Here’s the complete configuration of the Symfony bundle with including default values:
# app/config/config.yml
api_platform:
    # The title of the API.
    title: ''
    # The description of the API.
    description: ''
    # The version of the API.
    version: '0.0.0'
    # Specify a name converter to use.
    name_converter: ~
    # Specify a path name generator to use.
    path_segment_name_generator: 'api_platform.path_segment_name_generator.underscore'
    eager_loading:
        # To enable or disable eager loading.
        enabled: true
        # Fetch only partial data according to serialization groups.
        # If enabled, Doctrine ORM entities will not work as expected if any of the other fields are used.
        fetch_partial: false
        # Max number of joined relations before EagerLoading throws a RuntimeException.
        max_joins: 30
        # Force join on every relation.
        # If disabled, it will only join relations having the EAGER fetch mode.
        force_eager: true
    # Enable the FOSUserBundle integration.
    enable_fos_user: false
    # Enable the Nelmio Api doc integration.
    enable_nelmio_api_doc: false
    # Enable the Swagger documentation and export.
    enable_swagger: true
    # Enable Swagger ui.
    enable_swagger_ui: true
    oauth:
        # To enable or disable oauth.
        enabled: false
        # The oauth client id.
        clientId: ''
        # The oauth client secret.
        clientSecret: ''
        # The oauth type.
        type: 'oauth2'
        # The oauth flow grant type.
        flow: 'application'
        # The oauth token url.
        tokenUrl: '/oauth/v2/token'
        # The oauth authentication url.
        authorizationUrl: '/oauth/v2/auth'
        # The oauth scopes.
        scopes: []
    swagger:
        # The swagger api keys.
        api_keys: []
    collection:
        # The default order of results.
        order: 'ASC'
        # The name of the query parameter to order results.
        order_parameter_name: 'order'
        pagination:
            # To enable or disable pagination for all resource collections by default.
            enabled: true
            # To allow the client to enable or disable the pagination.
            client_enabled: false
            # To allow the client to set the number of items per page.
            client_items_per_page: false
            # The default number of items per page.
            items_per_page: 30
            # The maximum number of items per page.
            maximum_items_per_page: ~
            # The default name of the parameter handling the page number.
            page_parameter_name: 'page'
            # The name of the query parameter to enable or disable pagination.
            enabled_parameter_name: 'pagination'
            # The name of the query parameter to set the number of items per page.
            items_per_page_parameter_name: 'itemsPerPage'
    mapping:
        # The list of paths with files or directories where the bundle will look for additional resource files.
        paths: []
    # The list of your resources class directories. Defaults to the directories of the mapping paths but might differ.
    resource_class_directories:
        - '%kernel.project_dir%/src/Entity'
    http_cache:
        # Automatically generate etags for API responses.
        etag: true
        # Default value for the response max age.
        max_age: ~
        # Default value for the response shared (proxy) max age.
        shared_max_age: ~
        # Default values of the "Vary" HTTP header.
        vary: ['Accept']
        # To make all responses public by default.
        public: ~
        invalidation:
          # To enable the tags-based cache invalidation system.
          enabled: false
          # URLs of the Varnish servers to purge using cache tags when a resource is updated.
          varnish_urls: []
    # The list of exceptions mapped to their HTTP status code.
    exception_to_status:
        # With a status code.
        Symfony\Component\Serializer\Exception\ExceptionInterface: 400
        # Or with a constant defined in the 'Symfony\Component\HttpFoundation\Response' class.
        ApiPlatform\Core\Exception\InvalidArgumentException: !php/const:Symfony\Component\HttpFoundation\Response::HTTP_BAD_REQUEST
        # ...
    # The list of enabled formats. The first one will be the default.
    formats:
        jsonld:
            mime_types: ['application/ld+json']
        json:
            mime_types: ['application/json']
        html:
            mime_types: ['text/html']
        # ...
    # The list of enabled error formats. The first one will be the default.
    error_formats:
        jsonproblem:
            mime_types: ['application/problem+json']
        jsonld:
            mime_types: ['application/ld+json']
        # ...You can also help us improve the documentation of this page.
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