tldts is a JavaScript library to extract hostnames, domains, public suffixes, top-level domains and subdomains from URLs.
Features:
- Tuned for performance (order of 0.1 to 1 μs per input)
- Handles both URLs and hostnames
- Full Unicode/IDNA support
- Support parsing email addresses
- Detect IPv4 and IPv6 addresses
- Continuously updated version of the public suffix list
- TypeScript, ships with
umd,esm,cjsbundles and type definitions - Small bundles and small memory footprint
- Battle tested: full test coverage and production use
tldts from another library like psl, make sure to check the migration section.
npm install --save tldtsUsing the command-line interface:
$ npx tldts 'http://www.writethedocs.org/conf/eu/2017/'
{
"domain": "writethedocs.org",
"domainWithoutSuffix": "writethedocs",
"hostname": "www.writethedocs.org",
"isIcann": true,
"isIp": false,
"isPrivate": false,
"publicSuffix": "org",
"subdomain": "www"
}Or from the command-line in batch:
$ echo "http://www.writethedocs.org/\nhttps://example.com" | npx tldts
{
"domain": "writethedocs.org",
"domainWithoutSuffix": "writethedocs",
"hostname": "www.writethedocs.org",
"isIcann": true,
"isIp": false,
"isPrivate": false,
"publicSuffix": "org",
"subdomain": "www"
}
{
"domain": "example.com",
"domainWithoutSuffix": "example",
"hostname": "example.com",
"isIcann": true,
"isIp": false,
"isPrivate": false,
"publicSuffix": "com",
"subdomain": ""
}Programmatically:
const { parse } = require('tldts');
// Retrieving hostname related informations of a given URL
parse('http://www.writethedocs.org/conf/eu/2017/');
// { domain: 'writethedocs.org',
// domainWithoutSuffix: 'writethedocs',
// hostname: 'www.writethedocs.org',
// isIcann: true,
// isIp: false,
// isPrivate: false,
// publicSuffix: 'org',
// subdomain: 'www' }Modern ES6 modules import is also supported:
import { parse } from 'tldts';Alternatively, you can try it directly in your browser here: https://npm.runkit.com/tldts
Check README.md for more details about the API.
TL;DR—here is a quick overview of how to use tldts to match the default behavior of the psl library. Skip to after the tables for a more detailed explanation.
| Parsing a hostname | |
|---|---|
tldts |
tldts.parse('spark-public.s3.amazonaws.com', { allowPrivateDomains: true }) |
psl |
psl.parse('spark-public.s3.amazonaws.com') |
| Note | Make sure to include { allowPrivateDomains: true } to consider private suffixes |
| Parsing a URL | |
|---|---|
tldts |
tldts.parse('https://spark-public.s3.amazonaws.com/data', { allowPrivateDomains: true }) |
psl |
psl.parse(new URL('https://spark-public.s3.amazonaws.com/data').hostname) |
| Note | No need to extract hostnames from URLs, tldts can do that for you |
| Getting the domain | |
|---|---|
tldts |
tldts.getDomain('spark-public.s3.amazonaws.com', { allowPrivateDomains: true }) |
psl |
psl.get('spark-public.s3.amazonaws.com') |
| Note | Using specific functions like getDomain are more efficient then relying on parse |
| Getting the Public Suffix | |
|---|---|
tldts |
tldts.getPublicSuffix('spark-public.s3.amazonaws.com', { allowPrivateDomains: true }) |
psl |
psl.parse('spark-public.s3.amazonaws.com').tld |
Explanation. There are multiple libraries which can be used to parse URIs
based on the Public Suffix List. Not all these libraries offer the same
behavior by default and depending on your particular use-case, this can matter.
When migrating from another library to tldts, make sure to read this section
to preserve the same behavior.
The biggest difference between tldts's default behavior and some other
libraries like psl has to do with which suffixes are considered by default.
The default for tldts is to only consider the ICANN section and ignore the
Private section.
Consider this example using the unmaintained psl library:
const psl = require('psl');
psl.parse('https://spark-public.s3.amazonaws.com/dataanalysis/loansData.csv')
// {
// input: 'spark-public.s3.amazonaws.com',
// tld: 's3.amazonaws.com', <<< Public Suffix is from Private section
// sld: 'spark-public',
// domain: 'spark-public.s3.amazonaws.com',
// subdomain: null,
// listed: true
// }And now with tldts:
const { parse } = require('tldts');
parse('spark-public.s3.amazonaws.com');
// {
// domain: 'amazonaws.com',
// domainWithoutSuffix: 'amazonaws',
// hostname: 'spark-public.s3.amazonaws.com',
// isIcann: true,
// isIp: false,
// isPrivate: false,
// publicSuffix: 'com', <<< By default, use Public Suffix from ICANN section
// subdomain: 'spark-public.s3'
// }To get the same behavior, you need to pass the { allowPrivateDomains: true } option:
const { parse } = require('tldts');
parse('spark-public.s3.amazonaws.com', { allowPrivateDomains: true });
// {
// domain: 'spark-public.s3.amazonaws.com',
// domainWithoutSuffix: 'spark-public',
// hostname: 'spark-public.s3.amazonaws.com',
// isIcann: false,
// isIp: false,
// isPrivate: true,
// publicSuffix: 's3.amazonaws.com', <<< Private Public Suffix is used
// subdomain: ''
// }Here are some other differences which can make your life easy. tldts accepts
both hostnames and URLs as arguments, so you do not need to parse your
inputs before handing them over to tldts:
const { parse } = require('tldts');
// Both are fine!
parse('spark-public.s3.amazonaws.com', { allowPrivateDomains: true });
parse('https://spark-public.s3.amazonaws.com/dataanalysis/loansData.csv', { allowPrivateDomains: true });tldts offers dedicated methods to extract the Public Suffix, domain,
subdomain, etc. without having to rely on the more generic parse function.
This is also more efficient than calling parse, because less work as to be
done.
const {
getHostname,
getDomain,
getPublicSuffix,
getSubdomain,
getDomainWithoutSuffix,
} = require('tldts');
const url = 'https://spark-public.s3.amazonaws.com';
console.log(getHostname(url)); // spark-public.s3.amazonaws.com
console.log(getDomain(url, { allowPrivateDomains: true })); // spark-public.s3.amazonaws.com
console.log(getPublicSuffix(url, { allowPrivateDomains: true })); // s3.amazonaws.com
console.log(getSubdomain(url, { allowPrivateDomains: true })); // ''
console.log(getDomainWithoutSuffix(url, { allowPrivateDomains: true })); // spark-publictldts is based upon the excellent tld.js library and would not exist without
the many contributors who worked on the project.
This project would not be possible without the amazing Mozilla's public suffix list either. Thank you for your hard work!