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Glitch, a great Platform for Developers

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Glitch is a pretty amazing platform to learn and experiment with code. This post introduces you to Glitch and makes you go from zero to hero

Glitch is a great platform to learn how to code.

I use Glitch on many of my tutorials, I think it’s a great tool to showcase concepts, and also allow people to use your projects and build upon them.

Here is an example project I made on Glitch with React and React Router:!/flaviocopes-react-router-v4-2

With Glitch you can easily create demos and prototypes of applications written in JavaScript, from simple web pages to advanced frameworks such as React or Vue, and server-side Node.js apps.

It is built on top of Node, and you have the ability to install any npm package you want, run webpack and much more.

It’s brought to you by the people that made some hugely successful products, including Trello and Stack Overflow, so it has a lot of credibility bonuses for that.

Why do I think Glitch is great?

Glitch “clicked” for me in how it presents itself in a funny interface, but not dumbed down.

You have access to logs, the console, and lots of internal stuff.

Also, the concept of remixing so prominent in the interface makes me much more likely to create lots of projects there, as I never have to start from a clean slate.

You can start diving into the code without losing time setting up an environment, version control, and focus on the idea, with an automatic HTTPS URL and a CDN for the media assets.

Also, there’s no lock-in at all, it’s just Node.js (or if you don’t use server-side JavaScript, it’s just HTML, JS and CSS)

Is it free?

Yes, it’s free, and in the future they might add even more features on top for a paid plan, but they state that the current Glitch will always be free as it is now.

There are reasonable limits like

An overview of Glitch

This is the Glitch homepage, it shows a few projects that they decided to showcase because they are cool, and some starter projects:

The homepage as guest

Creating an account is free and easy, just press “Sign in” and choose between Facebook and GitHub as your “entry points” (I recommend GitHub):

Sign in to Glitch

You are redirected to GitHub to authorize:

Authorize Glitch on GitHub

Once logged in, the home page changes to also show your projects:

The home page once logged in

Clicking Your Projects sends you to your profile page, which has your name in the URL. Mine is

The Glitch profile

You can pin projects, to find them more easily when you’ll have lots of them.

The concept of remixing

When you first start, of course you will have no projects of your own.

Glitch makes it super easy to start, and you never start from a blank project. You always remix another project.

You can remix a project you like, maybe one you found on Twitter or featured in the Glitch homepage, or you can start from a project that’s a boilerplate to start something:

There are many other starter glitches in these collections:

If you’re learning to code right now, the Learn to Code glitch Collection is very nice.

I have created a few starter apps that I constantly use for my demos and tests, and they are:

Glitch makes it very easy to create your own building blocks, and by pinning them in your profile, you can have them always on the top, easy to find.

Remix a glitch

Once you have a glitch you want to build upon, you just click it, and a window shows up:

Remix glitch modal

There are 3 buttons:

Every time you remix a glitch, a new project is created, with a random name.

Here is a glitch right after creating it by remixing another one:

A remixed glitch

Glitch gave it the name guttural-noodle. Clicking the name you can change it:

Rename a glitch

You can also change the description.

From here you can also create a new glitch from zero, remix the current glitch, or go to another one.

GitHub import/export

There is an easy import/export from/to GitHub, which is very convenient:

GitHub Import export

Keep your project private

Clicking the lock makes the glitch private:

Keep project private

Create a new project

Clicking “New Project” shows 3 options:

Create a new project on Glitch

This is a shortcut to going out to find those starter apps, and remix them. Under the hoods, clicking one of those options remixes an existing glitch.

On any glitch, clicking “Show” will open a new tab where the app is run:

The app running


Notice the URL, it’s:

That reflects the app name.

The editing URL is a bit different:!/flavio-my-nice-project

The preview runs on a subdomain of, while editing is done on

Noticed the fishes on the right of the page? It’s a little JavaScript that Glitch recommend to add to the page, to let other people remix the project or see the source:

The fish on preview

Running the app

Any time you make a change to the source, the app is rebuilt, and the live view is refreshed.

