# Plugins extension

Strapi comes with plugins that can be installed from the Marketplace or as npm packages. You can also create your own plugins (see plugins development) or extend the existing ones.

Plugin extensions code is located in the ./src/extensions folder (see project structure). Some plugins automatically create files there, ready to be modified.

Example of extensions folder structure: 
/extensions
  /some-plugin-to-extend
    strapi-admin.js
    strapi-server.js
    /content-types
      /some-content-type-to-extend
        model.json
      /another-content-type-to-extend
        model.json
  /another-plugin-to-extend
    strapi-admin.js

Plugins can be extended in 2 ways:

A plugin's Content-Types can be extended in 2 ways: using the programmatic interface within strapi-server.js and by overriding the content-types schemas.

The final schema of the content-types depends on the following loading order:

  1. the content-types of the original plugin,
  2. the content-types overriden by the declarations in the schema defined in ./src/extensions/plugin-name/content-types/content-type-name/schema.json
  3. the content-types declarations in the content-types key exported from strapi-server.js
  4. the content-types declarations in the register() function of the Strapi application

️❗️ WARNING

New versions of Strapi are released with migration guides, but these guides might not cover unexpected breaking changes in your plugin extensions. Consider forking a plugin if extensive customizations are required.

# Extending a plugin's Content-Types

To overwrite a plugin's Content-Types:

  1. (optional) Create the ./src/extensions folder at the root of the app, if the folder does not already exist.
  2. Create a subfolder with the same name as the plugin to be extended.
  3. Create a content-types subfolder.
  4. Inside the content-types subfolder, create another subfolder with the same singularName as the content-type to overwrite.
  5. Inside this content-types/name-of-content-type subfolder, define the new schema for the Content-Type in a schema.json file (see schema documentation).
  6. (optional) Repeat steps 4 and 5 for each Content-Type to overwrite.

# Extending a plugin's interface

When a Strapi application is initializing, plugins, extensions and global lifecycle functions events happen in the following order:

  1. Plugins are loaded and their interfaces are exposed.
  2. Files in ./src/extensions are loaded.
  3. The register() and bootstrap() functions in ./src/index.js are called.

A plugin's interface can be extended at step 2 (i.e. within ./src/extensions) or step 3 (i.e. inside ./src/index.js).

# Within the extensions folder

To extend a plugin's interface using the ./src/extensions folder:

  1. (optional) Create the ./src/extensions folder at the root of the app, if the folder does not already exist.
  2. Create a subfolder with the same name as the plugin to be extended.
  3. Depending on what needs to be extended:
    • create a strapi-server.js file to extend a plugin's back end using the Server API
    • or create a strapi-admin.js file to extend the admin panel with the Admin Panel API.
  4. Within this file, define and export a function. The function receives the plugin interface as an argument so it can be extended.
Example of backend extension 
// path: ./src/extensions/some-plugin-to-extend/strapi-server.js

module.exports = (plugin) => {
  plugin.controllers.controllerA.find = (ctx) => {};

  plugin.policies[newPolicy] = (ctx) => {};

  plugin.routes.push({
    method: 'GET',
    path: '/route-path',
    handler: 'controller.action',
  });

  return plugin;
};

# Within the register and bootstrap functions

To extend a plugin's interface within ./src/index.js, use the bootstrap() and register() functions of the whole project, and access the interface programmatically with getters.

Example of extending a plugin's content-type within ./src/index.js 
// path: ./src/index.js

module.exports = {
  register({ strapi }) {
    strapi.contentType('plugin::my-plugin.content-type-name').attributes = {
      'toto': {
        type: 'string',
      }
    }
  },
  bootstrap({ strapi }) {},
};

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