Slack Chat Integration with Novu

<Note> This feature is currently in public beta, please contact us at [email protected] to enable it for your organization. </Note>

The Slack chat integration lets your application send notifications directly to your subscribers' Slack workspaces using their own Slack accounts and workspace permissions. With this integration, Novu can deliver messages to Slack channels, direct messages (DMs) to Slack users, and incoming webhooks. For incoming webhooks, Novu can use Slack's native channel picker during OAuth.

Novu handles the full lifecycle of Slack connections and message delivery. You define where notifications should be delivered, and Novu automatically routes each message to the correct Slack workspace, channel, or user.

This guide walks you through setting up Slack chat, connect workspaces, and deliver notifications to the exact Slack destinations your users expect it.

<CardGroup cols={2}> <Card title="Send notifications" icon="send" href="#send-notifications"> Trigger a workflow to deliver a message to a subscriber's Slack channel, DM, or webhook. </Card> <Card title="Format with Block Kit" icon="layout-template" href="#format-messages-with-block-kit"> Send rich Slack messages with sections, buttons, and context blocks using trigger overrides or Framework. </Card> </CardGroup> <Note> The Chat step in the dashboard sends plain text by default. To send [Slack Block Kit](https://api.slack.com/block-kit) messages from a dashboard workflow, pass `blocks` in [trigger overrides](/platform/integrations/trigger-overrides) when you call the API. See [Format messages with Block Kit](#format-messages-with-block-kit) for examples, including `_passthrough` for raw Slack API fields. </Note> <Note> Check out the [agents](/agents) documentation for more information on how to build agents using Slack. </Note>

Configure a Slack app

Before integrating Slack chat with Novu, you must create and configure a Slack app. The Slack app manages the OAuth permissions, bot token scopes, and redirect URLs needed for Novu to connect to your users' workspaces securely.

Create a Slack app

First, you need to create a Slack app. This provides you with the credential you need to create a Slack integration in Novu.

<Steps> <Step title="Open the Slack API dashboard"> Sign in at the [Slack API dashboard](https://api.slack.com/apps). </Step> <Step title="Create an app"> In Slack, click **Create an App** to start a new app registration. </Step> <Step title="Select From scratch"> Choose **From scratch** and enter an app name and workspace. </Step> <Step title="Enter app name and workspace"> Enter an app name of your choice in the **App Name** field. Pick a Slack workspace to develop your app in.  </Step> <Step title="Create the app"> Click **Create App**. You'll be directed to the **Basic Application** for the Slack app which contains the credentials you need for configuring Slack chat inside Novu: - App ID - Client ID - Client Secret  </Step> </Steps>

Configure scopes (Permissions)

Your app needs permission to perform actions like sending messages or reading channel lists.

<Steps> <Step title="Open OAuth & Permissions"> In the sidebar, select **OAuth & Permissions**. </Step> <Step title="Open Scopes"> Scroll down to the **Scopes** section. </Step> <Step title="Add an OAuth Scope"> Under Bot Token Scopes, click **Add an OAuth Scope**.  </Step> <Step title="Add recommended scopes"> - `chat:write` - `chat:write.public` - `channels:read` - `groups:read` - `users:read` - `users:read.email` - (optional) `incoming-webhook` if you want Slack's built-in channel picker. </Step> </Steps>

These scopes are required for Novu to send messages, read channels and read users (for DMs and pickers). If you remove some of them, then certain features like channel or user selection might not work.

Set the redirect URL

This tells Slack where to send the user after they successfully authorize your app.

<Steps> <Step title="Open OAuth & Permissions"> In the sidebar, select **OAuth & Permissions**. </Step> <Step title="Open Redirect URLs"> Scroll down to the **Redirect URLs** section. </Step> <Step title="Add a redirect URL">  </Step> <Step title="Paste the Novu callback URL"> Paste the Novu OAuth callback URL. Add the redirect URL that matches your Novu region: <CodeGroup> ```bash title="US region" https://api.novu.co/v1/integrations/chat/oauth/callback ``` ```bash title="EU region" https://api.eu.novu.co/v1/integrations/chat/oauth/callback ``` </CodeGroup> </Step> <Step title="Save the URLs"> </Step> </Steps>

Configure Slack integration in Novu

Once your Slack app is set up, the next step is to configure the Slack Chat integration inside Novu.

