From c34f1e93dd21dc02842d02e91633f4a57b3f8d66 Mon Sep 17 00:00:00 2001
From: Joey Beauvais-Feisthauer <joeybf@wayne.edu>
Date: Sun, 26 Nov 2023 18:03:05 -0500
Subject: [PATCH] Add alert if JSON is invalid

---
 web_ext/sseq_gui/interface/index.js | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/web_ext/sseq_gui/interface/index.js b/web_ext/sseq_gui/interface/index.js
index 4b1cfb96c..7e7d81d03 100644
--- a/web_ext/sseq_gui/interface/index.js
+++ b/web_ext/sseq_gui/interface/index.js
@@ -278,11 +278,19 @@ messageHandler.Error = m => {
 document.getElementById('json-upload').addEventListener('change', () => {
     const file = document.getElementById('json-upload').files[0];
     const fileReader = new FileReader();
+
     fileReader.onload = e => {
-        // Remove whitespace to shorten URL
-        const json = JSON.stringify(JSON.parse(e.target.result));
-        window.location = `?module_json=${encodeURIComponent(json)}`;
+        try {
+            // Attempt to parse JSON
+            const json = JSON.stringify(JSON.parse(e.target.result));
+            window.location = `?module_json=${encodeURIComponent(json)}`;
+        } catch (error) {
+            // If an error occurs, display an error message
+            alert('Invalid JSON file. Please upload a valid JSON file.');
+            console.error('Error parsing JSON:', error);
+        }
     };
+
     fileReader.readAsText(file, 'UTF-8');
 });