Fool-proofing the website

src/handlers/homeViewHandler.js

@@ -1,10 +1,16 @@
 const { parsePdfFile } = require('./pdfHandler');
 
-const post = async (req, res) => {
-  const { pdf } = req.files;
-  const data = await parsePdfFile(pdf);
-
-  res.status(200).render('index', { values: data, filename: pdf.name });
+const post = (req, res) => {
+  if (!req.files) {
+    res.status(400);
+  } else {
+    const { pdf } = req.files;
+    parsePdfFile(pdf).then((data) => {
+      res.status(200).render('index', { values: data, filename: pdf.name });
+    }).catch(() => {
+      res.status(500).render('index', { error: 'Something went wrong. Are you sure this is a valid PDF?' });
+    });
+  }
 };
 
 const get = async (req, res) => {

src/views/index.handlebars

@@ -1,13 +1,18 @@
 <div class="container">
+    {{#if error }}
+    <div class="alert alert-danger show" role="alert">
+        {{error}}
+    </div>
+    {{/if}}
+
     <form action="/" method="POST" enctype="multipart/form-data">
         <div class="mb-3">
             <label for="formFile" class="form-label">Resmed PDF file:</label>
-            <input class="form-control" type="file" id="pdf" name="pdf">
+            <input required class="form-control" type="file" id="pdf" name="pdf">
         </div>
 
         <button type="submit" class="btn btn-primary">Submit</button>
     </form>
-
     {{#if values.length }}
         <hr>