10 Websites to Test Your Codes Online

The way web developers can build has been fundamentally altered by contemporary trends and webapps. The requirement for an IDE is obvious if you want to code new files and save them for deployment. How about simply testing your code samples? Today, there are more tools than ever before!

I’ll list 10 fun web applications in this article that you may use to test your code online. All of these programmes need to be connected to the Internet, and several of the more sophisticated editors have pro plans that let you improve your account’s features. But, the majority of these tools will undoubtedly be useful when you’re rushing to debug a JavaScript or PHP block.

10 Best Free Source Code Editors

10 Best Free Source Code Editors

It’s not surprising that more and more individuals are using professional code editors, such as Dreamweaver, Coda, Textmate, and others.


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Jsbin is a straightforward JavaScript debugging console, similar to the one described above. In their proposal, they talk about writing together in real time via a private link that you can share with other devs.

For new users, their interface could be a little complicated. If you’re interested, you can browse through some online tutorials that the developers have set up. Fundamentally, there are dozens of JS libraries to pick from, like jQuery, JQuery UI, jQM, Prototype, and MooTools.


Drafts will automatically save as you change the code for various elements. You have the choice of downloading your finished project or online archiving of the source code. Their approach for exporting and maintaining your code as a blank template is far more sophisticated.

Everyone who has perused Stack Overflow must be familiar with jsFiddle. Its interface differs greatly from JSBin’s, and they also support more advanced functionalities.

You can create a free account right away and start storing your code samples online. You can share the short URL that jsFiddle provides on Twitter, Facebook, and even Stack. But take note—you don’t need a user account to begin programming. Just an efficient feature to keep everything in order.


Libraries like Prototype and jQuery are also supported by jsFiddle. Each testing document can contain extra external resources in addition to JavaScript and CSS files.


CodePen is more of a social network than a simple coding environment for Web developers. Not only can we view people’s sharing of HTML, CSS, and JavaScript codes, known as “Pens,” but we can also “Like” a Pen, leave a remark, compile a collection of Pens, publish a post, and participate in challenges to advance our Web development expertise.

A completely functional JavaScript playground is Codesandbox. You can execute a functioning Node.js application in addition to Vanilla JavaScript code or a framework like React.js, Vue.js, or Svelte. It means that the package.json file allows you to specify the dependencies for Node.js. Depencies from NPM will be downloaded automatically by Codesandbox. Also, you get access to a web-based Terminal through which you may execute any NPM scripts directly from your browser.


To find cool stuff created in CodeSandbox, visit the Explore tab.


A code playground for HTML, CSS, JavaScript, and pre-processor languages like Sass, LESS, and JSX is called WebMaker. These pre-processors’ syntax will be automatically compiled by WebMaker so that the code is rendered correctly in the browser. To continue playing with code when offline, utilise the extension in Chrome or install it in the browser. Allows you to save your work locally, download the files, or share it on CodePen after you’ve finished experimenting with your code.

We haveCSSDesk as we go from the world of scripting to stylesheet language. Your configuration is the same as everyone else’s, with the finished webpage render on the right and your source code on the left. Using gradients and box shadows, this web tool is excellent for creating small webpage designs and testing the more complex CSS3 properties.


You may also download source code as files to your PC with this app. If you’re working on a laptop without any IDE software, it can be a good replacement. You might also create a brief URL link to post online. Then, additional programmers might enter and edit what you’ve previously produced—definitely an intriguing solution!

Another tool with a deep programming and software development foundation is IDE One. Some fairly well-known languages have syntax highlighting included in their online editor. There are numerous others, such as Objective-C, Java, C#, VB.NET, and SQL.


This tool is fantastic since it allows you to quickly debug a variety of programming languages from a single page. This source code can also be kept and shared online via a special URL. But, I do think that their website’s design is clogged up with advertisements and other content, which makes using it challenging. The opportunity to use alternative code libraries, such as Cocoa Touch for iPhone app development, would be incredibly amazing.

JSLint must be the self-described JavaScript Code Quality Tool. Although their website is a little odd, the code editor functions as you would expect it to.

