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A JavaScript library for linkification stuff. Used by linkify-plus-plus.

This script should not be not be installed directly. It is a library for other scripts to include with the meta directive // @require

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Applies to
All sites

Author's Description

Linkify Plus Plus Core

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A JavaScript library for linkification stuff. Used by linkify-plus-plus.



This module exports 2 classes.

  • UrlMatcher - an URL matcher which can match almost all types of links from a string.
  • Linkifier - to run linkification on an element.


npm install -S linkify-plus-plus-core
var {UrlMatcher, Linkifier} = require("linkify-plus-plus-core");
// or use the matcher only
var {UrlMatcher} = require("linkify-plus-plus-core/lib/url-matcher")

There is also a browserified standalone build in dist folder, which can be included in your html directly.

<script src="path/to/linkify-plus-plus-core.js"></script>
// access the module with "linkifyPlusPlusCore" global
var {UrlMatcher, Linkifier} = linkifyPlusPlusCore;


<script src=""></script>


// create a matcher
var matcher = new UrlMatcher();

for (var link of matcher.match(text)) {
    // matcher.match() returns a generator, yielding an object for each match result
    console.log(link.start, link.end, link.text, link.url);
// Linkifier needs a matcher to work
var linkifier = new Linkifier(document.body, {matcher: matcher});

// Linkifier will walk through the DOM tree, match url against all text nodes, and replace them with anchor element.
linkifier.on("complete", elapse => {
    console.log(`finished in ${elapse}ms`);
linkifier.on("error", err => {
    console.log("failed with error:", err);

// It is suggested to use `linkify()` function which wraps Linkifier to a promise.
linkify(document.body, {matcher}).then(onComplete, onError);

API references

This module exports

  • UrlMatcher - a class to find link from string
  • Linkifier - a class to linkify elements
  • linkify - a function wrapping Linkifier. Return a promise.
  • INVALID_TAGS - a table of uppercase tag name, which are invalid ancestors for <a> element.


new UrlMatcher([options: object])

The options object, all properties are optional:

  • options.fuzzyIp: boolean, default:true - match 4 digits IP, which often looks like version numbers.
  • options.ignoreMustache: boolean, default:false - ignore links inside mustache "{{", "}}". This is useful to work with other template library like Vue.js.
  • options.unicode: boolean, default:false - match unicode character.
  • options.customRules: array of string, default:[] - a list of regex pattern (in string). E.g. ["file:///\\S+", "magnet:\\?\\S+"]
  • options.standalone: boolean, default:false - the link must be surrounded by whitespace.
  • options.boundaryLeft: string - works with standalone option. Allow some characters to be placed between whitespace and link. Some common characters are {[("'.
  • options.boundaryRight: string - works with standalone option. Allow some characters to be placed between whitespace and link. Some common characters are '")]},.;?!.

UrlMatcher.prototype.match(text: string): generator

This generator yields matched result. The result object:

  • result.start: integer - the start position of the url.
  • result.end: integer - the end position of the url.
  • result.text: string - the matched text.
  • result.url: string - the url of the link. .url doesn't always equal .text, that .text might lack of the protocol but .url is always a full URL.
  • result.custom: boolean - indicate if the result is matched by custom rules.

There are also some properties for each parts of the URL: .protocol, .auth, .domain, .port, .path.


This class extends event-lite.

new Linkifier([root: element, ] options: object)

  • root: the element to be linkified.

The options object:

  • options.matcher: URLMatcher, required.

Any object having a .match method, which accepts a string and returns an iterable of matched result, should work.

The match result must have .start, .end, .text, and .url properties described above.

  • options.validator: function, optional.

A function recieving an element and returning a boolean to decide if the element should be linkified. Note that the elements in INVALID_TAGS are already filtered out before the validator.

  • options.newTab: boolean, default:true - add target="_blank" to the link.
  • options.noOpener: boolean, default:true - add rel="noopener" to the link.
  • options.root: element - if root argument is omitted, this value is adopted.
  • options.embedImage: boolean, default:true - create <img> for the link if the url looks like an image.
  • options.maxRunTime: number, default:100 - in milliseconds. The linkify process is splited into small chunks to avoid blocking. This is the max running time of each chunk.
  • options.timeout: number, default:10000 - in milliseconds. If linkification have processed over this value, an error is raised. Note that any heavy work between each chunks are counted as in timeout too.


Start linkification. The linkifier would walk through the DOM tree, collect text nodes and <wbr> tags, match URLs with matcher, and convert them into links.


Abort linkification.


Linkifier emits following events, which could be listened with .on:

  • complete - emitted when the linkification completed. Listener arguments:

    • elapse: number. Time in milliseconds that Linkifier take to complete.
  • error - emitted when the linkification failed. Listener arguments:

    • error: The error.
  • link - emitted when a link is created. You can alter the style, or implement your link builder to replace the default one. Listener arguments:

    • An object containing following properties:
    • result: the result object generated by UrlMatcher.match()
    • range: Range. The text range linkifier is working on. Do not change the range unless you know what you are doing.
    • link: AnchorElement.
    • content: DocumentFragment. The text (including <wbr> tags) extract from matched text range, which is usually used as the content of the link.

linkify([root: element, ] options: object) -> Promise

A convenient function to setup Linkifier. See Linkifier for the arguments. Additionally, if option object has some keys starting with on, the function treats them as event listeners. You can register event listeners like:

  onlink: ({link}) => {...}

Other notes


In the very old days, the script is based on Linkify Plus. Although it has been rewritten multiple times, the original license can be found here.

TLD list is grabbed from

TLD count is grabbed from


  • Version 0.3.0 (Aug 23, 2017):

    • Drop: Linkifier.prototype.linkify. Now Linkifier uses event pattern.
    • Add linkify function.
    • Update TLDs.
  • Version 0.2.0 (Mar 4, 2017):

    • Use standalone build instead of require.
    • Fix: blocking bug with large element without matching urls.
  • Version 0.1.0 (Feb 23, 2017):

    • First release