Unable to set Nginx reverse proxy in my droplet ubuntu 20.4?

Hi Team,

Am unable to copy and paste the below properly qs it is replacing the other code on /etc/nginx/sites-available/default

location / {
        proxy_pass http://localhost:3000;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection 'upgrade';
        proxy_set_header Host $host;
        proxy_cache_bypass $http_upgrade;
    }

using the droplet- console using sudo vim and sudo nano .

Kindly check and let know how to paste in the above location?

Thanks and Regards Shivaprasad.G