There is currently support for the following device types within Home Assistant:


The file platform allows you to store notifications from Home Assistant as a file.

To enable file notifications in your installation, add the following to your configuration.yaml file:

# Example configuration.yaml entry
    platform: file
    filename: FILENAME

Configuration Variables

name string (Optional, default: notify)

Setting the optional parameter name allows multiple notifiers to be created. The notifier will bind to the service notify.NOTIFIER_NAME.

filename string Required

Name of the file to use. The file will be created if it doesn’t exist. Add the path of your configuration folder (e.g., /config) to save the file there.

timestamp boolean (Optional, default: false)

Setting timestamp to true adds a timestamp to every entry.

To use notifications, please see the getting started with automation page.


The file sensor platform reads the entries from a plain-text file and shows the found value. Only the last line of the file is used. This is similar to do $ tail -n 1 sensor.txt on the command-line. Note that file paths must be added to allowlist_external_dirs.

To enable the file sensor, add the following lines to your configuration.yaml:

# Example configuration.yaml entry
  - platform: file
    file_path: /home/user/.homeassistant/sensor-data.txt

Configuration Variables

file_path string Required

Path to file that stores the sensor data.

name string (Optional, default: file name)

Name of the sensor to use in the frontend.

unit_of_measurement string (Optional)

Defines the units of measurement of the sensor, if any.

value_template template (Optional)

Defines a template to extract a value from the payload.


In this section you find some real-life examples of how to use this sensor.

Entries as JSON

Assuming that the log file contains multiple values formatted as JSON like shown below:

{"temperature": 21, "humidity": 39}
{"temperature": 22, "humidity": 36}

This would require the following entry in the configuration.yaml file to extract the temperature:

# Example configuration.yaml entry
  - platform: file
    name: Temperature
    file_path: /home/user/.homeassistant/sensor.json
    value_template: '{{ value_json.temperature }}'
    unit_of_measurement: "°C"