I would like to add <body><noscript><h1>Please enable your javascript<h1></noscript></body> in the developer mode.
I tried to configure it in the nuxt.config.js file but it didn't worked.
If you want to setup a noscript tag, you need to create an app.html in the root directory of your project as explained in the documentation.
Like this
<!DOCTYPE html>
<html {{ HTML_ATTRS }}>
<head {{ HEAD_ATTRS }}>
{{ HEAD }}
</head>
<body {{ BODY_ATTRS }}>
<noscript>Your browser does not support JavaScript!</noscript>
{{ APP }}
</body>
</html>
Keep in mind that if you're using ssr: true, you will still get some content even if the JS is disabled because the content will be generated on the server for some parts.