'Showing video player on Node JS simple route

I have very simple node js application using express. I have written route as below.

app.get("/", (req, res, next) => {
  res.status(200).json("Application is up and running on port 4003!");
});

It was running quite well, was showing "Application is up and running on port 4003!" as expected but now, it suddenly showing up window as below and same for all other routes too.

I have not added video tag anywhere in my application.

What I did wrong?

enter image description here

Similarly I tried to run in postman and showing as below enter image description here

Here is response header

enter image description here

node.jsexpress


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