<Steps> <Step title="Log in to the Novu dashboard"> Open the [Novu Dashboard](https://dashboard.novu.co). </Step> <Step title="Open Integrations Store"> In the sidebar, click **Integrations Store**. </Step> <Step title="Connect a provider"> In the **Integration Store**, click **Connect provider** to begin setup. </Step> <Step title="Select Slack"> </Step> <Step title="Fill in credentials"> Fill in the required fields using the credentials from your Slack app: - **Application Id**: Paste your Slack app App ID. - **Client ID**: Paste your Slack App Client ID. - **Client Secret**: Paste your Slack App Client Secret. - **Redirect URL (Optional)**: Enter the URL where you want users to be redirected to after they successfully connect their workspace. If there is no redirect URL, then Novu closes the tab immediately after the OAuth flow completes.  </Step> <Step title="Create the integration"> Click **Create Integration** to create the Slack integration. Once saved, Novu is able to: - Generate OAuth (Connect Slack) URLs for your users - Receive Slack's OAuth callback. - Store workspace tokens as connections. </Step> </Steps>

You are now ready to implement the frontend flow to let users connect their workspaces.

Let users connect their Slack workspace

To send messages to Slack, your users must first authorize Novu to access one of their Slack workspaces. This authorization happens through Slack's OAuth flow, which Novu generates and manages for you.

Generate the OAuth URL

When a user clicks Connect Slack in your application, your backend should request a unique authorization URL from Novu.

This URL is specific to the Subscriber or the Context (Tenant) it will be generated for.

<Warning> The generated OAuth URL is valid for only <strong>5 minutes</strong>. Do not cache this URL; generate it dynamically when the user initiates the flow. </Warning> <Tabs> <Tab title="Node.js"> ```typescript import { Novu } from '@novu/api';

const novu = new Novu({ secretKey: "<NOVU_SECRET_KEY>" });

const response = await novu.integrations.generateChatOAuthUrl({ integrationIdentifier: 'slack', subscriberId: 'subscriberId', context: { "tenant": "orgId" }, });

</Tab> <Tab title="Go"> ```go import ( "context" "os"

)

s := novugo.New(novugo.WithSecurity(os.Getenv("NOVU_SECRET_KEY")))

res, err := s.Integrations.GenerateChatOAuthURL(context.Background(), components.GenerateChatOauthURLRequestDto{ IntegrationIdentifier: "slack", SubscriberID: novugo.String("subscriberId"), }, nil)

</Tab> <Tab title=".NET"> ```csharp using Novu; using Novu.Models.Components;

var sdk = new NovuSDK(secretKey: "<NOVU_SECRET_KEY>"); var response = await sdk.Integrations.GenerateChatOAuthUrlAsync( generateChatOauthUrlRequestDto: new GenerateChatOauthUrlRequestDto() { IntegrationIdentifier = "slack", SubscriberId = "subscriberId", });

</Tab> <Tab title="cURL"> ```bash curl -L -X POST 'https://api.novu.co/v1/integrations/chat/oauth' \ -H 'Content-Type: application/json' \ -H 'Authorization: ApiKey <NOVU_SECRET_KEY>' \ -d '{ "integrationIdentifier": "slack", "subscriberId": "subscriberId", "context": { "tenant": "orgId" } }' ``` </Tab> </Tabs>

Your application can support multiple Slack workspace connections per user or per tenant by triggering separate OAuth flows.

Novu allows one connection per (integration + subscriber + context). To connect multiple workspaces, provide different combinations of subscriber or context.

Redirect the user

Once your backend returns the oauthUrl, open it in a new tab or window.

Slack then guides the user through:

<Steps> <Step title="Review permissions"> Reviewing your app's requested permissions </Step> <Step title="Approve authorization"> Approving the authorization </Step> <Step title="Redirect to Novu"> Redirecting back to Novu's callback URL </Step> </Steps>

After the user approves access, Novu handles the rest of the OAuth flow automatically.

