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SIGNL4 n8n integrationAutomate SIGNL4 with n8n.

An alert that reaches a phone beats an email read the next morning. The SIGNL4 n8n integration holds one resource, Alert, and 2 operations: raise a Signl, then close it. There is no SIGNL4 trigger node, so the workflow starts somewhere else. Built for teams that run an on-call rotation.

Try the SIGNL4 integration on n8nSee the 2 operations

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Why automate

What does the SIGNL4 n8n integration actually do?

The SIGNL4 node turns any n8n workflow into an alerting path. It exposes a single resource, Alert, with 2 operations: send an alert, and resolve one that already went out. Authentication rests on one credential, a set of connection details saved inside n8n, built on a webhook secret. There is no SIGNL4 trigger node, so n8n pushes to SIGNL4 and never listens to it.

First scenario, watching a job that must not fail silently. A workflow reads a file or an API response on a fixed interval, compares it with what it expects, and calls alert.send when the gap is too wide. The same run can file the incident in Google Sheets for the weekly review.

Second scenario, escalation after silence. The first notice goes to a team channel through Slack. If nobody reacts before the next scheduled run, the workflow raises a Signl with Alerting Scenario set to multi_ack, so the alert has to be confirmed by everyone on duty at the moment it is raised, not by whoever taps it first.

Third scenario, closing the loop. When the condition clears, the workflow calls alert.resolve with the same External ID it used on the way in. That identifier is the only link between an alert and its resolution, and without it SIGNL4 has nothing to match.

When to reach for HTTP Request instead: the node sends and resolves, and that is the whole list. Anything outside those 2 operations goes through the HTTP Request node, which calls any endpoint of the SIGNL4 API and reuses the same credential through predefined authentication.

The limits, stated plainly. With no SIGNL4 trigger node, a workflow about SIGNL4 starts with a Schedule Trigger on a fixed interval, with the n8n Webhook node called by a third-party service, or with another tool's trigger, Telegram for instance. If the platform choice is still open, the n8n review compares hosting and cost, and the n8n training walks through building workflows like these.

Connect

How do you connect SIGNL4 to n8n?

  1. 01

    Create the SIGNL4 account

    Everything starts with a SIGNL4 account. When signup finishes, SIGNL4 sends the email titled "Sign up complete". Keep it: it carries your team's inbound webhook URL, the address outside services call to raise an alert. The credential you are about to create in n8n is built entirely from that address, and nothing gets downloaded or installed.

  2. 02

    Read the Team Secret off the URL

    The n8n credential asks for one value, Team Secret. It is the last segment of the inbound webhook URL, not the whole address. If the URL in the email is https://connect.signl4.com/webhook/helloworld, then the team secret is helloworld. Copy that fragment on its own, without the domain and without the slash in front of it.

  3. 03

    Save the credential once, reuse it everywhere

    In n8n, open the Credentials menu, create a SIGNL4 credential, paste the Team Secret, and save. A credential is created once and then shows up in the dropdown of every node that needs it, on n8n Cloud exactly as on a self-hosted instance. The next workflows never see the secret again.

Actions

What can the SIGNL4 node do?

The SIGNL4 node exposes 2 operations across 1 resources. For each one: the node as you configure it in n8n, the required fields, and our field notes.

Resources × operations matrix
ResourceResolveSend
Alert✓✓

Alert

2 operations
01

Send an alert

alert.send

What you see in n8n

Notes & use cases

Raises a Signl in SIGNL4 and pushes it to the people on duty. No field is required, so the node runs even with an empty form. Wording still matters.

Key parameters

  • Message: the detailed description of the alert, usually taken from the incoming item with an expression such as {{ $json.field }}.
  • Title: the subject of the alert, inside Additional Fields, the collection of 7 optional settings.
  • Alerting Scenario: single_ack when one confirmation is enough, multi_ack when everyone on duty has to confirm.
  • Service: files the alert under the service or system category carrying that name.
Use cases
a nightly export that fails raises a Signl holding the error text, with Service pointing at the job that broke.
02

Resolve an alert

alert.resolve

What you see in n8n

Notes & use cases

Closes an alert already open in SIGNL4, so the rotation stops being chased about something that is handled. It is the counterpart of sending, and it carries a single parameter.

Key parameters

  • External ID: the unique identifier of the record, in the third-party system, that produced the alert. It has to repeat the exact value passed when sending, otherwise SIGNL4 cannot pair the two. SIGNL4 also communicates that identifier in its outbound webhook notifications.
Use cases
a monitoring loop that sees free disk space climb back above its threshold closes the matching Signl on its own.
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FAQ

SIGNL4 and n8n, the questions that come next

01Is the SIGNL4 n8n integration free?
Yes on the n8n side. The SIGNL4 node ships with n8n, so there is nothing to install and no extra n8n cost, whether the workflow runs on n8n Cloud or on a self-hosted instance under the Community Edition and its Sustainable Use license. A workflow behaves the same in both places. What a SIGNL4 subscription itself costs is not covered here, because it is not part of the catalog data this page is built from. Budget the tool separately and treat the node as a free connector between the two, with no marketplace step and no paid add-on to enable first.
02What credentials does the SIGNL4 node need?
One credential, built on a webhook secret. SIGNL4 supports a single authentication method here and asks for one value, the Team Secret. That secret is the last part of your inbound webhook URL, and SIGNL4 sends it in the sign up complete email. If the URL ends with helloworld, then helloworld is the team secret. Because there is only one supported method, there is no API key to rotate and no OAuth app to register. Create the credential once from the Credentials menu, then every SIGNL4 node in every workflow picks it from a dropdown instead of holding its own copy.
03What are the limits of the SIGNL4 node in n8n?
It does two things. The node covers one resource, Alert, with 2 operations, send and resolve, and nothing beyond that. Anything else you want from SIGNL4 goes through the HTTP Request node, which calls any endpoint of the SIGNL4 API and reuses the same credential through predefined authentication. There is no reading either: n8n pushes alerts out and never pulls a list back, so this node has no Return All switch and no pagination to think about. Resolving depends on the External ID used when sending, so decide on that identifier before the first alert leaves the workflow.
04How do you trigger a SIGNL4 workflow in n8n?
With another trigger, because SIGNL4 has no trigger node in n8n. Three routes work. A Schedule Trigger runs the workflow on a fixed interval, which suits monitoring loops that check something and alert when the check fails. The n8n Webhook node gives you a URL that a third-party service calls, so the alert goes out as soon as that service posts to it. Or another tool's own trigger starts the run and the SIGNL4 node sits at the end of the chain. Nothing inside SIGNL4 can start an n8n workflow, so what happens in the SIGNL4 app stays there.
05n8n or Make for SIGNL4?
It depends on hosting and on the cost model. n8n runs on your own server through Docker or npm, or on n8n Cloud, and the workflow is identical in both cases. Make is hosted only, with no self-hosting option, and it bills per operation. If alerting volume is spiky, a monitoring loop firing a lot of runs during a quiet week, the per-operation model is the first thing to price out. If the payload of your alerts is data you would rather keep on your own infrastructure, self-hosting settles the question. Both build visually, so the editor itself rarely decides.
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