Facing error "Failed to load resource: the server responded with a status of 404 (Not Found)" in web browse console


It seems like the problem is the JS files not being in the public folder. Express limits available files to a specified folder, so that no one can access your server.js through the browser and potentially exploit vulnerabilities in your code. Put your p5.* files into the public folder and it should work.


So Dan explains that in the video. If you watch from about minute 8:00 and more toward minute 9:10, he moves the p5js files to the public folder. If you think about this, your server is delivering the pages. For many programs, they try to keep server files and delivering files in different folders. This makes sense: You dont want to mix those files… it adds clarity to your file layout.

Dan post his code in github: https://github.com/CodingTrain/website/tree/master/Node/sockets

Looking at those files, it seems somebody changed the code and remove access to local p5js support files and cross-linked them to the CDN website, as you can see here:


Anyways, the folder structure should be


And then your html should look like:

<script src="library/p5.min.js"></script>
<script src="sketch.js"></script>

Then by setting your express to check the public folder, you should be able to access those files. If it doesn’t work, try changing the port (both in express and when you summon the page using localhost). When testing for posts, it is better to test for post greater than 1000 and even better if you choose something greater than 10000, as I mentioned before.