var express $=$ require$(\text{'}$express$\text{'})$;

var app $=$ express$()$;

var cors $=$ require$(\text{'}$cors$\text{'})$;

var bodyParser $=$ require$("$body$-$parser"$)$;

app.use$($cors$())$;

app.use$($bodyParser$.$json$())$;

let todoList $=[]$;

let completedList $=[]$;

app.use$($express$.$static$(\_\_$dirname$))$;

app.get$(\text{'}/$tasks$\text{'},$ function $($req$,$ res$)\{$

console.log$(\text{'}$GET $/$tasks$\text{'})$;

res.status$(200).$json$(\{$

todo: todoList,

completed: completedList

$\})$;

$\})$;

app.post$(\text{'}/$addTask$\text{'},$ function $($req$,$ res$)\{$

const task $=$ req.body.task;

console.log$(\text{'}$POST $/$addTask$\text{'},$ task$)$;

if $(!$task $||$ todoList.includes$($task$)||$ completedList.includes$($task$))\{$

return res.status$(400).$send$(\text{'}$Bad Request: task already exists!$\text{'})$;

$\}$

todoList.push$($task$)$;

res.status$(201).$send$(\text{'}$Task added successfully'$)$;

$\})$;

app.post$(\text{'}/$completeTask$\text{'},$ function $($req$,$ res$)\{$

const task $=$ req.body.task;

console.log$(\text{'}$POST $/$completeTask$\text{'},$ task$)$;

const taskIndex $=$ todoList.indexOf$($task$)$;

if $($taskIndex $===-1)\{$

return res.status$(400).$send$(\text{'}$Bad Request: task not found in TODO list!$\text{'})$;

$\}$

todoList.splice$($taskIndex$,1)$;

completedList.push$($task$)$;

res.status$(200).$send$(\text{'}$Task completed successfully'$)$;

$\})$;

app.post$(\text{'}/$deleteTask$\text{'},$ function $($req$,$ res$)\{$

const task $=$ req.body.task;

const taskIndex $=$ completedList.indexOf$($task$)$;

console.log$(\text{'}$POST $/$deleteTask$\text{'},$ task$)$;

if $($taskIndex $===-1)\{$

return res.status$(400).$send$(\text{'}$Bad Request: task not found in Completed list!$\text{'})$;

$\}$

completedList.splice$($taskIndex$,1)$;

res.status$(200).$send$(\text{'}$Task deleted successfully'$)$;

$\})$;

app.post$(\text{'}/$clearAll$\text{'},$ function $($req$,$ res$)\{$

console.log$(\text{'}$POST $/$clearAll$\text{'})$;

todoList $=[]$;

completedList $=[]$;

res.status$(200).$send$(\text{'}$All tasks cleared'$)$;

$\})$;

const PORT $=3000$;

app.listen$($PORT$,$ function$()\{$

console.log$(`$Server is running on http:$//$localhost:$$\{$PORT$\}`)$;

$\})$;

I keep getting this code ; Uncaught ReferenceError: require is not defined

at app.js:$1$:$15$ I already did npm install express and it doesnt work ; I have read that wen browser do not accept require. How can i fix this error var express $=$ require$(\text{'}$express$\text{'})$;