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Google Pubsub to Slack integration — real-time, two-way sync

Keep Google Pubsub and Slack in sync without custom scripts. Cut weeks of integration work, eliminate silent data drift, and give your team a single, reliable source of truth.

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Adopted by fast-scaling companies moving mission-critical data in real time

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Why teams connect Google Pubsub and Slack

Connect the tickets, records, and events in Slack to the systems engineering runs in Google Pubsub, kept current in real time and in both directions.

Slack is where customer-facing and operational work happens: the tickets, conversations, contacts, and records a team touches every day. Google Pubsub is where engineering runs the systems behind that work — the issue trackers, message brokers, directories, and monitors that keep services moving. The same items, people, and events matter to both, and when the only link between them is a manual hand-off or an overnight export, each side acts on a stale copy of what the other already knows.

Stacksync syncs Threads, Users, User groups, Files in Slack with Schemas, Snapshots, Message attributes, Dead-letter topics in Google Pubsub field by field, in real time, and in both directions. You decide which system owns which fields; Stacksync maps the overlap, resolves conflicts by rules you set, and keeps every copy current, with no middleware to build and no API limits to babysit.

Common use cases

  • 01 Post CRM record changes into deal or account channels so the team sees updates without opening the CRM
  • 02 Sync the Slack user directory with the HRIS or identity provider to keep memberships and profiles current
  • 03 Fan out CRM record changes to a topic and let billing, analytics, and notification subscriptions each react without coupling to the source.
  • 04 Bridge order or billing events off a topic into an ERP or ticketing system as they arrive, mapping message attributes to target fields.

Common sync patterns

Where Google Pubsub tracks engineering work: requests become issues

A ticket or request raised in Slack opens or updates a matching issue in Google Pubsub, and status, comments, and resolution flow back, so support and engineering work the same item instead of retyping it.

Where Google Pubsub moves messages between services: activity lands on the stream

Records created or changed in Slack publish to the queue or topic in Google Pubsub as they happen, so downstream services react to real events rather than polling for them.

Where Google Pubsub is the directory or identity source: one set of users

People and accounts in Slack stay matched to the users in Google Pubsub, so access, provisioning, and org changes propagate instead of being keyed in twice.

What you can sync between Google Pubsub and Slack

Representative objects on each side — any object or custom field can map to any target. Schemas are auto-detected; types are converted between the two systems.

Google Pubsub objects Slack objects How this pairing syncs
Messages The synced unit: base64-encoded data plus attributes, ordering key, messageId and publishTime; capped at 10 MB each. Messages Keyed by channel and timestamp; posted via chat.postMessage and read via history methods. Same entity on both sides — records pair one-to-one and field-level changes reconcile in both directions.
Ordering keys Tag messages so those sharing a key deliver in publish order when message ordering is enabled; throughput capped at 1 MBps per key. Channels Conversations (public, private, DMs) that messages are read from and posted to. Ordering keys is specific to Google Pubsub and Channels to Slack — each maps to any object or custom field on the other side.
Topics Named resource publishers send to; Stacksync publishes each record change as a message to a topic for downstream subscribers to consume. Threads Replies grouped under a parent message timestamp, preserved when archiving conversations. Topics is specific to Google Pubsub and Threads to Slack — each maps to any object or custom field on the other side.
Subscriptions A stream of messages from one topic; Stacksync consumes here via StreamingPull or a push endpoint, acknowledging each message after a successful write. Users Workspace members with profile fields, synced against HR systems and identity providers. Subscriptions is specific to Google Pubsub and Users to Slack — each maps to any object or custom field on the other side.
Schemas Avro or Protocol Buffer definitions bound to a topic; validate that every published message matches the agreed structure. User groups Handles like @support that map to teams in external systems. Schemas is specific to Google Pubsub and User groups to Slack — each maps to any object or custom field on the other side.
Snapshots Captured subscription state for seek/replay; lets already-acknowledged messages be redelivered from a point in time. Files Uploads attached to messages, retrievable for archiving. Snapshots is specific to Google Pubsub and Files to Slack — each maps to any object or custom field on the other side.

How changes propagate between Google Pubsub and Slack

Each direction of the sync is driven by what the source system can signal and what the destination accepts — detection, delivery, and expected latency below.

Google Pubsub Slack Sub-second propagation

DetectionGoogle Pubsub notifies Stacksync of record changes through webhook events. Consumes messages as they arrive on a subscription — StreamingPull (long-lived gRPC) or a push subscription delivering each message as an HTTPS POST.

DeliveryEach detected change is written to Slack through its API, with automatic retries and rate-limit backoff.

Slack Google Pubsub Sub-second propagation

DetectionSlack notifies Stacksync of record changes through webhook events. Events API webhooks, delivered over HTTP callbacks or Socket Mode.

