Node js webhook sending HTML page in response

I am using my express js app as webhook. There is a .get() method only for sending HTML page (Home Page) to browser.

app.get('/', (req, res) => {
    //res.send('Hello World!');
    
    res.sendFile(path.join(__dirname, '/views/abc.html'));

});

Now I have another method for handling webhook request as follow.

app.post('/',(req,res)=> {


const text = req.body.text;

const jsonResponse = {

    "fulfillmentMessages": [
      {
        "text": {
          "text": [
            "Text response from webhook"
          ]
        }
      }
    ]
  }

res.status(200).send(jsonResponse);
});

Everything works perfectly, but the above get() method sends response to the webhook which eventually ends up as an error.

I don't want to send this HTML as it is only my website home page. How do I restrict this method from sending response to webhook.