I Built 56 Developer Tools With Zero Dependencies — Here's What I Learned

I kept opening random websites for small tasks — formatting JSON, decoding JWTs, converting timestamps, generating UUIDs. Different sites, different UX, most wanting sign-ups or tracking everything. So I built devprix.dev — 56 developer tools that all run in your browser. Nothing sent to any server. Zero npm dependencies for any tool logic. The Full Tool List Formatters & Validators JSON Formatter (beautify, minify, tree view) SQL Formatter (6 SQL dialects) Regex Tester (live highlighting, pattern library) JWT Decoder (header/payload/signature, expiry check) Cron Expression Parser (visual builder, next run times) JSON Path Evaluator & JSON Validator Generators UUID Generator (v1, v3, v4, v5, v7) Password & Key Generator (RSA, ECDSA, Ed25519 key pairs) QR Code Generator (URL, WiFi, vCard — encoder built from scratch) Test Data Generator (55+ field types) Hash Generator (MD5, SHA-1/256/384/512, HMAC) Converters Timestamp / Epoch Converter (80+ timezones) Base64 Encoder/Decode