JavaScript Node#

This node can execute JavaScript code in a flow. It can read from the payload and insert values into the outgoing payload. It can also load JavaScript libraries for additional functionality.


  • Code, required: The JavaScript code to run.

  • Libraries: Loads optional JavaScript libraries. This is a key-value configuration block in which the key is the name of the library (for organizational purposes only) and the value is the contents of the library.

  • Outputs: a list of variables to be output from the script (see below).


The JavaScript node can modify any value in the incoming payload. It can also create new items in the outgoing payload, but those new items must be listed in the Outputs config field.

Variables in the payload are accessed in JavaScript code with the prefix payload, e.g. payload.flow.Scheduled to get the scheduled execution time of the flow.


This example fetches a JavaScript library from a web server, then uses that library to format a timestamp.

The HTTP node is configured to fetch The JavaScript node then uses response (the body of the HTTP response, containing the JS library) as input to its libraries config option. It sets up an output named timestamp. The code (below) then formats the current time and puts the result into the payload:

payload.timestamp=moment().format('MMMM Do YYYY, h:mm:ss a');