I Built 39 Developer Tools in 10 Days — No Backend, No Tracking, No Ads

I Built 39 Developer Tools in 10 Days — No Backend, No Tracking, No Ads Every developer has that moment: you need to format some JSON, generate a UUID, or check an HTTP status code, and you end up on a site covered in ads with cookie banners and trackers. Your data gets sent to some server you don't control. For a 2-second task. I got tired of it. So I built ToolNexus — 39 developer tools that run 100% in your browser . No backend. No tracking. No ads. Your data never leaves your device. What I Built 39 tools across 6 batches, covering the most common developer tasks: Text & Code JSON Formatter (tree view, auto-repair, sort keys) SQL Formatter (custom tokenizer, syntax highlighting) Markdown Preview (custom parser, 0 dependencies) Regex Tester (live highlighting, capture groups) Diff Checker (LCS algorithm, ignore options) Text Case Converter (11 formats: camelCase, snake_case, etc.) Character Counter (words, sentences, bytes, reading time) Encoding & Security Base64 Encoder/Decoder UR