Developer Tools
Free Online Developer Tools
Essential utilities engineered for software engineers, API developers, and data specialists.
QR Code Generator
Generate high-resolution custom QR codes for URLs, text, Wi-Fi networks, emails, and phone numbers instantly.
QR Code Generator
JSON Formatter & Validator
Format, beautify, minify, and validate JSON data with instant syntax error locating and tree view.
JSON Formatter & Validator
Regex Tester & Debugger
Test, validate, and debug regular expressions in real-time with match highlighting and capture group inspection.
Regex Tester & Debugger
URL Encoder / Decoder
Encode and decode URLs, query strings, and percent-encoded characters instantly in your browser.
URL Encoder / Decoder
FAQ
Frequently Asked Questions
Is it safe to paste proprietary JSON or API responses?
Yes. The JSON Formatter and developer tools run entirely in your local browser sandbox. No input is ever sent over the network or saved anywhere.
Does the validator show the exact line of syntax errors?
Yes. Our validator inspects the error pointer and displays exact line and column numbers to help you fix syntax problems instantly.