DEV Community: Harshit Bagauli

Free JSON Formatter, Diff, JWT, Regex, UUID & more (100% client-side)

Harshit Bagauli — Fri, 19 Jun 2026 11:58:34 +0000

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.

I built a free multi-tool dev suite that runs 100% in your browser — no signup, no data sent anywhere

Harshit Bagauli — Mon, 15 Jun 2026 02:53:10 +0000

Hey r/webdev,

Sick of juggling 8 different websites to format JSON, decode a JWT,
test a regex, or convert a timestamp? I built one place for all of it.
🔗 https://jsonviewer.live

jsonviewer.live — 8 tools in one:

• { } JSON Formatter & Tree Explorer — format, validate, search keys/values
• 🔑 JWT Decoder — decode header/payload, verify HMAC-SHA256 signatures
• ⇄ Base64 Encoder/Decoder — standard + URL-safe, file upload support
• .* Regex Tester — live match highlighting, match table with groups
• 🕐 Unix Timestamp Converter — all formats, any timezone, relative time
• 🎨 Color Picker — HEX/RGB/HSL/HSB, shade generator, WCAG contrast checker
• # UUID Generator — v4/v1/v7, bulk generation, download as .txt or .json
• ▦ QR Code Generator — URL, Wi-Fi, vCard, email, SMS — download PNG/SVG

🔗 https://jsonviewer.live

What makes it different:

Zero backend. Everything runs in your browser — paste sensitive tokens, internal configs, private data without worrying where it goes
Works offline after first load
Dark + light mode
Mobile friendly

It's fully open source. Would love feedback on what tools to add next.

🔗 https://jsonviewer.live

I built a free JSON Viewer that never uploads your data — here's how

Harshit Bagauli — Sun, 14 Jun 2026 11:47:31 +0000

As a developer, I constantly paste JSON into online tools — but always felt uncomfortable about where that data was going. So I built JSON Viewer Pro.

What it does
Paste JSON → instant collapsible tree view
Click any node → get the JSONPath ($.user.address.city)
Search across all keys and values
Format or minify with one click
Dark & light theme
The privacy angle
The entire app is a single HTML file served from Cloudflare. There is no backend, no database, no analytics. Your JSON is processed entirely in your browser using JSON.parse().

Try it
https://jsonviewer.live

Built with vanilla JS, no frameworks. Happy to answer questions in the comments!