How to comment code in a vue.js file?

As Bill Criswell said we can use HTML comment syntax.

<!-- Comment -->

But, It will work outside the template tag too, comment.vue

<!-- Testing comments, this will work too. -->

<template>
    <!-- This will work too -->

    <div>
        <!-- Html Comments -->
        Hello There!
    </div>
</template>

<style><style>

<!-- Commenting here -->

<script>
    // Commenting only 1 line

    /**
      * Commenting multiple lines
      * Commenting multiple lines
      */
</script>

You'd want to use standard HTML comments in the <template> tag in your situation. They'll be stripped from the output as well which is nice.

<!-- Comment -->