Links recognition library with FULL unicode support


Links recognition library with FULL unicode support. Focused on high quality link patterns detection in plain text.


Why it's awesome:

  • Full unicode support, with astral characters!
  • International domains support.
  • Allows rules extension & custom normalizers.


npm install linkify-it --save

Browserification is also supported.

Usage examples

Example 1
var linkify = require('linkify-it')();

// Reload full tlds list & add unofficial `.onion` domain.
  .tlds(require('tlds'))          // Reload with full tlds list
  .tlds('onion', true)            // Add unofficial `.onion` domain
  .add('git:', 'http:')           // Add `git:` protocol as "alias"
  .add('ftp:', null)              // Disable `ftp:` protocol
  .set({ fuzzyIP: true });        // Enable IPs in fuzzy links (without schema)

console.log(linkify.test('Site!'));  // true

console.log(linkify.match('Site!')); // [ {
                                                //   schema: "",
                                                //   index: 5,
                                                //   lastIndex: 15,
                                                //   raw: "",
                                                //   text: "",
                                                //   url: "",
                                                // } ]
Example 2. Add twitter mentions handler
linkify.add('@', {
  validate: function (text, pos, self) {
    var tail = text.slice(pos);

    if (! { =  new RegExp(
        '^([a-zA-Z0-9_]){1,15}(?!_)(?=$|' + + ')'
    if ( {
      // Linkifier allows punctuation chars before prefix,
      // but we additionally disable `@` ("@@mention" is invalid)
      if (pos >= 2 && tail[pos - 2] === '@') {
        return false;
      return tail.match([0].length;
    return 0;
  normalize: function (match) {
    match.url = '' + match.url.replace(/^@/, '');


API documentation

new LinkifyIt(schemas, options)

Creates new linkifier instance with optional additional schemas. Can be called without newkeyword for convenience.

By default understands:

  • http(s)://..., ftp://..., mailto:...& //...links
  • "fuzzy" links and emails (,

schemasis an object, where each key/value describes protocol/rule:

  • key- link prefix (usually, protocol name with :at the end, skype:for example). linkify-itmakes sure that prefix is not preceded with alphanumeric char.
  • value- rule to check tail after link prefix
    • String- just alias to existing rule
    • Object
      • validate- either a RegExp(start with ^, and don't include the link prefix itself), or a validator function which, given arguments text_, _pos_, and _self_, returns the length of a match in _textstarting at index pos. posis the index right after the link prefix. selfcan be used to access the linkify object to cache data.
      • normalize- optional function to normalize text & url of matched result (for example, for twitter mentions).


  • fuzzyLink- recognize URL-s without http(s)://head. Default true.
  • fuzzyIP- allow IPs in fuzzy links above. Can conflict with some texts like version numbers. Default false.
  • fuzzyEmail- recognize emails without mailto:prefix. Default true.
  • ---- set trueto terminate link with ---(if it's considered as long dash).


Searches linkifiable pattern and returns trueon success or falseon fail.


Quick check if link MAY BE can exist. Can be used to optimize more expensive .test()calls. Return falseif link can not be found, true- if .test()call needed to know exactly.

.testSchemaAt(text, name, offset)

Similar to .test()but checks only specific protocol tail exactly at given position. Returns length of found pattern (0 on fail).


Returns Arrayof found link matches or null if nothing found.

Each match has:

  • schema- link schema, can be empty for fuzzy links, or //for protocol-neutral links.
  • index- offset of matched text
  • lastIndex- index of next char after mathch end
  • raw- matched text
  • text- normalized text
  • url- link, generated from matched text

.tlds(list[, keepOld])

Load (or merge) new tlds list. Those are needed for fuzzy links (without schema) to avoid false positives. By default:

  • 2-letter root zones are ok.
  • biz|com|edu|gov|net|org|pro|web|xxx|aero|asia|coop|info|museum|name|shop|рф are ok.
  • encoded (xn--...) root zones are ok.

If that's not enough, you can reload defaults with more detailed zones list.

.add(key, value)

Add a new schema to the schemas object. As described in the constructor definition, keyis a link prefix (skype:, for example), and valueis a String to alias to another schema, or an Object with validateand optionally normalizedefinitions. To disable an existing rule, use .add(key, null).


Override default options. Missed properties will not be changed.







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