.. _introspection:

Introspection
=============

Datasette includes some pages and JSON API endpoints for introspecting the current instance. These can be used to understand some of the internals of Datasette and to see how a particular instance has been configured.

Each of these pages can be viewed in your browser. Add ``.json`` to the URL to get back the contents as JSON.

.. _JsonDataView_metadata:

/-/metadata
-----------

Shows the contents of the ``metadata.json`` file that was passed to ``datasette serve``, if any. `Metadata example <https://fivethirtyeight.datasettes.com/-/metadata>`_:

.. code-block:: json

    {
        "license": "CC Attribution 4.0 License",
        "license_url": "http://creativecommons.org/licenses/by/4.0/",
        "source": "fivethirtyeight/data on GitHub",
        "source_url": "https://github.com/fivethirtyeight/data",
        "title": "Five Thirty Eight",
        "databases": {

        }
    }

.. _JsonDataView_versions:

/-/versions
-----------

Shows the version of Datasette, Python and SQLite. `Versions example <https://latest.datasette.io/-/versions>`_:

.. code-block:: json

    {
        "datasette": {
            "version": "0.60"
        },
        "python": {
            "full": "3.8.12 (default, Dec 21 2021, 10:45:09) \n[GCC 10.2.1 20210110]",
            "version": "3.8.12"
        },
        "sqlite": {
            "extensions": {
                "json1": null
            },
            "fts_versions": [
                "FTS5",
                "FTS4",
                "FTS3"
            ],
            "compile_options": [
                "COMPILER=gcc-6.3.0 20170516",
                "ENABLE_FTS3",
                "ENABLE_FTS4",
                "ENABLE_FTS5",
                "ENABLE_JSON1",
                "ENABLE_RTREE",
                "THREADSAFE=1"
            ],
            "version": "3.37.0"
        }
    }

.. _JsonDataView_plugins:

/-/plugins
----------

Shows a list of currently installed plugins and their versions. `Plugins example <https://san-francisco.datasettes.com/-/plugins>`_:

.. code-block:: json

    [
        {
            "name": "datasette_cluster_map",
            "static": true,
            "templates": false,
            "version": "0.10",
            "hooks": ["extra_css_urls", "extra_js_urls", "extra_body_script"]
        }
    ]

Add ``?all=1`` to include details of the default plugins baked into Datasette.

.. _JsonDataView_settings:

/-/settings
-----------

Shows the :ref:`settings` for this instance of Datasette. `Settings example <https://fivethirtyeight.datasettes.com/-/settings>`_:

.. code-block:: json

    {
        "default_facet_size": 30,
        "default_page_size": 100,
        "facet_suggest_time_limit_ms": 50,
        "facet_time_limit_ms": 1000,
        "max_returned_rows": 1000,
        "sql_time_limit_ms": 1000
    }

.. _JsonDataView_config:

/-/config
---------

Shows the :ref:`configuration <configuration>` for this instance of Datasette. This is generally the contents of the :ref:`datasette.yaml or datasette.json <configuration_reference>` file, which can include plugin configuration as well. `Config example <https://latest.datasette.io/-/config>`_:

.. code-block:: json

    {
        "settings": {
            "template_debug": true,
            "trace_debug": true,
            "force_https_urls": true
        }
    }

Any keys that include the one of the following substrings in their names will be returned as redacted ``***`` output, to help avoid accidentally leaking private configuration information: ``secret``, ``key``, ``password``, ``token``, ``hash``, ``dsn``.

.. _JsonDataView_databases:

/-/databases
------------

Shows currently attached databases. `Databases example <https://latest.datasette.io/-/databases>`_:

.. code-block:: json

    [
        {
            "hash": null,
            "is_memory": false,
            "is_mutable": true,
            "name": "fixtures",
            "path": "fixtures.db",
            "size": 225280
        }
    ]

.. _JsonDataView_threads:

/-/threads
----------

Shows details of threads and ``asyncio`` tasks. `Threads example <https://latest.datasette.io/-/threads>`_:

.. code-block:: json

    {
        "num_threads": 2,
        "threads": [
            {
                "daemon": false,
                "ident": 4759197120,
                "name": "MainThread"
            },
            {
                "daemon": true,
                "ident": 123145319682048,
                "name": "Thread-1"
            },
        ],
        "num_tasks": 3,
        "tasks": [
            "<Task pending coro=<RequestResponseCycle.run_asgi() running at uvicorn/protocols/http/httptools_impl.py:385> cb=[set.discard()]>",
            "<Task pending coro=<Server.serve() running at uvicorn/main.py:361> wait_for=<Future pending cb=[<TaskWakeupMethWrapper object at 0x10365c3d0>()]> cb=[run_until_complete.<locals>.<lambda>()]>",
            "<Task pending coro=<LifespanOn.main() running at uvicorn/lifespan/on.py:48> wait_for=<Future pending cb=[<TaskWakeupMethWrapper object at 0x10364f050>()]>>"
        ]
    }

.. _JsonDataView_actor:

/-/actor
--------

Shows the currently authenticated actor. Useful for debugging Datasette authentication plugins.

.. code-block:: json

    {
        "actor": {
            "id": 1,
            "username": "some-user"
        }
    }


.. _MessagesDebugView:

/-/messages
-----------

The debug tool at ``/-/messages`` can be used to set flash messages to try out that feature. See :ref:`datasette_add_message` for details of this feature.