<Steps> <Step title="Novu exchanges the code"> Novu stores the Slack access token for the connected workspace. </Step> <Step title="Novu creates a connection"> Novu creates a Slack connection for that workspace, it is referenced by `connectionIdentifier` when creating endpoints.You can also provider a custom `connectionIdentifier` to the `generateChatOAuthUrl()` and then connection with such identifier will be created instead of randomly generated one. </Step> </Steps> <Note> **Alternative: handle OAuth yourself.** Instead of `generateChatOAuthUrl()`, you can run the Slack OAuth flow with your own app, use the access token with Slack's APIs directly, then register the workspace with Novu via [`channelConnections.create`](/api-reference/channel-connections/create-a-channel-connection) (or `POST /v1/channel-connections`):

Provide at least one of subscriberId or context — same as the Novu-managed OAuth flow. </Note>

Choose delivery destinations

After a workspace is connected, you or users decide where in Slack to send the messages. This can either be a Slack channel, to a user or an incoming webhook URLs. After the delivery location has been selected, a Slack endpoint is then created for that location.

<Tabs> <Tab title="Slack channel">

This is the typical flow for sending notifications to public or private channels.

<Steps> <Step title="Get the channel ID"> ```bash curl -X GET "https://slack.com/api/conversations.list" \ -H "Authorization: Bearer <YOUR_BOT_TOKEN>" ```

To learn more about using Slack conversations API to either get public or private channels, refer Slack documentation. </Step>

<Step title="Create the endpoint"> <Tabs> <Tab title="Node.js"> ```typescript import { Novu } from '@novu/api';

const novu = new Novu({ secretKey: "<NOVU_SECRET_KEY>" });

await novu.channelEndpoints.create({ subscriberId: 'user-123', integrationIdentifier: 'slack', connectionIdentifier: 'conn_slack_acme', context: { tenant: 'acme' }, type: 'slack_channel', endpoint: { channelId: 'C012345' }, });

</Tab> <Tab title="Go"> ```go import ( "context" "os"

)

s := novugo.New(novugo.WithSecurity(os.Getenv("NOVU_SECRET_KEY")))

res, err := s.ChannelEndpoints.Create(context.Background(), operations.CreateChannelEndpointsControllerCreateChannelEndpointRequestBodySlackChannel( components.CreateSlackChannelEndpointDto{ SubscriberID: "user-123", IntegrationIdentifier: "slack", ConnectionIdentifier: novugo.String("conn_slack_acme"), Type: components.CreateSlackChannelEndpointDtoTypeSlackChannel, Endpoint: components.SlackChannelEndpointDto{ChannelID: "C012345"}, }, ), nil)

</Tab> <Tab title=".NET"> ```csharp using Novu; using Novu.Models.Components;

var sdk = new NovuSDK(secretKey: "<NOVU_SECRET_KEY>"); await sdk.ChannelEndpoints.CreateAsync( requestBody: CreateSlackChannelEndpointDto.CreateSlackChannel( new CreateSlackChannelEndpointDto() { SubscriberId = "user-123", IntegrationIdentifier = "slack", ConnectionIdentifier = "conn_slack_acme", Type = CreateSlackChannelEndpointDtoType.SlackChannel, Endpoint = new SlackChannelEndpointDto() { ChannelId = "C012345" }, }));

</Tab> <Tab title="cURL"> ```bash curl -L -X POST 'https://api.novu.co/v1/channel-endpoints' \ -H 'Content-Type: application/json' \ -H 'Authorization: ApiKey <NOVU_SECRET_KEY>' \ -d '{ "subscriberId": "user-123", "integrationIdentifier": "slack", "connectionIdentifier": "conn_slack_acme", "context": { "tenant": "acme" }, "type": "slack_channel", "endpoint": { "channelId": "C012345" } }' ``` </Tab> </Tabs> </Step> </Steps> </Tab> <Tab title="Slack user">

Use this to send personal messages and notifications directly to a specific user.

