Getting error while using express framework when responding inside setInterval() - node.js

Question

I am creating simple application to send a simple message hello when the user requests get request of home page.
app.get("/",(req,res)=>{
setInterval(function(){
res.status(200);
res.send("hello");
},5000)
})
The Idea is to send response after 5 seconds.
The compiler is throwing error after sending response .
The error is as follows
node:_http_outgoing:663
throw new ERR_HTTP_HEADERS_SENT('set');
^
Error [ERR_HTTP_HEADERS_SENT]: Cannot set headers after they are sent to the client
at new NodeError (node:internal/errors:400:5)
at ServerResponse.setHeader (node:_http_outgoing:663:11)
at ServerResponse.header (C:\Users\prudh\OneDrive\Documents\projects\whatsapp\node_modules\express\lib\response.js:794:10)
at ServerResponse.send (C:\Users\prudh\OneDrive\Documents\projects\whatsapp\node_modules\express\lib\response.js:174:12)
at Timeout._onTimeout (C:\Users\prudh\OneDrive\Documents\projects\whatsapp\index.js:40:13)
at listOnTimeout (node:internal/timers:564:17)
at process.processTimers (node:internal/timers:507:7) {
code: 'ERR_HTTP_HEADERS_SENT'
}
Why am I facing this error message.
This is the basic code block so I have not tried anything.

Answer 1

setInterval runs function repeatedly, so you see this error when it tries to run function second time, because response is already sent to client. Use setTimeout instead to delay function:
app.get("/",(req,res) =>
setTimeout(() => res.status(200).send("hello"), 5000)
)