I Built 121+ Free Browser-Based Dev Tools — Here Are My 10 Favorites

Source: Dev.to

Every developer has a set of small utilities they reach for daily — decoding a JWT, formatting JSON, generating UUIDs, testing regex patterns. Most of these tasks don’t need a full IDE or installed software. So I built Filuni — a free, browser-based toolkit with 121+ tools across 12 categories. Here are my 10 favorites for developers: Paste a JWT token, instantly see the decoded header and payload. No more copy-pasting to jwt.io. Try it: filuni.com/filetool/dev/dev-jwt Paste messy JSON, get it beautifully formatted with syntax highlighting. Instantly validates and shows error locations with line numbers. Try it: filuni.com/filetool/json/json-format Generate UUID v4 in bulk — 1 to 100 UUIDs at once with one click. Try it: filuni.com/filetool/dev/dev-uuid Write regex patterns and test them against sample text with real-time match highlighting. Try it: filuni.com/filetool/text/text-regex Enter a cron expression and see a human-readable description plus the next 10 run times. Try it: filuni.com/filetool/dev/dev-cron Structurally compare two JSON objects and see added/removed/changed keys highlighted. Try it: filuni.com/filetool/dev/dev-json-diff Paste a cURL command and get equivalent code in fetch, axios, or Python requests. Try it: filuni.com/filetool/dev/dev-curl Beautify or minify HTML, CSS, JavaScript, and SQL with one click. Try it: filuni.com/filetool/dev/dev-beautifier Enter a CIDR notation and get network address, broadcast, netmask, and usable host range. Try it: filuni.com/filetool/dev/dev-cidr Convert numbers between binary, octal, decimal, hex, and any base 2-36. Try it: filuni.com/filetool/dev/dev-base-convert Filuni also has 100+ tools for: PDF — merge, split, compress, convert to Word/Excel/Image Image — compress, resize, crop, QR codes, watermark, EXIF viewer Video — compress, convert, extract audio, make GIFs Text — word counter, diff, case converter, Markdown preview Encryption — AES/RSA encrypt, hash generate, Base64 Color — picker, gradient builder, WCAG contrast checker Calculators — BMI, loan, compound interest, statistics No install — works on any machine, even a Chromebook Always up-to-date — no version management Privacy — most tools run 100% client-side Cross-platform — same tool on Windows, Mac, Linux, mobile All 121+ tools are free at filuni.com, no signup required. What dev tools do you use daily? Drop a comment!