WorkflowErrors

Fix your n8n error, fast

Paste the error you're seeing. Each page gives the cause in one sentence, then the fix, then why it happens — checked against n8n's source code, not forum guesses.

• Code nodeA 'json' property isn't an objectThe envelope is right but its contents aren't. n8n's object test rejects null, arrays and Dates specifically — the exact rule, read from …
• Code nodeCode doesn't return items properlyThe Code node's return value failed a shape check before n8n ever looked at your data. The exact conditions that trigger it, read from n8…
• Self-hosting & infrastructureCredentials could not be decrypted. The likely reason is that a different "encryptionKe…Your database survived and your encryption key didn't. Why setting N8N_ENCRYPTION_KEY usually doesn't fix it, and what is and isn't recov…
• Code nodeInvalid output formatYou put one of n8n's five reserved item keys alongside your own keys on the same object. Which five, why the mix is refused, and the exac…
• AI Agent & LangChainModel output doesn't fit required formatThree different failures share this one message. How to tell them apart, and the fix for each — read from n8n's Structured Output Parser …
• Parameters & expressionsPaired item data for item from node is unavailable. Ensure node is providing the requir…An expression used .item, and a node in the chain didn't attach pairedItem to its output. The three-line fix, and the four other messages…
• WebhooksThe requested webhook "POST /webhook/[id]" is not registered.The hint underneath the message tells you whether n8n thinks you called the test URL or the production URL — and that single word decides…
• Code nodeUnknown top-level item keyThis one means your returned array is inconsistent — some items are n8n items and this one isn't. Why it fires only in Run Once for All I…

No match yet. Browse all 8 errors by category →

Browse all 8 errors by category →