Overview

There are two places in n8n where you need to use code:

• In expressions, for example programmatically setting the value of a field based on incoming data.
• In the function node, when you need to add JavaScript to your workflow.

This section covers:

• Expressions:
  • Introduction to expressions in n8n.
  • Built in methods and variables.
  • Supported libraries: Luxon (for data and time) and JMESPath (for working with JSON).
• JavaScript:
  • Introduction to JavaScript in n8n.
  • Built in methods and variables.
  • Checking incoming data.
  • Get the number of items returned by the last node.