default

server {
        server_name api.example.com.br; //seu endereco do dominio.
        location / {
                proxy_set_header Host $host;
                proxy_set_header X-Real-IP $remote_addr;
                proxy_pass http://127.0.0.1:3005;
        }
}
server {
        server_name example.com.br; //seu endereco do dominio.
        location /api {
                proxy_set_header Host $host;
                proxy_set_header X-Real-IP $remote_addr;
                proxy_pass http://127.0.0.1:3005;
        }
}