React training project ends up with an error "Build Result Error: There was a problem with a file build result.

PAL AKHILESH SINGH 20 Reputation points

The app cannot be viewed in the browser. Here is the terminal output:

[18:37:56] [snowpack] Error: HTML fragment found!

HTML fragments (files not starting with "<!doctype html>") are not transformed like full HTML pages.

Add the missing doctype, or set buildOptions.htmlFragments=true if HTML fragments are expected.

[18:37:56] [snowpack] [500] /

This question is related to the following Learning Module

Azure Training
Azure Training
Azure: A cloud computing platform and infrastructure for building, deploying and managing applications and services through a worldwide network of Microsoft-managed datacenters.Training: Instruction to develop new skills.
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Accepted answer
  1. SiddeshTN 3,520 Reputation points Microsoft Vendor


    Thank you for reaching out to us on Microsoft Q&A forum. 

    The error message you are encountering suggests that Snowpack is interpreting your HTML file as a fragment due to the absence of the <!DOCTYPE html> declaration at the beginning. To resolve this issue, ensure that your index.html file includes the <!DOCTYPE html> declaration at the very start.

    To fix this issue, make sure your index.html file starts with the <!DOCTYPE html> declaration, like this:

    <!DOCTYPE html>
    <html lang="en">
        <div id="app"></div>
        <script type="module" src="/dist/index.js"></script>

    Steps to Resolve the Issue

    1.Open the index.html file in your public folder and ensure the first line
    is <!DOCTYPE html>.
    2.Make sure that index.html is in the public folder and index.jsx is in the src folder.
    3.Make sure your package.json file includes the correct scripts for starting Snowpack, which should look something like this:

    "scripts": {
        "start": "snowpack dev",
        "build": "snowpack build"

    4.To start the development server, open the integrated terminal in Visual Studio Code by selecting View > Terminal or pressing Ctrl + \ (on Mac, `Cmd + \`), and run the command npm start.
    5.Manually open your browser and navigate to http://localhost:8080 if it does not open automatically.

    If you continue to face issues, please let us know in the comments. We are here to help.

    If you find this information helpful, please acknowledge by clicking the "Upvote" buttons on the post.

    1 person found this answer helpful.

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