n8n API

- The public API is unavailable during the free trial.
- Upgrade your plan to enable API access.

## Configuration

Recommended environment variables (or store in `.n8n-api-config`):

```bash
export N8N_API_BASE_URL="https://your-instance.app.n8n.cloud/api/v1"  # or http://localhost:5678/api/v1
export N8N_API_KEY="your-api-key-here"
```

Create the API key in: n8n Settings → n8n API → Create an API key.

## Auth header

All requests require this header:

```
X-N8N-API-KEY: $N8N_API_KEY
```

## Playground

The API playground is only available on self-hosted n8n and operates on real data. For safe experiments, use a test workflow or a separate test instance.

## Quick actions

### Workflows: list
```bash
curl -s -H "X-N8N-API-KEY: $N8N_API_KEY" "$N8N_API_BASE_URL/workflows" \
  | jq '.data[] | {id, name, active}'
```

### Workflows: details
```bash
curl -s -H "X-N8N-API-KEY: $N8N_API_KEY" "$N8N_API_BASE_URL/workflows/{id}"
```

### Workflows: activate or deactivate
```bash
# Activate (publish)
curl -s -X POST -H "X-N8N-API-KEY: $N8N_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"versionId":"","name":"","description":""}' \
  "$N8N_API_BASE_URL/workflows/{id}/activate"

# Deactivate
curl -s -X POST -H "X-N8N-API-KEY: $N8N_API_KEY" \
  "$N8N_API_BASE_URL/workflows/{id}/deactivate"
```

### Webhook trigger
```bash
# Production webhook
curl -s -X POST "$N8N_API_BASE_URL/../webhook/{webhook-path}" \
  -H "Content-Type: application/json" \
  -d '{"key":"value"}'

# Test webhook
curl -s -X POST "$N8N_API_BASE_URL/../webhook-test/{webhook-path}" \
  -H "Content-Type: application/json" \
  -d '{"key":"value"}'
```

### Executions: list
```bash
# Recent executions
curl -s -H "X-N8N-API-KEY: $N8N_API_KEY" \
  "$N8N_API_BASE_URL/executions?limit=10" \
  | jq '.data[] | {id, workflowId, status, startedAt}'

# Failed only
curl -s -H "X-N8N-API-KEY: $N8N_API_KEY" \
  "$N8N_API_BASE_URL/executions?status=error&limit=5"
```

### Executions: retry
```bash
curl -s -X POST -H "X-N8N-API-KEY: $N8N_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"loadWorkflow":true}' \
  "$N8N_API_BASE_URL/executions/{id}/retry"
```

## Common flows

### Health check summary
Count active workflows and recent failures:
```bash
ACTIVE=$(curl -s -H "X-N8N-API-KEY: $N8N_API_KEY" \
  "$N8N_API_BASE_URL/workflows?active=true" | jq '.data | length')

FAILED=$(curl -s -H "X-N8N-API-KEY: $N8N_API_KEY" \
  "$N8N_API_BASE_URL/executions?status=error&limit=100" \
  | jq '[.data[] | select(.startedAt > (now - 86400 | todate))] | length')

echo "Active workflows: $ACTIVE | Failed (24h): $FAILED"
```

### Debug a failed run
1. List failed executions to get the execution ID.
2. Fetch execution details and identify the failing node.
3. Review node parameters and input data.
4. Suggest a fix based on the error message.

## Endpoint index

See `assets/n8n-api.endpoints.md` for the full list of endpoints.

## REST basics (optional)
If you want a refresher, these are commonly recommended:
- KnowledgeOwl: working with APIs (intro)
- IBM Cloud Learn Hub: what is an API / REST API
- MDN: overview of HTTP

## Notes and tips
- The n8n API node can call the public API from inside workflows.
- Webhook URLs are not the same as API URLs and do not use the API key header.
- Execution records may be pruned based on instance retention settings.