-client-side-jscss-minifier-2o87 https://dev.to/fioul/fastminify-free-client-side-jscss-minifier-2o87 <p>I built <strong><a href="https://fastminify.com" rel="noopener noreferrer">FastMinify</a></strong>, a free, privacy-first developer toolbox that runs entirely in your browser — paste, upload, copy. No signup, and your code never leaves your device.</p> <p>What started as a JS/CSS minifier has grown into <strong>165+ tools</strong> across minify, beautify, unminify, format, validate, convert, and everyday dev utilities.</p> <p><strong>Highlights:</strong></p> <ul> <li> <strong>Minify family</strong> — JS, CSS, HTML, JSON, XML, SVG, YAML, TOML, SQL, and more</li> <li> <strong>Three compression levels</strong> (Conservative / Normal / Aggressive) on minify tools</li> <li> <strong>ES5 → ES2022</strong> output targets for JavaScript minification</li> <li> <strong>50+ format converters</strong> — JSON ↔ YAML/XML/CSV/TOML/Properties/INI, Markdown, SQL, and more</li> <li> <strong>Validate &amp; lint</strong> — JSON Schema, OpenAPI, GraphQL SDL, Docker Compose, <code>.env</code>, Kubernetes manifests, NDJSON logs…</li> <li> <strong>DevOps &amp; infra</strong> — Terraform/HCL, Dockerfile, GitHub Actions, GitLab CI</li> <li> <strong>Security &amp; tokens</strong> — JWT encode/decode/verify, JWKS inspect, PEM/JWK, secret scanning, bcrypt</li> <li> <strong>Developer utilities</strong> — UUID/ULID/Nanoid, cron parser, regex tester, password generator, text diff, subnet calculator…</li> <li> <strong>Monaco editor</strong> on minify and converter pages — syntax highlighting, keyboard shortcuts (<code>⌘K</code> site search, <code>?</code> cheatsheet)</li> <li> <strong>100% client-side</strong> — no server-side processing of your input</li> <li><strong>UI in English, French, and German</strong></li> <li> <strong>Installable PWA</strong> — use FastMinify like a desktop app, even offline for many tools.</li> </ul> <p>Built with <strong>Next.js 15</strong>, <strong>Terser</strong>, <strong>CSSO</strong>, and a growing set of browser-side libraries — all lazy-loaded where it matters for performance.</p> <p>The toolbox keeps growing with new developer tools and format support every week.</p> <p><strong><a href="https://fastminify.com" rel="noopener noreferrer">fastminify.com</a></strong> · <a href="https://fastminify.com/en/tools" rel="noopener noreferrer">All tools</a> · <a href="https://fastminify.com/en/blog" rel="noopener noreferrer">Blog</a></p> <p>Hope it saves you a trip to five different tabs on your next debug session!</p> minify devtool privacy nextjs