Validate expression syntax and preview results without running your workflow.
n8n expressions are JavaScript-like code snippets wrapped in {{ }} that dynamically reference data from previous nodes. They let you access input data, transform values, and create conditional logic. For example, {{ $json.email }} accesses an email field, while {{ $json.price * 1.1 }} calculates a 10% markup. Expressions are powerful but syntax errors are common.
Expression errors account for the majority of n8n workflow failures. Common issues include referencing undefined fields, syntax errors like trailing periods, and type mismatches. These errors often only appear at runtime, causing workflows to fail unexpectedly. Validating expressions before deployment saves hours of debugging.
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