The most useful free online tools for developers
Wael Sabra
Free web tools I use every week for formatting, testing and debugging.
You do not need expensive software to be productive. These free online tools are bookmarked in my browser and used almost daily.
A JSON formatter and validator saves me whenever an API returns a wall of text. A regex tester with live explanations makes regular expressions far less scary, and a colour-contrast checker keeps my designs accessible.
For quick experiments I use an online code playground, and for APIs a request builder in the browser. Add an image compressor and a diff checker, and you have a toolkit that covers most everyday tasks.