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This page is a translated version of the page J4.x:Setting Up Your Local Environment and the translation is 26% complete.

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如何為 Joomla 4 設定本機環境

With Joomla 4 we have changed the development process, it is no longer possible to clone the repository and have a usable Joomla installation. We follow here best practices and have implemented a build process for the CMS.


What you have to do to setup you dev environment depends on your operating system. We can not write documentation for any OS so you should answer your favorite search engine to find a HowTo.


  1. PHP - basically the same as you need for running a Joomla Site, but you need the PHP CLI (command line interface) Version (see the Configuring a LAMPP server for PHP development page)
  2. Composer - for managing Joomla's PHP Dependencies - for help installing Composer read the documentation at https://getcomposer.org/doc/00-intro.md
  3. Node.js - for compiling Joomla's JavaScript and SASS files - for help installing Node.js please follow the instructions available on https://nodejs.org/en/
  4. Git - 管理版本差異用


  1. Clone the repository
  2. run composer install from the root of the git repo (you can add --ignore-platform-reqs if you don't have the PHP-LDAP locally installed and you don't need it)
  3. run npm ci from the root of the git repo (note you need npm 5.7 or higher for this. Run npm install -g npm@lts to upgrade your version of npm to the lts version)

Linux and OSX users can set up the following bash alias by placing the following inside the ~/.bashrc file:

alias jinstall="rm -rf administrator/templates/atum/css; rm -rf templates/cassiopeia/css; rm -rf media/; rm -rf node_modules/; rm -rf libraries/vendor/; composer install; npm ci; git checkout -- libraries/vendor/.htaccess"

This will wipe all the compiled files in your system and run a fresh install as one command by calling jinstall inside your Joomla install.


Joomla is not different to many other web tools these days. It has a large PHP part and it has more and more JavaScript code. While PHP coding doesn't need so much preparation, JavaScript needs a lot tooling around. The main reason is that nobody writes code in a way that every browser understands, so the code needs transpiling from e.g. ES6 to a compatible version of JavaScript. The same is true for CSS, for Joomla we are using SASS and this will be converted to native CSS so that any browser understands it. As downside setting up a dev environment is a bit more complicated but the tooling make coding also more convenient. Thanks to watchers and browser auto reload you can see your change in real time.


It should be enough to run composer install as this will install PHP dependencies saved in the composer.lock file. You can do this as many times as you like, it will only install new packages when the composer.lock file is changed. Don't run composer update as this will update all packages to newer versions and update the composer.lock file.

Note: You may need to run composer install with the --ignore-platform-reqs option to ignore platform requirements specified in Composer, i.e. if you do not have PHP's LDAP extension installed.

Node/npm 函式

Node.js comes with a package manager called NPM (in some way the same as Composer). NPM has a run command and we have prepared some scripts to make your life easier. You have to run the commands for the root of the repository

npm run build:css

It will compile SASS files to CSS and also create the minified files.

npm run build:js

It will compile and transpile the JavaScript files to the correct format and create minified files

npm run watch:css

This is the same as the build:css command but will watch for changes and automatically build updated files.

npm run watch:js

This is the same as the build:js command but will watch for changes and automatically build updated files.

npm run 測試

npm run test

This will run other JavaScript testing suite.

Possible Issues

If you receive a login error such as shown below, then delete the \library\autoload_psr4.php file as shown in the second image. Login After Install Error autoload_psr4.php