Failed to load module script

Shopify Apps

Topic summary

A developer is experiencing a MIME type error when deploying a PHP-based Shopify app to a cloud server. The frontend fails to render with the error: “Failed to load module script: Expected a JavaScript module script but the server responded with a MIME type of ‘application/octet-stream’.”

Key Details:

  • The app works correctly in local development
  • Error occurs only after cloud deployment
  • The issue relates to strict MIME type checking for JavaScript module scripts per HTML spec

Seeking Help:

  • Looking for server configuration guidance to properly serve JavaScript files
  • Asking if others have encountered similar deployment issues

The discussion remains open with no responses yet. Screenshots of the error console are included to illustrate the problem.

Summarized with AI on October 31. AI used: claude-sonnet-4-5-20250929.
1

Hello everyone,

I have hosted my Shopify app on a cloud server. It is a PHP template app, but the frontend is not rendering. Instead, I am getting the following error in the console:

Failed to load module script: Expected a JavaScript module script but the server responded with a MIME type of “application/octet-stream”. Strict MIME type checking is enforced for module scripts per HTML spec.

When I run the app locally, it works perfectly. However, after deploying it to the cloud server, the frontend does not load.
Has anyone faced a similar issue? Do I need to configure my server differently to serve JavaScript files correctly?

Any help or guidance would be greatly appreciated!

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