node-red-contrib-summariser

A Node-RED node that generates summaries from arrays of data

An array of data is passed in the msg.payload in the form:

[
  {"field1": <data>},
  {"field2": <data>},
  {"field3": <data>},
  ...
]

In the node's configuration, you can define a set of rules that apply to a field within the data table. Each rule delivers its result on a separate output.

Rules available:

Sum

The Sum rule sums the numerical values in the given field across the arrays. It returns a single number in msg.payload.

Count

The Count rule counts the number of times the field occurs in the arrays. It returns a single number in msg.payload.

Mean

The Mean rule calculates the mean of the numerical values in the given field across the arrays. It returns a single number in msg.payload.

Group

The Group rule calculates the frequency that every value in the given field occurs in the array. It returns an object where the values are the key, and the frequencies a returned as the value for the given key. This can be passed directly into a split node where the keys are emitted in msg.topic ready for the node-red-dashboard chart nodes.

Join

This rule joins all of the values in the given field across the array. If given, the values are separated by string in the separator field in the configuration. It returns a string in msg.payload.

Extract

This rule returns an array of all of the values for the given field across the array. It returns an array in msg.payload.