DeliveryEach detected change is written to Google Pubsub through its API, with automatic retries and rate-limit backoff.

Rate-limit considerations

  • Google Pubsub: Per-region throughput quotas (publish up to ~4 GB/s in large regions); 10 MB max per message and per publish request, 1,000 messages per request, and 1 MBps per ordering key.
  • Slack: Per-method rate limit tiers; message posting is additionally limited per channel.
What ships with Google Pubsub ⇄ Slack

Connect Google Pubsub and Slack for flexible, real-time data sync.

Real-time sync, workflow automation, event queues, EDI, and monitoring, for every Google Pubsub–Slack connection.

Real-time

Two-way sync

Changes in Google Pubsub or Slack instantly reflect in both systems. No stale data, no manual imports.

No-code + pro-code

Workflow automation

Trigger automated workflows whenever Google Pubsub or Slack data changes, update records, fire webhooks, or kick off sequences without brittle API scripts.

At scale

Event queues

Handle millions of events per minute without losing a single Google Pubsub or Slack record.

Observability

Monitoring

Track your Google Pubsub ⇄ Slack sync health, view errors, and replay failed events in one click.

Trading partners

EDI

Transform legacy EDI complexity into simple database interactions between Google Pubsub and Slack.

How the Google Pubsub and Slack connectors work

Google Pubsub

Integration surface
REST and gRPC (Cloud Pub/Sub API v1)
Authentication
Google Cloud IAM via OAuth 2.0 / service-account credentials (JSON key or workload identity); requires roles such as pubsub.publisher and pubsub.subscriber
Change detection
Consumes messages as they arrive on a subscription — StreamingPull (long-lived gRPC) or a push subscription delivering each message as an HTTPS POST; no modified-date polling
Capabilities
read · write · webhooks
Rate limits
Per-region throughput quotas (publish up to ~4 GB/s in large regions); 10 MB max per message and per publish request, 1,000 messages per request, and 1 MBps per ordering key

Slack

Integration surface
Web API (HTTP RPC-style methods) plus the Events API
Authentication
OAuth 2.0 with bot or user tokens and granular scopes
Change detection
Events API webhooks, delivered over HTTP callbacks or Socket Mode
Capabilities
read · write · webhooks
Rate limits
Per-method rate limit tiers; message posting is additionally limited per channel
How it works

How to connect Google Pubsub to Slack — three steps, no code

Configure and sync within minutes, no code. Whether you sync 50k or 100M+ records, Stacksync handles the queues, infra, and plumbing. Integrations are non-invasive and need zero setup on your systems.

  1. 01

    Connect your apps

    Authenticate Google Pubsub and Slack with each platform's native method — OAuth, API keys, or service accounts — plus secure options like SSH tunneling, IP whitelisting, and VPC peering.

    • OAuth 2.0
    • SSH tunnel
    • VPC peering
    Google Pubsub connected
    Slack connected
    OAuth 2.0
    SSH tunnel
    SSL certificate
    VPC peering
  2. 02

    Choose tables

    Pick the Google Pubsub and Slack objects to sync — Stacksync auto-detects both schemas, including custom fields where the platform exposes them. Sync to existing tables, or let Stacksync create new ones with ideal data types.

    • Standard objects
    • Custom objects
    • Auto-schema
    objects · Google Pubsub ⇄ Slack
    Customers 12,480
    Sales Orders 8,213
    Invoices 5,902
    Items 1,344
  3. 03

    Map fields

    Fields map automatically even when names and types differ. Stacksync handles transformation and type casting for you, zero configuration required.

    • Auto-map
    • Type casting
    • Transforms
    Google Pubsub Slack
    Company company_name text
    Email email text
    Amount amount numeric
    Created created_at timestamp
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FAQ

Google Pubsub and Slack integration FAQ

SECURITY

Security teams trust Stacksync

As a data company, we understand the importance of keeping your data secure. Stacksync is built with security best practices to keep your data safe at every layer, and is DPF-certified for US, EU, UK and CH data transfers.

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SSO & SCIM

Let your users access Stacksync from your centralized user management systems. Works with Okta, Azure, Google SSO and more.

Alerts

Immediately get alerted about record syncing issues over email, Slack, PagerDuty and WhatsApp. Resolve issues from a centralized dashboard with retry and revert options.

Secure connection options

Securely connects to your systems with:

OAuth 2 SSH Tunnelling SSL certificates IP Whitelisting VPN gateway VPC peering and more

Related integrations

Every pair below is a real-time, two-way sync. Search all 265 integrations available for Google Pubsub and Slack.

Popular · 6 of 265
All Google Pubsub integrations All Slack integrations Browse all integrations
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