'require' keyword doesn't work within Node Red Function node

The first line in a Node red Function Node is

var moment = require('moment-timezone');

I am trying to establish a timezone correct date/time stamp for sensor data. I get the following error when this node runs;

ReferenceError: require is not defined (line 1, col 14)

This function, by the way, has other JavaScript which always runs perfectly.

My Package.json has no errors and I have the, "moment-timezone":"0.5.3" added.

I understand from a bit or research that I need to add something to the settings.js file, however, I need some guidance on what to add so that require is recognized.


  • As this GitHub issue answer states, you cannot use require itself inside a function node, but you can add external modules to the sandbox used to run functions. You would do this setting functionGlobalContext inside your settings.js file like the following:

    functionGlobalContext: {

    The module can then be referenced by using the following code:

    var moment = global.get('tzModule');

    Check out the Node-RED documentation on global-context for full details.