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Errors / Blocked by the browser

Refused to execute script from '…' because its MIME type ('text/html') is not executable, and strict MIME type checking is enabled.

The browser asked for a script and got something else, so it would not run it.

That script never runs.

Why it happens

  • The script's URL answers an HTML page: a 404 page, a login page, or a single-page app's index.html for every path.
  • A server that sends .js files with the wrong Content-Type, or a proxy rewriting it.
  • X-Content-Type-Options: nosniff (a good header) makes the browser strict about it.

How to fix it

  1. Open the script URL directly: HTML there means a wrong path or a deleted file; fix the reference, and make missing assets answer 404.
  2. Serve JavaScript as text/javascript (.mjs included); check the host's MIME configuration.

Whose problem it is

Usually the site's own code or settings.

Does your site have it?

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Often seen with

  • Unexpected token '<'The browser asked for a script and got a web page instead, usually an error page or the home page.
  • 404 Not FoundThe server has nothing at this address: a page or file that was moved, deleted, or never existed.