<Steps> <Step title="Get the Slack user ID"> ```bash curl -X GET "https://slack.com/api/users.list" \ -H "Authorization: Bearer <YOUR_BOT_TOKEN>" ```

For example, you can look up a Slack user ID by their email address, if you requested the users:read.email scope.

To learn more about using Slack users.list method, refer Slack documentation. </Step>

<Step title="Create the endpoint"> <Tabs> <Tab title="Node.js"> ```typescript import { Novu } from '@novu/api';

const novu = new Novu({ secretKey: "<NOVU_SECRET_KEY>" });

await novu.channelEndpoints.create({ type: 'slack_user', subscriberId: 'user-123', integrationIdentifier: 'slack', connectionIdentifier: 'conn_slack_acme', context: { tenant: 'acme' }, endpoint: { userId: 'U01234567' }, });

</Tab> <Tab title="Go"> ```go import ( "context" "os"

)

s := novugo.New(novugo.WithSecurity(os.Getenv("NOVU_SECRET_KEY")))

res, err := s.ChannelEndpoints.Create(context.Background(), operations.CreateChannelEndpointsControllerCreateChannelEndpointRequestBodySlackUser( components.CreateSlackUserEndpointDto{ SubscriberID: "user-123", IntegrationIdentifier: "slack", ConnectionIdentifier: novugo.String("conn_slack_acme"), Type: components.CreateSlackUserEndpointDtoTypeSlackUser, Endpoint: components.SlackUserEndpointDto{UserID: "U01234567"}, }, ), nil)

</Tab> <Tab title=".NET"> ```csharp using Novu; using Novu.Models.Components;

var sdk = new NovuSDK(secretKey: "<NOVU_SECRET_KEY>"); await sdk.ChannelEndpoints.CreateAsync( requestBody: CreateSlackUserEndpointDto.CreateSlackUser( new CreateSlackUserEndpointDto() { SubscriberId = "user-123", IntegrationIdentifier = "slack", ConnectionIdentifier = "conn_slack_acme", Type = CreateSlackUserEndpointDtoType.SlackUser, Endpoint = new SlackUserEndpointDto() { UserId = "U01234567" }, }));

</Tab> <Tab title="cURL"> ```bash curl -L -X POST 'https://api.novu.co/v1/channel-endpoints' \ -H 'Content-Type: application/json' \ -H 'Authorization: ApiKey <NOVU_SECRET_KEY>' \ -d '{ "type": "slack_user", "subscriberId": "user-123", "integrationIdentifier": "slack", "connectionIdentifier": "conn_slack_acme", "context": { "tenant": "acme" }, "endpoint": { "userId": "U01234567" } }' ``` </Tab> </Tabs> </Step> </Steps> </Tab> <Tab title="Incoming webhook">

If incoming-webhook scope was included when configuring the OAuth and permissions scopes in Step 1.1. Slack would show its own channel picker during the OAuth flow:

<Steps> <Step title="User selects a channel"> The subscriber picks a Slack channel where notifications should be delivered. </Step> <Step title="Slack returns webhook URL"> </Step> <Step title="Novu creates webhook endpoint"> Novu automatically creates a webhook endpoint for that subscriber using that URL. </Step> </Steps>

You don’t need to collect channelId yourself in this mode, Slack’s native channel picker handles it.

</Tab> </Tabs>

Send notifications

Once you have at least one Slack connection, and one or more Slack endpoints. You can trigger the workflow:

<Tabs> <Tab title="Node.js"> ```typescript import { Novu } from '@novu/api';

const novu = new Novu({ secretKey: "<NOVU_SECRET_KEY>" });

await novu.trigger({ workflowId: "order-shipped", to: { subscriberId: "user-123", }, payload: { "orderNumber": "ORD-12345", "trackingUrl": "https://acme.com/track/123" }, context: { "tenant": "acme" }, });

</Tab> <Tab title="Go"> ```go import ( "context" "os"

