Online regular expression tester for Python, PHP, Ruby, JS, Java and MySQL. Regex visualizer. Syntax highlighting. Cheatsheet. Generate string corresponding to a regex.

Merge two YAML files seamlessly with this free online YAML merger. Simple, fast, and easy to use, no registration or downloads required.

Free and open-source fake API to test and prototype. It allows you to instantly generate a fully functional API from any JSON object. You can create rules to handle errors and customize HTTP codes, headers, and responses. The tool is completely free to use, and you can access the source code to run it locally.

Test, validate, and visualize SQL regular expressions with ease. Explore an interactive tool to test SQL regex patterns, and validate expressions.