Test if string is an IP address in Node.js
- 12 Nov 2017: Post was created (diff)
I just found some new (since v0.3.0) functions in the Node.js net module. These functions enables you to check if you have a valid IP address regardless of family, or if it is specifically an IPv4 or IPv6 address.
const net = require('net')
const assert = require('assert')
assert.strictEqual(net.isIP('127.0.0.1'), 4);
assert.strictEqual(net.isIP('x127.0.0.1'), 0);
assert.strictEqual(net.isIP('example.com'), 0);
assert.strictEqual(net.isIP('0000:0000:0000:0000:0000:0000:0000:0000'), 6);
assert.strictEqual(net.isIPv4('127.0.0.1'), true);
assert.strictEqual(net.isIPv4('example.com'), false);
assert.strictEqual(net.isIPv6('127.0.0.1'), false);
assert.strictEqual(net.isIPv6('2001:252:0:1::2008:6'), true);
The above tests are taken from the upstream repository.
References
- https://nodejs.org/dist/latest/docs/api/net.html#net_net_isip_input
- https://github.com/nodejs/node/blob/98e54b0/test/parallel/test-net-isip.js
If you have any comments or feedback, please send me an e-mail. (stig at stigok dotcom).
Did you find any typos, incorrect information, or have something to add? Then please propose a change to this post.