PHP's parse_url in JavaScript

Here’s what our current JavaScript equivalent to PHP's parse_url looks like.

module.exports = function parse_url (str, component) { // eslint-disable-line camelcase
// discuss at:
// original by: Steven Levithan (
// reimplemented by: Brett Zamir (
// input by: Lorenzo Pisani
// input by: Tony
// improved by: Brett Zamir (
// note 1: original by
// note 1: blog post at
// note 1: demo at
// note 1: Does not replace invalid characters with '_' as in PHP,
// note 1: nor does it return false with
// note 1: a seriously malformed URL.
// note 1: Besides function name, is essentially the same as parseUri as
// note 1: well as our allowing
// note 1: an extra slash after the scheme/protocol (to allow file:/// as in PHP)
// example 1: parse_url('https://user:pass@host/path?a=v#a')
// returns 1: {scheme: 'https', host: 'host', user: 'user', pass: 'pass', path: '/path', query: 'a=v', fragment: 'a'}
// example 2: parse_url('')
// returns 2: {scheme: 'https', host: '', path: '/wiki/%22@%22_%28album%29'}
// example 3: parse_url('https://host.domain.tld/a@b.c/folder')
// returns 3: {scheme: 'https', host: 'host.domain.tld', path: '/a@b.c/folder'}
// example 4: parse_url('')
// returns 4: { scheme: 'https', host: '', path: '/a@b.c/folder', query: 'foo=bar', user: 'gooduser', pass: 'secretpassword' }
let query
const mode = (typeof require !== 'undefined' ? require('../info/ini_get')('locutus.parse_url.mode') : undefined) || 'php'
const key = [
// For loose we added one optional slash to post-scheme to catch file:/// (should restrict this)
let parser = {
php: new RegExp([
strict: new RegExp([
loose: new RegExp([
const m = parser[mode].exec(str)
const uri = {}
let i = 14
while (i--) {
if (m[i]) {
uri[key[i]] = m[i]
if (component) {
return uri[component.replace('PHP_URL_', '').toLowerCase()]
if (mode !== 'php') {
const name = (typeof require !== 'undefined' ? require('../info/ini_get')('locutus.parse_url.queryKey') : undefined) || 'queryKey'
parser = /(?:^|&)([^&=]*)=?([^&]*)/g
uri[name] = {}
query = uri[key[12]] || ''
query.replace(parser, function ($0, $1, $2) {
if ($1) {
uri[name][$1] = $2
delete uri.source
return uri
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How to use

You you can install via npm install locutus and require it via require('locutus/php/url/parse_url'). You could also require the url module in full so that you could access url.parse_url instead.

If you intend to target the browser, you can then use a module bundler such as Parcel, webpack, Browserify, or rollup.js. This can be important because Locutus allows modern JavaScript in the source files, meaning it may not work in all browsers without a build/transpile step. Locutus does transpile all functions to ES5 before publishing to npm.

A community effort

Not unlike Wikipedia, Locutus is an ongoing community effort. Our philosophy follows The McDonald’s Theory. This means that we don't consider it to be a bad thing that many of our functions are first iterations, which may still have their fair share of issues. We hope that these flaws will inspire others to come up with better ideas.

This way of working also means that we don't offer any production guarantees, and recommend to use Locutus inspiration and learning purposes only.



Please note that these examples are distilled from test cases that automatically verify our functions still work correctly. This could explain some quirky ones.

#codeexpected result
1parse_url('https://user:pass@host/path?a=v#a'){scheme: 'https', host: 'host', user: 'user', pass: 'pass', path: '/path', query: 'a=v', fragment: 'a'}
2parse_url(''){scheme: 'https', host: '', path: '/wiki/%22@%22_%28album%29'}
3parse_url('https://host.domain.tld/a@b.c/folder'){scheme: 'https', host: 'host.domain.tld', path: '/a@b.c/folder'}
4parse_url(''){ scheme: 'https', host: '', path: '/a@b.c/folder', query: 'foo=bar', user: 'gooduser', pass: 'secretpassword' }

« More PHP url functions