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n8n expression validation v1.0.0

Use this resource to validate expressions and data transformations in n8n

New

  • 426 downloads
  • 212 likes
  • 161 saves

Free

Install with the CLI

In a terminal, from the folder you want:

npx --yes palatekit@latest install n8n-expression-validation

With no option, the skill goes to ~/.agents/skills/; add --agent claude-code (or codex, cursor…) to target an agent.

First time: connect the CLI with

npx --yes palatekit@latest login

The agent checks syntax before execution, tests expressions against several contexts ($json, $node), verifies handling of missing values and flags dangerous functions. You get corrected expressions and a list of pitfalls to avoid.

Mostly picked by

Updated November 2, 2026

Card for the “n8n expression validation” skill

Details

Works in
Install guides
Generates with
Your agent's model
Licence
MIT

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What you get

  • SKILL.md : syntax, context variables and safe data access
  • evals/n8n-expression-testing.yaml : evaluation scenarios
  • schemas/output.json : output format

Good fit for

  • An n8n workflow fails on fields that are sometimes missing
  • You transform JSON data with many expressions

Not for

    Tags

    • n8n
    • expressions
    • validation
    • json

    About

    You say

    “Check that the expressions in this node handle fields missing from the JSON.”

    Card for the “n8n expression validation” skill

    Skill published by proffesor-for-testing under the MIT license, delivered in its original version.

    Show more

    How to use it

    1. Install the skill in your agent's skills folder
    2. Ask your agent to validate expressions and data transformations in n8n
    3. Review and adjust the result

    Content preview

    Files

    • evals/n8n-expression-testing.yaml13.3 KB
    • LICENSE1.1 KB
    • NOTICE-PALATEKIT.md0.5 KB
    • schemas/output.json9.8 KB
    • scripts/validate-config.json0.7 KB
    • SKILL.md11.4 KB

    Origin and licence

    Listed unmodified

    Author
    proffesor-for-testing
    Source
    github.com/proffesor-for-testing/agentic-qe/tree/b177b2315521376b83f2eed40e4994fd7581d067/assets/skills/n8n-expression-testing
    Licence
    MIT

    Notice

    « n8n-expression-testing » (proffesor-for-testing, MIT) livré dans sa version d'origine : fiche en français et en anglais par PalateKit.

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