How to fix n8n OAuth callback URL returning 401
Three causes of the n8n OAuth callback 401 and the exact fixes: WEBHOOK_URL mismatch, stale credentials after a domain change, and X (Twitter) OAuth1/OAuth2 endpoint confusion.
Topic
n8n
n8n automation platform
n8n Loop node only processes the first item: how to fix it
The Loop Over Items node only processes one batch when processing nodes aren't wired back to its input. Here's the exact fix, plus the Merge node pattern for conditional branches.
How to fix n8n webhook not firing (test URL vs production URL gotcha)
n8n has two webhook URLs: test (/webhook-test/) and production (/webhook/). Using the wrong one for your mode causes silent failures. Here is how to check which URL your integration is calling and how to fix it.
How to fix n8n webhook returning 403 instead of 401 for invalid Basic Auth
n8n returns 403 Forbidden (not 401) when Basic Auth credentials are wrong - breaking browser re-challenge flows. Three workarounds: nginx proxy, Header Auth, or the pending patch in PR #26402.
Slack user_huddle_changed event: when it fires and how to use it in n8n
user_huddle_changed fires on Slack Huddle entry and exit. Requires users:read. Here is the full payload, how it differs from user_change, and how to handle it in n8n.
How to export and import n8n workflows (JSON, CLI, and UI)
Three ways to export and import n8n workflows: UI download, CLI bulk export, and node copy-paste. Plus the credential re-linking step most guides skip.
Slack call_rejected webhook event: what it means and how to handle it in n8n
The call_rejected event fires when an invited user declines an API-created Slack call. Zero OAuth scopes required. Here is how to subscribe and handle it in an n8n Webhook workflow.
Best free n8n workflow templates to copy in 2026
9,800+ free n8n workflow templates exist across the official library, GitHub repos, and community directories. Here are the best sources and what to do after importing.
n8n MCP servers in 2026: the field is a two-horse race
Two n8n MCP servers now dominate the field: one for building workflows, one for debugging. Here is how they compare.
n8n Troubleshooting & Setup: Every Guide and Free Tool
Every AutomateLab n8n guide in one place: fixes for webhook 404, ECONNREFUSED and Google Sheets quota errors, self-hosting and queue-mode setup, plus free n8n tools and datasets.