This is so convenient, real time applying changes gives an immediate feedback that’s a great help when developing.


You don’t want any API key or password that might be used in the code to be seen by everyone. Any of those secret strings must be put in the special .env file, which has a key next to it.

If you invite collaborators, they will be able to see the content, as they are part of the project.

But anyone remixing it, or people invited by you to help, will not see the file content.

Managing files

Adding a new file to a project is easy.

You can drag and drop files and folders from your local computer, or click the “New File” button above the files list.

It’s also intuitive how to rename, copy or delete files:

Manage the glitch

One-click license and code of conduct

Having a license in the code is one of the things that’s overlooked in sample projects, but determines what others can do, or can’t do, with your project. Without a license, a project is not open source, and all rights are reserved, so the code cannot be redistributed, and other people cannot do anything with it (note: this is my understanding and IANAL - I Am Not A Lawyer).

Glitch makes it super easy to add a license, in the New File panel:

Add a license

View the license

You can easily change it as well:

Change the license

The code of conduct is another very important piece for any project and community. It makes contributors feel welcomed and protected in their participation to the community.

The Add Code of Conduct button adds a sample code of conduct for open source projects you can start from.

Adding an npm package

Click the package.json file, and if you don’t have one yet, create an empty one.

Click the Add Package button that now appears on top, and you can add new package.

Add an npm package

Also, if you have a package that needs to be updated, Glitch will show the number of packages that need an update, and you can update them to the latest release with a simple click:

Update dependencies

Use a custom version of Node.js

You can set the Node.js version to any of these in your package.json. Using .x will use the latest release of a major version, which is the most useful thing, like this:

  "engines": {
    "node": "8.x"


Glitch has a persistent file system. Files are kept on disk even if your app is stopped, or you don’t use if for a long time.

This allows you to store data on disk, using local databases or file-based storage (flat-file).

If you put your data in the .data folder, this special name indicates the content will not be copied to a new project with the glitch is remixed.

Embedding a glitch in a page

Key to using Glitch to create tutorials is the ability to embed the code and the presentation view, in a page.

Click Share and Embed Project to open the Embed Project view. From there you can choose to only embed the code, the app, or customize the height of the widget - and get its HTML code to put on your site:

Embed glitch

Collaborating on a glitch

From the Share panel, the Invite Collaborators to edit link lets you invite anyone to edit the glitch in real time with you.

You can see their changes as they make it. It’s pretty cool!

Asking for help

Linked to this collaboration feature, there’s a great one: you can ask help from anyone in the world, just by selecting some text in the page, and click the raised hand icon:

Ask for help on a line

This opens a panel where you can add a language tag, and a brief description of what you need:

Describe your problem

Once done, your request will be shown in the Glitch homepage for anyone to pick up.

When a person jumps in to help, they see the line you highlighted, and I found that comments made a good way to communicate like a chat:

Help out someone

See the logs

Click Logs to have access to all the logs of the app:

The project logs

Access the console

From the Logs panel, there is a Console button. Click it to open the interactive console in a separate tab in the browser:

The project console

The debugger

Clicking the Debugger button in the Logs panel, an instance of the Chrome DevTools opens in another tab with a link to the debugger URL.

The debugger

The changes history

A great feature is the ability to check all your changes in the project history.

It’s a lot like how Git works - in fact, under the hoods it’s Git powering this really easy to use interface, which opens clicking the ⏪ button:

The history of changes

How is Glitch different than Codepen or JSFiddle?

One big difference that separates Glitch from other tools is the ability to run server-side code.

Codepen and JSFiddle can only run frontend code, while a Glitch can even be used as a lightweight server for your apps - keeping the usage limits in mind.

For example I have set up an Express.js server that is triggered by a Webhook at specific times during the day to perform some duties. I don’t need to worry about it running on another server, I just wrote it on Glitch and run directly from there.

That’s it!

I hope you like my small tutorial on using Glitch, and I hope I explained most of the killer features of it.

More questions?

I suggest to just try it, and see if it clicks for you too.

The Glitch FAQ is a great place to start.

Have fun!

Here is how can I help you: