TriggerSlackReal-timeUpdated June 2026

How do I trigger when someone joins a Slack channel?

Short answer: Drop the "Slack → Member Joined Channel" trigger on your workflow canvas, add filters if you want them, and publish. It fires within seconds of the event in Slack, not on a polling schedule.

Use this trigger All 13 Slack triggers

Anatomy

What this trigger looks like in a workflow.

Drop it on the canvas. Configure a couple of fields. Publish.

In the builder

Trigger

Member Joined Channel

When the matching event happens

when a member joins a slack channelnew member joined channelon member joined channelwhen member joined channelwatch for member joined channel

What this trigger returns

for the curious

You don’t need to read this. Tiny Command auto-maps every field into the visual picker so downstream nodes can pull values by clicking. We show it here for power users who want to know what’s on the wire.

{
  "raw": {
    "type": "event_callback",
    "event": {
      "team": "T0123GHI",
      "type": "member_joined_channel",
      "user": "U0123DEF",
      "channel": "C0123ABC",
      "inviter": "U0456JKL",
      "channel_type": "C"
    },
    "token": "verification_token",
    "team_id": "T1234567890",
    "event_id": "Ev1234567890",
    "api_app_id": "A1234567890",
    "event_time": 1712835600
  },
  "user": "U0123DEF",
  "channel": "C0123ABC",
  "inviter": "U0456JKL"
}

Output shape

Fields available to downstream nodes.

Every field below can be referenced by name in any action or filter that comes after this trigger.

Field	Type	Example
raw	object	{ … }
raw.type	string	"event_callback"
raw.event	object	{ … }
raw.event.team	string	"T0123GHI"
raw.event.type	string	"member_joined_channel"
raw.event.user	string	"U0123DEF"
raw.event.channel	string	"C0123ABC"
raw.event.inviter	string	"U0456JKL"
raw.event.channel_type	string	"C"
user	string	"U0123DEF"
channel	string	"C0123ABC"
inviter	string	"U0456JKL"

Pairs with

Drop these actions after Member Joined Channel.

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Gmail · Email

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HubSpot · CRM & Sales

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Stripe · Payments

FAQ

Questions about Member Joined Channel.

How does the Member Joined Channel trigger work in Slack?

Fires when a member joins a Slack channel. Use for onboarding messages, role grants, or channel-specific welcome flows.

Is the Member Joined Channel trigger real-time?

Yes. Member Joined Channel uses webhooks or push subscriptions, not polling. Your workflow fires within seconds of the event happening in Slack.

What data does Member Joined Channel return?

The full event payload from Slack. The output shape table on this page lists every field, its type, and an example value so you can map fields into downstream nodes.

Can I filter Member Joined Channel so only some events start a workflow?

Yes. Add a Filter node right after the trigger and match on any field, whether that's subject, sender, status, or anything else in the payload. Workflows only continue when the filter passes.

Do I need Slack admin permissions to use Member Joined Channel?

For most Slack accounts a standard user can authorize the trigger. Some Slack plans require an admin to enable third-party webhooks. Check Slack's docs if the trigger fails to register.