The Vue application is encountering an unexpected error in Chrome that is puzzling me as I search for a solution

Currently, I am delving deep into learning Vue.js and have decided to revisit the documentation from scratch and work through it in reverse order.

Below is the content of my index.html file:

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Learning Vue</title>
    <script type="importmap">
      {
        "imports": {
          "vue": "https://unpkg.com/vue@3/dist/vue.esm-browser.js"
        }
      }
    </script>
  </head>
  <body>
    <div id="app"></div>
    <script type="module" src="./index.js"></script>
  </body>
</html>

Now let's take a look at my index.js file:

import { createApp } from "vue";

import App from "./App.vue";

const app = createApp(App);

app.mount("#app");

Finally, here is my App.vue file:

<template>
  <button @click="increment">
    {{ count }}
  </button>
</template>
<script setup>
import { ref } from "vue";

const count = ref(0);

function increment() {
  count.value++;
}
</script>

Upon testing in Chrome (Version 102.0.5005.61 (Official Build) (64-bit)), I encountered an error message stating: 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.

I've researched that if there's uncertainty about the script type, the browser might respond with "application/octet-stream". But, why doesn't the browser recognize the script type when it's specified as a module?

I've extensively searched for a solution to this issue but haven't found one yet. Even after reviewing numerous examples, I can't seem to pinpoint any errors in my code.

If anyone knows why I'm encountering this error and how to resolve it, your insights would be greatly appreciated.

Answer №1

The file on your web server is being served to the browser with an incorrect Content-Type HTTP header - it should be set to text/javascript, but instead, the server is either sending application/octet-stream or not setting this HTTP header at all.

In this case, it is solely the fault of your web server - neither the browser nor Vue are responsible for this issue. A similar error may occur in Firefox as well.

Answer №2

Upon further reflection, I have come to realize that the solution was quite simple, but my lack of experience prevented me from seeing it initially.

If you are not utilizing the Vue CLI, you will encounter an issue if you try to name a file with the .vue extension because the browser does not recognize it as a vue file. In such cases, you must use the .js extension instead. For instance, the following code snippet would not function as intended:

    <script type="module">
      import { createApp } from "vue";
      import app from "./app.vue";

      createApp(app).mount("#app");
    </script>

Conversely, the revised code below would work without any issues:

    <script type="module">
      import { createApp } from "vue";
      import app from "./app.js";

      createApp(app).mount("#app");
    </script>

Every day presents learning opportunities, and I appreciate this newfound knowledge.

I do believe that the documentation on vuejs.org could benefit from improvements, particularly in providing more comprehensive examples rather than just snippets. Beginners would greatly benefit from this additional guidance.

Answer №3

Importmaps are ideal for development purposes but unfortunately lack proper support.

If you want to avoid dealing with these issues, consider utilizing platforms such as nexuscode.online as your development environment.

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