Generate n8n expression guidance for JavaScript-based {{...}} logic and node references.
npx skills add https://github.com/n8n-io/skills --skill n8n-expressions
Please help me install this Agent Skill. Skill: n8n-expressions Source: https://github.com/n8n-io/skills/tree/main/skills/n8n-expressions Command: npx skills add https://github.com/n8n-io/skills --skill n8n-expressions
n8n expression errors and brittle data references waste time by producing wrong or non-deterministic results when workflows branch, refactor, or clear item context.
Ask for expressions that reference upstream nodes by name, use Luxon for date operations, and avoid $json in branched workflows so the result remains correct after refactors.
High-intent search queries and answers about installing and using this skill.
To write stable n8n expressions, use node-name references like $('Node Name').item.json.field instead of $json. This ensures cross-node value access remains correct when workflows branch, refactor, or clear item context.
The best way to handle date math in n8n workflows is using Luxon operations inside your expressions. Inline Luxon date logic directly in consumer nodes to avoid adding extra processing nodes and maintain workflow reliability.
Your n8n expression returns a string because fields requiring structured types need proper typing. Use the ={{ ... }} syntax to ensure objects, arrays, booleans, and numbers aren't accidentally treated as strings.
To aggregate data with $source.all().map/filter/reduce in n8n expressions, use executeOnce appropriately. This ensures correct iteration behavior and prevents non-deterministic results when leveraging $input.all() or $('Node').all() aggregations.
You should avoid using $json in branched n8n workflows or before context-clearing nodes. Relying on $json produces brittle data references; use $('Node Name').item.json instead to keep data access stable across branching.
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