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Run composer --version in the terminal or command prompt; if Composer is installed, it will display the version number. 2. If you receive a 'command not found' or similar error, Composer is not installed or not in the system’s PATH. 3. Alternatively, use composer help to check for the help menu as confirmation of installation. 4. Optionally, use which composer on macOS/Linux or where composer on Windows to verify the installation path. If using a local composer.phar, run php composer.phar --version instead. Running composer --version and receiving a version number is the most reliable method to confirm successful installation.
To check if Composer is installed on your system, follow these simple steps:

1. Use the Command Line (Terminal or Command Prompt)
Open your terminal (macOS/Linux) or command prompt/PowerShell (Windows) and run:
composer --version
If Composer is installed, you’ll see output similar to:

Composer version 2.7.7 2025-08-03 08:35:19
This confirms Composer is installed and shows the version number.
2. Check for "Command Not Found" Error
If you see an error like:

composer: command not found
(macOS/Linux)'composer' is not recognized as an internal or external command
(Windows)
Then Composer is not installed or not properly added to your system’s PATH.
3. Alternative: Test with a Composer Command
You can also run:
composer help
This will display the help menu if Composer is available. It’s another way to verify the installation.
4. Verify Installation Location (Optional)
To see where Composer is installed, use:
which composer # On macOS/Linux
where composer # On Windows (in Command Prompt)
This shows the path to the Composer executable, confirming it’s accessible in your environment.
Note: If you're using a local installation (e.g., composer.phar
), you may need to run it with PHP:
php composer.phar --version
In that case, only composer
alone won’t work unless it's globally set up.
Basically, just running composer --version
is the quickest and most reliable way. If it returns a version number, you're good to go.
The above is the detailed content of How to check if Composer is installed?. For more information, please follow other related articles on the PHP Chinese website!

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