router__post-route.js

// Route that generates the lorem ipsum text and reloads a modified index.html
router.post('/', (request, response) => {
  request.on("data", function(inputValue) {
    // Convert the POST data into a readable string
    let query = inputValue.toString(); // i.e. numberOfParagraphs=3
    // Parse the query into a key/value pair and store the value of numberOfParagraphs
    // in a variable
    let numberOfParagraphs = querystring.parse(query).numberOfParagraphs;
    // Generate the lorem ipsum text with the getAllParagraphs function
    let loremIpsumText = loremIpsum.getAllParagraphs(numberOfParagraphs);
    // Capture the contents of index.html in a variable
    let fileContents = fs.readFileSync("./public/index.html", {encoding: "utf8"});
    // Replace the placeholder <div> with the lorem ipsum text
    fileContents = fileContents.replace("<div class='placeholder-div'></div>",loremIpsumText);;
    response.setHeader('Content-Type', 'text/html');
    // Send a response to the client with the modified index.html file
    response.write(fileContents);
    response.end();
  });
});