Node.js - denying the request to apply CSS (MIME type text/html)

While working on implementing my CSS in HTML using NodeJS, Express, and socket.io, I encountered an error message stating:

'Refused to apply style from 'http://localhost:8000/index.css' because its MIME type ('text/html') is not a supported stylesheet MIME type, and strict MIME checking is enabled.'

Note: The error only occurs when running on localhost:8000 (Node.js) but not in the normal index.html file.

Here is the configuration in index.js:

var app = express()
   .use(SocketIOFileUpload.router)
   .get('/', function (req, res) {
      res.sendFile(__dirname + '/index.html');
   })

Here is my file structure:

  • style
    • style.css
  • images
  • lib
  • node_modules

    index.html
    appConfig.js
    index.js

Steps I've taken so far:

  • Changed my CSS script from

<link rel="stylesheet" type="text/css" href="style/style.css"/>
into type="text/html": it removed the error but the CSS still hasn't been applied in the HTML.

  • Checked the spelling of my CSS file name: no issues with the name or the file path

I've searched all over the internet for solutions, but nothing seems to help. It's possible that I misconfigured something since I'm not very familiar with the setup, but I'm out of ideas. Any help or hints would be greatly appreciated. Thank you!

Answer №1

Could you provide a breakdown of your directory structure? It seems like the issue stems from attempting to apply CSS styles to your HTML file, but the CSS file being returned by Node has a MIME type of HTML. Manually setting the MIME type of an HTML file to CSS won't yield the desired results. Can you confirm the name and path of your CSS file? My hunch is that your app isn't configured to serve the CSS file properly. When requesting the CSS file, the server may be responding with a 404 error, which presents as an HTML MIME type error. Check your console logs for any 404 errors related to the CSS file when loading the page. To assist further, please share how and where you are serving static files. It appears that your `style.css` is located within the `style` folder, so you need to adjust the static directory settings accordingly. Here's a helpful reference:

app.use(express.static('public'))

Source: https://expressjs.com/en/starter/static-files.html For your situation, consider grouping your images and styles folders under `public` and implementing the example provided above. In a production environment, it would be advisable to serve static files using a reverse proxy such as Nginx.

Answer №2

While troubleshooting, I discovered the solution: app.use(express.static(__dirname + '/'));

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