Simple NGINX config to return real client IP address

NGINX Config - IP Address JSON

map ":$http_x_forwarded_for" $IP_ADDR {
    ":" $remote_addr; # Forwarded for not set
    default $http_x_forwarded_for; # Forwarded for is set
}

server {
    server_name example.com;
    listen 80;
    listen [::]:80;

    location / {
        default_type application/json;
        return 200 "{\"ip\": \"$IP_ADDR\"}";
    }
}