Free Online Developer Tools

Essential utilities engineered for software engineers, API developers, and data specialists.

Format, beautify, minify, and validate JSON data with instant syntax error locating and tree view.

Test, validate, and debug regular expressions in real-time with match highlighting and capture group inspection.

Encode and decode URLs, query strings, and percent-encoded characters instantly in your browser.

Generate high-resolution custom QR codes for URLs, text, Wi-Fi networks, emails, and phone numbers instantly.

Decode and inspect JSON Web Tokens locally without sending secret tokens over the network.

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.