n8n Workflow Stops at a Node: How to Find and Fix the Failed Step
When an n8n workflow stops at a node, the trigger fired and the early nodes ran but a specific node failed. The break is between a successful node and the next one. Trace the input to the failed node and the expected output to find what went wrong, because the node tells you exactly what it needed and did not get.
Table of Contents
- 01.The node execution flow you are debugging
- 02.What to check first
- 03.Read the node error
- 04.Input data and required fields
- 05.Data type mismatches
- 06.Credentials and API responses
- 07.Expression errors
- 08.How to test it
The node execution flow you are debugging
An n8n workflow runs a sequence of nodes. If it stops at a node, the previous node succeeded but the failed node could not complete. The flow is the previous node producing input, the failed node processing it, the expected output and the next node. The failure is in what the failed node received or how it processed it. Read the node error and the input data to find the cause.
| Cause | What happens | How to check |
|---|---|---|
| Missing input data | Required field empty | Check input items |
| Wrong data type | Value type mismatch | Check field types |
| Credentials | Auth failed or expired | Check credential setup |
| Expression error | Expression evaluates wrong | Check the expression |
| API response | API returns an error | Check the response |
What to check first
- Open the execution history for the failed run.
- Identify the failed node and read its error message.
- Check the input items going into the failed node.
- Check the expected output of the failed node.
- Check whether required fields are present in the input.
Read the node error
The failed node reports an error message. Read it. The message usually names the problem, whether it is a missing field, a wrong type, a credential failure or an API error. The error message is the fastest way to narrow down the cause. Without reading it you are guessing, and most node failures are clearly described in the error.
Input data and required fields
A node fails when a required field is missing from the input. Check the input items going into the failed node. If a required field is empty or absent, the node cannot complete. The previous node may not have produced it, or the data may not have contained it. Trace the field back to where it should have been created and find why it is missing.
Data type mismatches
A node expects a specific data type. A text value where a number is expected or an object where a string is expected causes a failure. Check the field types in the input against what the node expects. Data type mismatches are a common cause of node failures, and the same problem appears in the n8n data mapping guide.
Credentials and API responses
A node that calls an API can fail on credentials or on the API response. Check the credential setup on the node. An expired or wrong credential causes an auth failure. If the credentials are fine, check the API response. A 4xx or 5xx response from the API causes the node to fail. API response problems are covered in the n8n API request failing guide.
Expression errors
An expression that evaluates against missing or wrong data produces an unexpected value, which can cause the node to fail. Check the expression on the failed node. An expression that references a field that does not exist in the input returns nothing or an error. Confirm the expression references fields that are actually present in the input items.
How to test it
- 1.Open the execution history for the failed run.
- 2.Read the error message on the failed node.
- 3.Check the input items going into the failed node.
- 4.Confirm required fields are present and the right type.
- 5.Check credentials if the node calls an API.
- 6.Check expressions if the node uses them.
Frequently Asked Questions
Why does my n8n workflow stop at a specific node?
The node received input it could not process. A required field may be missing, a data type may be wrong, credentials may have expired or an expression may evaluate incorrectly. Read the node error message and check the input items.
How do I find why an n8n node failed?
Open the execution history, read the error message on the failed node and check the input items going into it. Confirm required fields are present and the right type, then check credentials and expressions if relevant.
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Related Guides
n8n Data Mapping Problems: Why the Next Node Receives the Wrong Values
The source data is correct but the next node receives the wrong values. Find where a correct source value becomes an incorrect value passed to the next node.
n8n API Request Failing: How to Troubleshoot Authentication, Headers and Request Data
An API request fails when the endpoint, method, auth, headers or body does not match what the API expects. Read the status code and compare with the current documentation.
n8n Workflow Not Triggering: What to Check First
A workflow that works manually but not in production is almost always not activated. Confirm the active toggle, then check the trigger node type and credentials.