If you have ever copy-pasted the same value into a dozen nodes, you already know the pain. n8n expressions are the fix. They let you pull live data from any previous node, do math, format dates, and build strings in any field in your workflow.
This post covers everything you need to get moving: syntax, the most useful built-in variables, and real-world examples you can drop into your own workflows.
What Is an n8n Expression?
An expression is JavaScript wrapped in double curly braces.
Whenever n8n sees those braces in a field, it evaluates what is inside and uses the result.