)

s := novugo.New(novugo.WithSecurity(os.Getenv("NOVU_SECRET_KEY")))

res, err := s.Trigger(context.Background(), components.TriggerEventRequestDto{ WorkflowID: "order-shipped", To: components.CreateToSubscriberPayloadDto(components.SubscriberPayloadDto{ SubscriberID: "user-123", }), Payload: map[string]any{ "orderNumber": "ORD-12345", "trackingUrl": "https://acme.com/track/123" }, Context: map[string]any{ "tenant": "acme" }, }, nil)

</Tab> <Tab title=".NET"> ```csharp using Novu; using Novu.Models.Components;

var sdk = new NovuSDK(secretKey: "<NOVU_SECRET_KEY>");

await sdk.TriggerAsync(triggerEventRequestDto: new TriggerEventRequestDto() { WorkflowId = "order-shipped", To = To.CreateSubscriberPayloadDto(new SubscriberPayloadDto() { SubscriberId = "user-123" }), Payload = { "orderNumber": "ORD-12345", "trackingUrl": "https://acme.com/track/123" }, Context = { "tenant": "acme" }, });

</Tab> <Tab title="cURL"> ```bash curl --location 'https://api.novu.co/v1/events/trigger' \ --header 'Content-Type: application/json' \ --header 'Authorization: ApiKey <NOVU_SECRET_KEY>' \ -d '{ "name": "order-shipped", "to": [ "user-123" ], "payload": { "orderNumber": "ORD-12345", "trackingUrl": "https://acme.com/track/123" }, "context": { "tenant": "acme" } }' ``` </Tab> </Tabs>

When the workflow is triggered, Novu will:

<Steps> <Step title="Find Slack endpoints"> Novu looks up Slack endpoints that match the subscriber ID and context. </Step> <Step title="Use the workspace connection"> </Step> <Step title="Deliver messages"> Novu sends the notification to each configured Slack destination. By default, the Chat step body is sent as plain text. To send Block Kit formatting, see [Format messages with Block Kit](#format-messages-with-block-kit). </Step> </Steps> <Note> **Message formatting:** The dashboard Chat step editor supports a plain text `body`. For rich Slack messages (sections, buttons, context blocks), use trigger overrides at send time or Framework provider overrides in code-first workflows. Digest summaries in the dashboard work as plain text using [digest variables](/platform/workflow/add-notification-content/personalize-content#digest-variables). </Note>

Format messages with Block Kit

The Chat step in the Novu dashboard sends a plain text message body to Slack. There is no Block Kit editor in the workflow UI today.

You still have a few ways to send richer Slack messages:

Approach	Best for
Chat step body (dashboard)	Plain text summaries, including digest variables
Trigger overrides (API)	Block Kit sections, buttons, and context blocks built from your trigger payload
Framework provider overrides	Full Block Kit control in code-first workflows, including dynamic digest formatting

Plain text and digest summaries

For digest workflows built in the dashboard, use digest variables in the Chat step body to build a text summary. For example:

This renders as plain text in Slack. It does not produce Block Kit formatting such as buttons or styled sections.

Send Block Kit with trigger overrides

To send Slack Block Kit messages from a dashboard workflow, pass blocks in the overrides object when you trigger the workflow. The Chat step body from your template is still sent as the fallback text field unless you override it.

Copy the step identifier from your workflow in the dashboard and use it under overrides.steps.

<Tabs> <Tab title="Node.js"> ```typescript import { Novu } from '@novu/api';

const novu = new Novu({ secretKey: '<NOVU_SECRET_KEY>' });

await novu.trigger({ workflowId: 'comment-alert', to: { subscriberId: 'user-123' }, payload: { postTitle: 'Q1 planning thread', postUrl: 'https://app.example.com/posts/456', }, overrides: { steps: { 'slack-chat-step': { providers: { slack: { text: 'You have new comments', blocks: [ { type: 'section', text: { type: 'mrkdwn', text: 'New comments on Q1 planning thread', }, }, { type: 'actions', elements: [ { type: 'button', text: { type: 'plain_text', text: 'View thread' }, url: 'https://app.example.com/posts/456', }, ], }, ], }, }, }, }, }, });

