n8n-docs/docs/code-examples/index.md

Code in n8n

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:

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