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Howtos on various subjects / Installing Local Extensions

Note: You are currently reading the documentation for Bolt 2.2. Looking for the documentation for Bolt 3.4 instead?

Bolt supports installation of extensions that are not included on Bolt's extensions site.

There are a couple of caveats:

  • There is no autoloader by default
  • Autoloading is available for Bolt 2.2+, but not guaranteed unless you have a properly defined "psr-4" section in your extension's composer.json file
  • Must be located in {web_root}/extensions/local/{author_name}/{extension_name}/
  • They will be automatically enabled if the directories above exist and contain init.php and Extension.php
  • Updates are not available though the web UI

Note: If your local extension requires libraries from Packagist, simply add them to the composer.json in the root directory of your Bolt install and perform a composer install.

Step 1

Create the directory for you extension in {web_root}/extensions/local/{author_name}/{extension_name}/


  • {web_root} is the install location of your Bolt site
  • {author_name} is a lower-case, space-less name
  • {extension_name} is a lower-case, space-less name

Step 2

Create a composer.json to guarantee autoloding as:

    "name": "{author_name}/{extension_name}",
    "description": "A description about your extension should go here.",
    "type": "bolt-extension",
    "require": {
        "bolt/bolt": ">=2.0.0,<3.0.0"
    "authors": [
            "name": "Your Name",
            "email": "your@email.com"
    "autoload": {
        "files": [
        "psr-4": {
            "Bolt\\Extension\\MyName\\MyExtension\\": ["", "src/"]


  • {author_name} is a lower-case, space-less name
  • {extension_name} is a lower-case, space-less name
  • MyName is a camel-case, space-less name
  • MyExtension is a camel-case, space-less name
  • The provided name spaces must use \\ double backslash separators
  • The provided name spaces end with \\ double backslash separators as per the PSR-4 standard
  • The path value may be either:
    • A string, e.g. "src/", where only one directory is required
    • An array, e.g. ["", "src/"], where multiple directories are required

Step 3

Create an Extension.php file that contains something like this:

namespace Bolt\Extension\MyName\MyExtension;

use Bolt;

class Extension extends \Bolt\BaseExtension

    public function getName()
        return "MyExtension";

    public function initialize()
        // Your extension gets launched from here

Step 4

Create an init.php file that contains something like this:

use Bolt\Extension\MyName\MyExtension\Extension;

$app['extensions']->register(new Extension($app));
  • Your extension should now appear in the Extend page in the "Your Currently Installed Extensions" section on your Bolt site


Many times developers create the extension locally and import changes and updates (e.g. via git pull).

In doing this, the PHP namespace may change, potentially triggering a fatal error because the autoloader does not get updated automatically, for performance reasons.

If this occurs, there are several approaches to fixing this but the first thing you should do is temporarily rename the extension's init.php file and try the following in order:

  • Dumping the Bolt cache using Nut ./app/nut cache:clear, and then loading the backend. This will tell Bolt to rescan the local extension composer.json files for PSR-4 autoload data, import that into extensions/composer.json and rebuild the extension autoloader.

  • Performing a composer dumpautoload in the extensions/ directory of your Bolt install.

At this point, it should be safe to rename the init.php file back to normal and enjoy your updated extension.

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