</Tab> <Tab title="Go"> ```go import ( "context" "os"

)

s := novugo.New(novugo.WithSecurity(os.Getenv("NOVU_SECRET_KEY")))

_, err := s.Trigger(context.Background(), components.TriggerEventRequestDto{ WorkflowID: "comment-alert", To: components.CreateToSubscriberPayloadDto(components.SubscriberPayloadDto{ SubscriberID: "user-123", }), Payload: map[string]any{ "postTitle": "Q1 planning thread", "postUrl": "https://app.example.com/posts/456", }, Overrides: map[string]map[string]any{ "steps": { "slack-chat-step": map[string]any{ "providers": map[string]any{ "slack": map[string]any{ "text": "You have new comments", "blocks": []map[string]any{ { "type": "section", "text": map[string]any{ "type": "mrkdwn", "text": "New comments on Q1 planning thread", }, }, { "type": "actions", "elements": []map[string]any{ { "type": "button", "text": map[string]any{ "type": "plain_text", "text": "View thread", }, "url": "https://app.example.com/posts/456", }, }, }, }, }, }, }, }, }, }, nil)

</Tab> <Tab title=".NET"> ```csharp using Novu; using Novu.Models.Components; using System.Collections.Generic;

var sdk = new NovuSDK(secretKey: "<NOVU_SECRET_KEY>");

await sdk.TriggerAsync(triggerEventRequestDto: new TriggerEventRequestDto() { WorkflowId = "comment-alert", To = To.CreateSubscriberPayloadDto(new SubscriberPayloadDto() { SubscriberId = "user-123" }), Payload = new Dictionary<string, object>() { { "postTitle", "Q1 planning thread" }, { "postUrl", "https://app.example.com/posts/456" }, }, Overrides = new Overrides() { Steps = new Dictionary<string, Dictionary<string, Dictionary<string, object>>>() { { "slack-chat-step", new Dictionary<string, Dictionary<string, object>>() { { "providers", new Dictionary<string, object>() { { "slack", new Dictionary<string, object>() { { "text", "You have new comments" }, { "blocks", new List<Dictionary<string, object>>() { new Dictionary<string, object>() { { "type", "section" }, { "text", new Dictionary<string, object>() { { "type", "mrkdwn" }, { "text", "New comments on Q1 planning thread" }, } }, }, new Dictionary<string, object>() { { "type", "actions" }, { "elements", new List<Dictionary<string, object>>() { new Dictionary<string, object>() { { "type", "button" }, { "text", new Dictionary<string, object>() { { "type", "plain_text" }, { "text", "View thread" }, } }, { "url", "https://app.example.com/posts/456" }, }, } }, }, } }, } }, } }, } }, }, }, });

</Tab> <Tab title="cURL"> ```bash curl -X POST 'https://api.novu.co/v1/events/trigger' \ -H 'Content-Type: application/json' \ -H 'Authorization: ApiKey <NOVU_SECRET_KEY>' \ -d '{ "name": "comment-alert", "to": { "subscriberId": "user-123" }, "payload": { "postTitle": "Q1 planning thread", "postUrl": "https://app.example.com/posts/456" }, "overrides": { "steps": { "slack-chat-step": { "providers": { "slack": { "text": "You have new comments", "blocks": [ { "type": "section", "text": { "type": "mrkdwn", "text": "*New comments on Q1 planning thread*" } }, { "type": "actions", "elements": [ { "type": "button", "text": { "type": "plain_text", "text": "View thread" }, "url": "https://app.example.com/posts/456" } ] } ] } } } } } }' ``` </Tab> </Tabs>

Replace slack-chat-step with the step identifier from your workflow. Step-level overrides take priority over workflow-level overrides.

Workflow-level overrides

If your workflow has a single Slack Chat step, you can apply Block Kit to all Slack steps in that workflow without targeting a step ID:

Send extra Slack fields with _passthrough

Use _passthrough when you need raw Slack chat.postMessage fields that are not exposed in the dashboard. Values in _passthrough.body are merged last and take priority over other override fields.

