Preflight · Guides
n8n testing guides
How to change n8n workflows without breaking them for the people who depend on them: testing an edit before it goes live, upgrading n8n safely, and catching the failures that never throw an error. Each guide is written to be useful whether or not you use Preflight.
Before you deploy
- How to test n8n workflow changes before production
Every way to test an edit before it goes live, from pinned data to replay, and what each one misses.
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- n8n succeeded but wrong output
Why a run can report success while producing the wrong data, and how to catch it before a client does.
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Before you upgrade
- Test your workflows before upgrading to n8n 3.0
What the Migration Report catches, what it cannot, and how to check your own workflows on 3.0 safely.
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Sub-workflows
- When a sub-workflow change breaks its callers
Why a parent's diff stays clean when a sub-workflow changes, and how to find and test every caller.
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Comparisons
- n8n definition diffs vs behavior testing
What version history and Git diffs show, and what a clean definition diff still misses.
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