Hey devs,
I built DevTools.live — a free, no-login developer toolkit that runs entirely in your browser. Nothing is sent to any server. Ever.
What's inside (8 tools):
JSON Formatter & Validator
Paste messy JSON, get it back clean. Tree view, syntax highlighting, error detection with line numbers. Keyboard shortcuts for power users.
JSON Diff (just launched)
Paste two JSON objects side-by-side and instantly see what changed — added keys (+), removed keys (−), modified values (~). Works on deeply nested objects. Swap panels in one click.
JWT Decoder
Decode any JWT token — see the header, payload, and expiry at a glance. No keys, no signature verification needed.
Base64 Encoder / Decoder
Encode or decode Base64 strings instantly. Supports URL-safe encoding.
Regex Tester
Write a regex, paste your test string, see live match highlighting. Flags selector included.
Timestamp Converter
Paste a Unix timestamp, get human-readable date/time in any timezone. Works backwards too.
Color Picker & Converter
Convert between HEX, RGB, HSL, and HSB. Generates shade palettes. Visual color picker included.
UUID Generator
Generate UUID v4, v1, and v7 in bulk. Copy single or download all as a file.
QR Code Generator
Turn any URL, text, Wi-Fi credentials, or vCard into a QR code. Download as PNG or SVG.
Why I built it:
Every time I needed a quick JSON diff or UUID, I'd end up on some sketchy site with ads, paywalls, or worse — uploading sensitive tokens to unknown servers. DevTools.live is 100% client-side. Your data never leaves your browser tab.
Link: https://jsonviewer.live
Would love feedback on what tool to add next — thinking CSV→JSON, cron expression parser, or color contrast checker.
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