<Tabs> <Tab title="Node.js"> ```typescript await novu.trigger({ workflowId: 'comment-alert', to: { subscriberId: 'user-123' }, payload: { postTitle: 'Q1 planning thread', postUrl: 'https://app.example.com/posts/456', }, overrides: { steps: { 'slack-chat-step': { providers: { slack: { _passthrough: { body: { text: 'You have new comments', unfurl_links: false, blocks: [ { type: 'section', text: { type: 'mrkdwn', text: '*New comments on Q1 planning thread*', }, }, { type: 'context', elements: [ { type: 'mrkdwn', text: 'Sent via Novu', }, ], }, ], }, }, }, }, }, }, }, }); ``` </Tab> <Tab title="Python"> ```python novu.trigger(trigger_event_request_dto=novu_py.TriggerEventRequestDto( workflow_id='comment-alert', to={'subscriber_id': 'user-123'}, payload={ 'postTitle': 'Q1 planning thread', 'postUrl': 'https://app.example.com/posts/456', }, overrides={ 'steps': { 'slack-chat-step': { 'providers': { 'slack': { '_passthrough': { 'body': { 'text': 'You have new comments', 'unfurl_links': False, 'blocks': [ { 'type': 'section', 'text': { 'type': 'mrkdwn', 'text': '*New comments on Q1 planning thread*', }, }, { 'type': 'context', 'elements': [ { 'type': 'mrkdwn', 'text': 'Sent via Novu', }, ], }, ], }, }, }, }, }, }, }, )) ``` </Tab> <Tab title="Go"> ```go _, err := s.Trigger(context.Background(), components.TriggerEventRequestDto{ WorkflowID: "comment-alert", To: components.CreateToSubscriberPayloadDto(components.SubscriberPayloadDto{ SubscriberID: "user-123", }), Payload: map[string]any{ "postTitle": "Q1 planning thread", "postUrl": "https://app.example.com/posts/456", }, Overrides: map[string]map[string]any{ "steps": { "slack-chat-step": map[string]any{ "providers": map[string]any{ "slack": map[string]any{ "_passthrough": map[string]any{ "body": map[string]any{ "text": "You have new comments", "unfurl_links": false, "blocks": []map[string]any{ { "type": "section", "text": map[string]any{ "type": "mrkdwn", "text": "*New comments on Q1 planning thread*", }, }, }, }, }, }, }, }, }, }, }, nil) ``` </Tab> <Tab title="PHP"> ```php $sdk->trigger( triggerEventRequestDto: new Components\TriggerEventRequestDto( workflowId: 'comment-alert', to: new Components\SubscriberPayloadDto(subscriberId: 'user-123'), payload: [ 'postTitle' => 'Q1 planning thread', 'postUrl' => 'https://app.example.com/posts/456', ], overrides: [ 'steps' => [ 'slack-chat-step' => [ 'providers' => [ 'slack' => [ '_passthrough' => [ 'body' => [ 'text' => 'You have new comments', 'unfurl_links' => false, 'blocks' => [ [ 'type' => 'section', 'text' => [ 'type' => 'mrkdwn', 'text' => '*New comments on Q1 planning thread*', ], ], ], ], ], ], ], ], ], ], ), ); ``` </Tab> <Tab title=".NET"> ```csharp await sdk.TriggerAsync(triggerEventRequestDto: new TriggerEventRequestDto() { WorkflowId = "comment-alert", To = To.CreateSubscriberPayloadDto(new SubscriberPayloadDto() { SubscriberId = "user-123" }), Payload = new Dictionary<string, object>() { { "postTitle", "Q1 planning thread" }, { "postUrl", "https://app.example.com/posts/456" }, }, Overrides = new Overrides() { Steps = new Dictionary<string, Dictionary<string, Dictionary<string, object>>>() { { "slack-chat-step", new Dictionary<string, Dictionary<string, object>>() { { "providers", new Dictionary<string, object>() { { "slack", new Dictionary<string, object>() { { "_passthrough", new Dictionary<string, object>() { { "body", new Dictionary<string, object>() { { "text", "You have new comments" }, { "unfurl_links", false }, { "blocks", new List<Dictionary<string, object>>() { new Dictionary<string, object>() { { "type", "section" }, { "text", new Dictionary<string, object>() { { "type", "mrkdwn" }, { "text", "*New comments on Q1 planning thread*" }, } }, }, } }, } }, } }, } }, } }, } }, }, }, }); ``` </Tab> <Tab title="Java"> ```java novu.trigger() .body(TriggerEventRequestDto.builder() .workflowId("comment-alert") .to(To2.of(SubscriberPayloadDto.builder().subscriberId("user-123").build())) .payload(Map.of( "postTitle", "Q1 planning thread", "postUrl", "https://app.example.com/posts/456")) .overrides(TriggerEventRequestDtoOverrides.builder() .additionalProperties(Map.of( "steps", Map.of( "slack-chat-step", Map.of( "providers", Map.of( "slack", Map.of( "_passthrough", Map.of( "body", Map.of( "text", "You have new comments", "unfurl_links", false, "blocks", List.of( Map.of( "type", "section", "text", Map.of( "type", "mrkdwn", "text", "*New comments on Q1 planning thread*")))))))))) .build()) .build()) .call(); ``` </Tab> <Tab title="cURL"> ```bash curl -X POST 'https://api.novu.co/v1/events/trigger' \ -H 'Content-Type: application/json' \ -H 'Authorization: ApiKey <NOVU_SECRET_KEY>' \ -d '{ "name": "comment-alert", "to": { "subscriberId": "user-123" }, "payload": { "postTitle": "Q1 planning thread", "postUrl": "https://app.example.com/posts/456" }, "overrides": { "steps": { "slack-chat-step": { "providers": { "slack": { "_passthrough": { "body": { "text": "You have new comments", "unfurl_links": false, "blocks": [ { "type": "section", "text": { "type": "mrkdwn", "text": "*New comments on Q1 planning thread*" } }, { "type": "context", "elements": [ { "type": "mrkdwn", "text": "Sent via Novu" } ] } ] } } } } } } } }' ``` </Tab> </Tabs> <Note> For a full guide on how overrides work, including workflow-level and step-level scopes, see [Trigger overrides](/platform/integrations/trigger-overrides). </Note>

