From 6ce2d3e55bbb4d0b34dd0c6274104a31c9b8e511 Mon Sep 17 00:00:00 2001
From: eeshsaxena <eeshsaxena@gmail.com>
Date: Sat, 22 Aug 2026 12:52:26 +0530
Subject: [PATCH] Fix attendance_app: await async readData() in /students and
 /download

readData() returns a MongoDB find().toArray() promise, but /students did
res.json(readData()) and /download did readData().map(...) with no await.
So /students serialized a pending promise as {} and /download crashed on
.map (a promise has no .map). Awaiting the promise returns the actual
student list from both routes.
---
 attendance_app/server.js | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/attendance_app/server.js b/attendance_app/server.js
index 4cc1a3c17..6036d1325 100644
--- a/attendance_app/server.js
+++ b/attendance_app/server.js
@@ -27,8 +27,8 @@ function writeData(data) {
 
 }
 
-app.get("/students", (req, res) => {
-  res.json(readData());
+app.get("/students", async (req, res) => {
+  res.json(await readData());
 });
 
 app.post("/students", async (req, res) => {
@@ -63,8 +63,8 @@ app.delete("/students/:id", (req, res) => {
   res.status(204).send();
 });
 
-app.get("/download", (req, res) => {
-  const students = readData();
+app.get("/download", async (req, res) => {
+  const students = await readData();
   const csvData = "Roll Number,Name,Attendance\n" + students.map(s => `${s.rollNumber},${s.name},${s.attendance}`).join("\n");
 
   const filePath = path.join(__dirname, `attendance_${Date.now()}.csv`);