Composer Error while installing Laravel "Failed to decode response: zlib_decode(): data error"
Stefan Izdrail
Founder & Senior Architect · 2026-06-29
Title: Troubleshooting Composer Installation Issues: Resolving "Failed to Decode Response: zlib_decode(): data error" in Laravel Projects
Body:
Creating a new Laravel project is a common task for many developers, but sometimes errors can occur during the installation process. In this comprehensive blog post, we'll discuss the "Failed to decode response: zlib_decode(): data error" issue and provide solutions to address it so that you can continue working on your projects without any further problems.
Before diving into the details of this issue, let us first understand what exactly is happening when we run the command `composer create-project laravel/laravel myproject --prefer-dist` in our local development environment.
Composer is the package manager for PHP, which allows you to manage libraries and dependencies efficiently. In this case, we're creating a new Laravel project by specifying the base directory where the installation will take place. The `--prefer-dist` option ensures that only the latest stable releases are installed rather than any pre-release or development versions.
Now let's examine the problem: "Failed to decode response: zlib_decode(): data error". This error occurs when Composer is unable to decrypt a remote file successfully due to an issue with the zip algorithm (zlib) used for compression. The reason behind this can be anything from network issues, proxy settings, or other environmental factors that affect how Composer communicates with its repositories.
Following are some solutions you can try in order to resolve this issue:
1. Check your internet connection and ensure a stable connection is available for the installation process.
2. Ensure that you have the latest version of Composer installed on your system by running `composer self-update`. If any updates are available, install them promptly.
3. Verify that you're using the proper command to create a new Laravel project as per the documentation (https://laravel.com/docs/5.7/installation#creating-an-app).
4. Try creating your Laravel project in a different directory and verify whether the error persists or not. If it does, contact your system administrator to ensure that all necessary permissions are set correctly for your account.
5. Check if there is any firewall or antivirus software installed on your machine that might be blocking Composer's access to its repositories. In such cases, temporarily disable these programs and repeat the installation process. After successful completion, you can re-enable them.
6. If none of the above solutions work for you, try running the command with an option to disable SSL verification (`--no-check-verify`). This will allow Composer to download packages without any checks on the authenticity of remote connections:
composer create-project laravel/laravel myproject --no-check-verify --prefer-dist
By following these troubleshooting steps, you should be able to address the "Failed to decode response: zlib_decode(): data error" issue in your Laravel project. For more guidance on using Composer and Laravel, refer to our comprehensive guides at https://laravelcompany.com/blog/.
Conclusion: The "Failed to decode response: zlib_decode(): data error" issue can arise due to a variety of reasons, ranging from network issues and proxy settings to incorrect folder permissions or security software interfering with the process. By following these solutions and best practices, you'll be able to create your Laravel projects smoothly without any further setbacks.