This is a curated list of websites to test code and prototype your projects on-the-fly
CodePen
Online code editor, learning environment, and community for front-end web development using HTML, CSS and JavaScript code snippets, projects, and web applications.
CodeSandbox
This is an online code editor and prototyping tool that makes creating and sharing web apps faster.
Carbon
The easiest and fastest way to create and share beautiful images of your source code.
CSS-Tricks
A collection of code snippets for web developers, including code for HTML, CSS, JavaScript, PHP, WordPress, jQuery, HTAccess, and more!
30 seconds of code
Short code-snippets for all your development needs, including JavaScript, CSS, React, Python, and more!
Start Bootstrap
Trusted by tens of millions of users worldwide, Start Bootstrap develops website themes, templates, snippets, and more to help you get started on your next project!
useHooks
This website provides easy to understand code examples to help you learn how hooks work and inspire you to take advantage of them in your next project.
Code to go
Find updated snippets for common JavaScript use cases.
Bootsnipp
A design element gallery for web designers and web developers. Find snippets using HTML, CSS, Javascript, jQuery, and Bootstrap.
Hope you'll find these resources useful and develop great stuff!