Developer Tools

Explore our comprehensive collection of professional-grade developer tools calculators.

Developer Tools

4 units

JSON Formatter & Beautifier

Free online JSON formatter with pretty print, line numbers, dark mode, and large file support. Beautify, validate, and minify JSON instantly — no limits, no signup.

QR Code Generator

Free QR code generator — create QR codes for URLs, Wi-Fi, email, phone, and SMS. Custom colors, high-resolution PNG & SVG download. No signup, no watermark, works offline in your browser.

Fix Invalid JSON Online — Auto-Repair Tool

Automatically fix invalid JSON online. Repairs trailing commas, single quotes, Python True/False/None, unquoted keys, JS comments, and more. Free, instant, no signup.

JSON Validator Online — Free & Instant

Validate JSON online free. Instantly check syntax errors with exact line and column numbers, get fix hints for common mistakes, and see a full type breakdown of your JSON structure.