oa-nodejs-internship-lesson1-get-ip-info

Node.js utility to get IPv4 or IPv6 addresses of a current machine.

Basic Usage

const {
    getIpAddress,
    getExternalIpAddress,
    getExternalIpAddressPromise,
} = require('oa-nodejs-internship-lesson1-get-ip-info');

const ipv4Address = getIpAddress(); // e.g. '192.0.2.146'

Or you can use callback-based getExternalIpAddress function to get the IP that is seen when you make any HTTP request. This might be useful when first variant gives you LAN IP instead of WAN IP.

The getExternalIpAddressPromise is equivalent to the getExternalIpAddress but is it's promisified version, so first param (callback) is omitted.

// if you like callbacks
getExternalIpAddress((ipv4Address) => {
    console.log(ipv4Address); // e.g. '103.114.98.206'
});

// if you like Promises
getExternalIpAddressPromise()
    .then((ipv4Address) => {
        console.log(ipv4Address); // e.g. '103.114.98.206'
    });

If for some reason it's impossible to specify the IP address, '0.0.0.0' is returned as result from any of functions.

Advanced Usage

The getIpAddress accepts one optional family string param, which can be either 'IPv4' (default) or 'IPv6'.

Note: But if you're using Node.js version 18.x or higher, this param should be numeric 4 or 6 accordingly, and should be passed always. Check Node.js v18.x OS docs.

const ipv6Address = getIpAddress('IPv6');
//=> e.g. '2001:0db8:85a3:0000:0000:8a2e:0370:7334'

// but for Node.js v18.x or higher
const ipv6Address = getIpAddress(6);

The getExternalIpAddress accepts one optional apiHttpOptions array params, defaults to empty array [], which is an additional list of Node.js HTTP Request Options that should be used before predefined list of Public IP Address API services: api.ipify.org, ipinfo.io/ip, icanhazip.com, ident.me -- in given order.

When request to one API fails, attempt to get IP from the next is made, and down to the last/success or to default '0.0.0.0' fallback value.

Only text/plain or text/html response content-types are supported. No caching supported, and no multiple concurrent use advised.

getExternalIpAddress((ipv4Address) => {
    console.log(ipv4Address); // 'https://ipapi.co/ip' was used as first attempt to get IP
}, [{ host: 'ipapi.co', path: '/ip', port: 443 }]);

// or if you like Promises
getExternalIpAddressPromise([{ host: 'ident.me' }])
    .then((ipv4Address) => {
        console.log(ipv4Address); // 'http://ident.me' was used as first attempt to get IP
    });

For more examples see usage examples.

Note: By default 'http:' protocol is used (80 port). If your service uses 'https:' protocol you need to specify that in the apiHttpOptions array's item by passing port: 443 (as in example above) or protocol: 'https:'. If crypto module is disabled in the current Node.js build, no error will be shown.

Note: The family/version of returned IP (IPv4 or IPv6) fully depends on the passed API service options. By default it's an IPv4.

License

ISC