# InfluxDB Endpoint Properties

## `query` (string)

The InfluxDB Flux query used to read or subscribe to measurements. This property is only used for read or subscribe endpoints

Example: `"from(bucket:\"my-bucket\") |> range(start: -1h) |> filter(fn: (r) => r._measurement == \"temperature\")"`

## `interval` (integer)

The amount of milliseconds between queries. If not provided defaults to 1000 milliseconds

## `cronExpression` (string)

The Cron expression used to poll the endpoint. (For examples, see: <https://github.com/node-cron/node-cron>)

Examples: `"1,2,4,5 * * * *"`, `"1-5 * * * *"`, `"*/2 * * * *"`, `"* * * January,September Sunday"`

## `measurement` (string)

The name of the measurement on which to store data points when writing data. This property can be overriden by providing the measurement in the data of a message, but it has to be set in at least one of the two places.

Example: `"exhaust_temperature"`

## `measurementPrefix` (string)

An optional prefix for the measurement name that it is prepend to it.

Example: `"engine_"`

## `fields` (object)

An optional object made up of key value pairs. These constant fields are merged with the fields from the message.

## `tags` (object)

An optional object made up of key value pairs. These constant tags are merged with the tags from the message.