Nginx Redirect www to non-www and non-www to www

Code for Nginx redirect www to non-www with a non-hard coded domain name.

server {
    ...
    # Redirect www to non-www
    if ( $host ~ ^www\.(?<domain>.+) ) {
       rewrite ^/(.*)$ $scheme://$domain/$1;
    }
}

Using hardcoded server_name.

server {
    server_name www.example.com;
    return  301 $scheme://example.com$request_uri;
}

server {
    server_name example.com;
    # more configuration options here
}

Example code snippet for non-www to www.

server { 
    if ($host !~ ^www\.) {
        rewrite ^ https://www.$host$request_uri permanent;
    } 
}

Another way: Hardcoded Nginx non-www to www for a single domain.

server { 
   ...
   server_name  example.com; 
   return 301 https://www.example.com$request_uri;
}

For All Domains:

server {
   server_name "~^(?!www\.).*" ;
   return 301 $scheme://www.$host$request_uri;
}

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