Utilize an npm package to transform a CSS file into inline styles within an HTML document

I have an HTML file with an external CSS file and I would like to inline the styles from the external style sheet into one inline <style> tag at the top of the head. Any assistance would be greatly appreciated.

Note: I do not want to use the style attribute applied to each element, I want to have one style tag at the top.

Original Code

p {
  color: red;
}
<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="utf-8>
  <title>HTML Template</title>
  <link rel="stylesheet" type="text/css" href="css/mystyle.css">
  <script type="text/javascript" src="js/myscript.js"></script>
</head>

<body>
  <p>Welcome to Template!!</p>
</body>

</html>

After Converting

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="utf-8>
  <title>HTML Template</title>
  <!-- START: Replaced inline tag from external css file mystyle.css as above-->
  <style>
    .p {
      color: red
    }
  </style>
  <!-- END: Replaced inline tag from external css file mystyle.css as above-->
  <script type="text/javascript" src="js/myscript.js"></script>
</head>

<body>
  <p>Welcome to Template!!</p>
</body>

</html>

Answer №1

To begin, ensure your html file is accessible from a web browser. For PHP users, you can make it accessible by running the command php -S 127.0.0.1:4000. Make sure to open localhost:4000 in your web browser to access it. There are other ways to make it accessible in different programming languages, but that goes beyond the scope of this question.

The next step is to install the npm package called inliner using npm install -g inliner.

Then, run

inliner http://localhost:4000 > output.html
.

Open the output.html file to view the result.

If you prefer not to convert the image to base64 encoding, run

inliner -i http://localhost:4000 > output.html
.

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