SQL Fiddle

If you haven’t utilised their framework before, you could find the alternatives to be extremely perplexing. If you have the necessary expertise, you can work with open source software like Node.js. Nevertheless, a large portion of the source code doesn’t even support syntax highlighting, which is disappointing given the abundance of available alternatives. If you have the time, I recommend looking at JSLint, however it might not end up being your primary online JavaScript debugger.

The strength of a web application like jsFiddle was demonstrated earlier. We can now view SQL Fiddle, which functions in a similar manner but does not support SQL database syntax. This is by far my favourite option because I haven’t found a better one for testing database stuff.

Your SQL code’s complete output will be displayed in a table below the editors. On the right, you can implement new data, and on the left, you can create a schema by writing some code. You can save the SQL code for this database schema and use it to export your current database for installation on a new server.

ESLint Demo

This programme won’t be much help if you aren’t familiar with databases or SQL language. Nonetheless, this is fantastic even for new devs who are interested in learning SQL! See one of their simple code samples to get a sense of how the app functions.

You can specify writing guidelines for your code with ESLint. While working on a collaborative project, it’s an excellent tool to use to make sure that everyone adheres to the same coding standards and conventions. It offers such a vast array of possibilities for dictating your coding styles that it might be frightening, especially if you’re just getting started with ESLint.


Before even installing the NPM packages, you may test each rule against your code using this online ESLint sample site. It offers the complete list of rules that can be turned on and off. Once everything is ready, you may download the configuration file and add it to your project.

PHPStan is a tool for static analysis of PHP code. Without running the code, it looks for potential problems and coding errors. It will let you know if you access a property that doesn’t exist on a class or send a string value to a function that only accepts integers, for example.


To see how it functions, use the online editor on the PHPStan website. You’ll be shocked to learn that there are a surprising number of existing PHP codes that can be improved upon and fixed for potential problems. Static analysis can help you develop into a better developer because it will train you to produce syntactically correct code.

a multi-language compiler that is all-inclusive. It supports more than 40 languages, including C and C++ as well as Go, PHP, Java, and JavaScript. These tools allow you to write code in various languages, and the code will be immediately compiled and executed. This tool is ideal for fast testing your code for a demo or just for carrying out a test.


This application, in addition to the code runner, offers code challenges to help you hone your programming and problem-solving abilities. Starting points for the challenge range from the easier levels to the more difficult ones.

a web-based code editor that supports HTML, CSS, and JavaScript. You also incorporate a number of well-known libraries, like jQuery, React.js, Vue.js, Font Awesome, and many others. It’s a fantastic tool for prototyping ideas without the need to set up a computer environment. It can also be utilised for rapid demos.


It differs from other tools of a similar nature in part because it offers a native app for iOS and Android. This enables you to conveniently pour your thoughts on using your phone and tablet.

a programme that lets you create static websites using various cutting-edge tools and frameworks. It uses Eleventy.js, Node.js, and React.js. Nevertheless, you can also create plain-text HTML, CSS, and JavaScript.

Glitch offers a number of sophisticated tools in addition to the online editor where you input your codes, making it a superb working environment for developing static websites. It contains a browser debugger, an online Terminal where you can write commands, and logs.


You can download the files or share the project’s specific URL once the website is complete.

With the online development environment known as Stackblitz, you can create websites using cutting-edge stacks. It supports the front-end libraries React.js, Vue.js, and Angular as well as the back-end frameworks Next.js and Node.js.

You can either drag and drop a folder onto one of these frameworks to use it as the starting point for your project. It comes pre-configured with features like auto-refresh, installing dependencies, and Prettier that you generally have to set up on your own while working locally on your computer.


In addition to those, if you need to connect to a real-time database, you can also link your website to Firebase.

(Codepad is no longer available.)

Codepad is a distinctive web application that Steven Hazel invented that allows you to exchange code syntax online. Codepad gives you the option to copy/paste significant pieces of code for online sharing in addition to debugging.

Final Thoughts

Any error messages connected to your code are displayed on the output screen. You can switch the parsing language between C/C++, Perl, PHP, Python, Ruby, and a tonne of other languages using the radio buttons on the left-hand menu. Codepad, in my opinion, is best suited for software engineers that need to communicate and troubleshoot their more complex applications.

It is becoming simpler for developers to collaborate in the browser as more computers are becoming online. Who knows how far this trend will go as more and more technologies move away from local applications?

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