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An RFC 3986/3987 compliant, scheme extendable URI/IRI parsing/validating/resolving library for JavaScript.


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URI.js is an RFC 3986 compliant, scheme extendable URI parsing/validating/resolving library for all JavaScript environments (browsers, Node.js, etc). It is also compliant with the IRI (RFC 3987), IDNA (RFC 5890), IPv6 Address (RFC 5952), IPv6 Zone Identifier (RFC 6874) specifications.

URI.js has an extensive test suite, and works in all (Node.js, web) environments. It weighs in at 6.4kb (gzipped, 17kb deflated).



URI.parse("uri://user:[email protected]:123/one/two.three?q1=a1&q2=a2#body"); //returns: //{ // scheme : "uri", // userinfo : "user:pass", // host : "", // port : 123, // path : "/one/two.three", // query : "q1=a1&q2=a2", // fragment : "body" //}


URI.serialize({scheme : "http", host : "", fragment : "footer"}) === ""


URI.resolve("uri://a/b/c/d?q", "../../g") === "uri://a/g"


URI.normalize("HTTP://") === ""


URI.equal("example://a/b/c/%7Bfoo%7D", "eXAMPLE://a/./b/../b/%63/%7bfoo%7d") === true

IP Support

//IPv4 normalization URI.normalize("//") === "//" //IPv6 normalization URI.normalize("//[2001:0:0DB8::0:0001]") === "//[2001:0:db8::1]" //IPv6 zone identifier support URI.parse("//[2001:db8::7%25en1]"); //returns: //{ // host : "2001:db8::7%en1" //}

IRI Support

//convert IRI to URI URI.serialize(URI.parse("http://examplé.org/rosé")) === "" //convert URI to IRI URI.serialize(URI.parse(""), {iri:true}) === "http://examplé.org/rosé"


All of the above functions can accept an additional options argument that is an object that can contain one or more of the following properties:

  • scheme (string)

    Indicates the scheme that the URI should be treated as, overriding the URI's normal scheme parsing behavior.

  • reference (string)

    If set to "suffix", it indicates that the URI is in the suffix format, and the validator will use the option's scheme property to determine the URI's scheme.

  • tolerant (boolean, false)

    If set to true, the parser will relax URI resolving rules.

  • absolutePath (boolean, false)

    If set to true, the serializer will not resolve a relative path component.

  • iri (boolean, false)

    If set to true, the serializer will unescape non-ASCII characters as per RFC 3987.

  • unicodeSupport (boolean, false)

    If set to true, the parser will unescape non-ASCII characters in the parsed output as per RFC 3987.

  • domainHost (boolean, false)

    If set to true, the library will treat the host component as a domain name, and convert IDNs (International Domain Names) as per RFC 5891.

Scheme Extendable

URI.js supports inserting custom scheme dependent processing rules. Currently, URI.js has built in support for the following schemes:


URI.equal("HTTP://ABC.COM:80", "") === true URI.equal("", "HTTPS://ABC.COM:443/") === true

WS/WSS Support

URI.parse("wss://"); //returns: //{ // scheme : "wss", // host: "", // resourceName: "/foo?bar=baz", // secure: true, //} URI.equal("WS://ABC.COM:80/chat#one", "ws://") === true

Mailto Support

URI.parse("mailto:[email protected],[email protected]?subject=SUBSCRIBE&body=Sign%20me%20up!"); //returns: //{ // scheme : "mailto", // to : ["[email protected]", "[email protected]"], // subject : "SUBSCRIBE", // body : "Sign me up!" //} URI.serialize({ scheme : "mailto", to : ["[email protected]"], subject : "REMOVE", body : "Please remove me", headers : { cc : "[email protected]" } }) === "mailto:[email protected][email protected]&subject=REMOVE&body=Please%20remove%20me"

URN Support

URI.parse("urn:example:foo"); //returns: //{ // scheme : "urn", // nid : "example", // nss : "foo", //}
URN UUID Support
URI.parse("urn:uuid:f81d4fae-7dec-11d0-a765-00a0c91e6bf6"); //returns: //{ // scheme : "urn", // nid : "uuid", // uuid : "f81d4fae-7dec-11d0-a765-00a0c91e6bf6", //}


To load in a browser, use the following tag:

<script type="text/javascript" src="uri-js/dist/es5/uri.all.min.js"></script>

To load in a CommonJS/Module environment, first install with npm/yarn by running on the command line:

npm install uri-js # OR yarn add uri-js

Then, in your code, load it using:

const URI = require("uri-js");

If you are writing your code in ES6+ (ESNEXT) or TypeScript, you would load it using:

import * as URI from "uri-js";

Or you can load just what you need using named exports:

import { parse, serialize, resolve, resolveComponents, normalize, equal, removeDotSegments, pctEncChar, pctDecChars, escapeComponent, unescapeComponent } from "uri-js";

Breaking changes

Breaking changes from 3.x

URN parsing has been completely changed to better align with the specification. Scheme is now always urn, but has two new properties: nid which contains the Namspace Identifier, and nss which contains the Namespace Specific String. The nss property will be removed by higher order scheme handlers, such as the UUID URN scheme handler.

The UUID of a URN can now be found in the uuid property.

Breaking changes from 2.x

URI validation has been removed as it was slow, exposed a vulnerabilty, and was generally not useful.

Breaking changes from 1.x

The errors array on parsed components is now an error string.



What is uri-js?

An RFC 3986/3987 compliant, scheme extendable URI/IRI parsing/validating/resolving library for JavaScript.

Is uri-js popular?

The npm package uri-js receives a total of 22,811,107 weekly downloads. As such, uri-js popularity was classified as popular.

Is uri-js well maintained?

We found that uri-js demonstrated a not healthy version release cadence and project activity because the last version was released a year ago.It has 1 open source maintainer collaborating on the project.

Last updated on 10 Jan 2021

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