Block Kit with digest workflows

Trigger overrides are set when you call the trigger API. They work well when each trigger carries the data you need to build the message.

For digest workflows, Novu batches multiple triggers into one notification. The Chat step body can use digest variables to summarize batched events, but overrides are not re-evaluated with that aggregated data. To build Block Kit dynamically from a digest batch, use Framework provider overrides in a code-first workflow.

Using Slack with agents

Slack is a supported agent provider. Connect your Slack app to an agent so users can message in channels or DMs and get replies in the same thread, without building Slack event handling yourself.

<Card title="Build agents on Slack" icon="bot" href="/agents"> Learn how Novu agents work, including managed and custom code agents. </Card>

What you get

When Slack is connected to an agent:

• Users message your app in Slack and your agent responds in the same thread
• Conversations appear in the dashboard under Agent Conversations
• Supported content includes text, markdown, files, interactive cards, reactions, and typing indicators

See agent conversations for capabilities across all providers.

Agent conversations vs. workflow notifications

Use case	What happens
Agent conversation	The user messages your Slack app and your agent replies in the same thread.
Workflow notification	You trigger a workflow with a Chat step and Novu sends a one-way message to the subscriber's linked Slack destination.

Both can use the same Slack integration. Your agent handles back-and-forth conversations while workflows send updates such as deploy alerts to the same workspace.

Related

<CardGroup cols={2}> <Card icon="messages-square" href="/platform/integrations/trigger-overrides" title="Trigger overrides"> Pass Slack `blocks` and `_passthrough` fields when triggering a workflow from your application. </Card> <Card icon="bot" href="/agents/get-started/agents-and-providers" title="Agents and providers"> Connect Slack and other providers to an agent. </Card> </CardGroup>