How to throw a custom error in an n8n Code node inside a loop
Two patterns for collecting per-item errors in n8n loops without halting the workflow - including the silent colon-truncation bug in Continue mode.
Topic
How To
Tactical how-to / step-by-step / troubleshooting
Claude Code and Claude Desktop MCP config file: location and format (Windows/Mac/Linux)
Two tools, two config files. Claude Desktop reads claude_desktop_config.json; Claude Code reads ~/.claude.json -- not ~/.claude/settings.json, which many guides incorrectly recommend.
n8n Code node: how to install and use external npm packages
Allowlist and install external npm packages for the n8n Code node - including the n8n 2.x task-runner gotcha most guides skip.
How to fix n8n nested loops: the inner loop retains completed state bug
The inner Loop Over Items node skips processing after the first outer iteration because it retains its completed state. Here are the three fixes, including the Done-branch chain pattern that avoids the bug entirely.
Fix 'claude mcp add: unknown option --command' in the Claude Code CLI
No --command flag exists. Use -- to pass the command: claude mcp add myserver -- npx -y server. All options go before the server name.
Make scenario won't trigger: 7-step webhook diagnosis
Seven sequential checks to diagnose a Make scenario that won't run: covers webhooks, polling triggers, incomplete executions queue, scheduling, and timezone issues.
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.
Cursor: fix 'Waiting for extension host' hang
The 'Waiting for extension host' hang blocks Cursor's AI agent and extensions. Four fixes in order of effort: restart the host, disable extensions, wipe the state database, or update Cursor.
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.