Real-time
Two-way sync
Changes in Klaviyo or MongoDB instantly reflect in both systems. No stale data, no manual imports.
Business productivity ⇄ Database
Klaviyo to MongoDB integration — real-time, two-way sync
Keep Klaviyo and MongoDB in sync without custom scripts. Cut weeks of integration work, eliminate silent data drift, and give your team a single, reliable source of truth.
- SOC 2 and 6 other compliance frameworks
- POC with real engineers in minutes
Adopted by fast-scaling companies moving mission-critical data in real time
Case study
Migrated from Mulesoft
Case study
Migrated from Celigo
Migrated from Heroku Connect
Migrated from Matillion
Case study
Migrated from Fivetran
Case study
Migrated from Celigo
Why teams connect Klaviyo and MongoDB
Mirror Klaviyo's data into MongoDB so your own code can read and write it like any other table, with changes flowing both ways in seconds.
Engineers integrate with tools like Klaviyo through APIs, which means auth, pagination, rate limits, webhooks, and retry logic, all maintained forever and all different for every tool. Meanwhile the data would be trivial to use if it simply lived in MongoDB.
Stacksync mirrors Campaigns, Flows, Templates, Catalog Items from Klaviyo into Change streams, GridFS files, Databases, Collections in MongoDB and keeps both sides in sync in real time. Your services query the database directly, and inserts or updates your code makes flow back into Klaviyo, so the tool and the database never disagree.
Common use cases
- Mirror campaign and flow engagement events into a warehouse for revenue attribution alongside order data
- Keep suppression and consent status consistent between Klaviyo and other email or SMS tools
- Keep a MongoDB-backed product catalog aligned with an ERP's item master in both directions.
- Consolidate documents from multiple clusters or tenants into a single warehouse-facing store.
One integration pattern for the whole stack
Every synced tool looks the same from the database, so each new integration is configuration, not a new codebase.
Read Klaviyo with a query
Records from Klaviyo are ordinary rows in MongoDB; join them, index them, and use them in application logic without touching the vendor API.
Automate Klaviyo from your codebase
Write to the synced tables in MongoDB and Stacksync propagates the change into Klaviyo, replacing custom integration code.
What you can sync between Klaviyo and MongoDB
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.
| Klaviyo objects | MongoDB objects | |
|---|---|---|
| Lists Static audience memberships sync in from CRMs and forms for targeting. | GridFS files Chunked file storage whose metadata can be referenced by synced documents. | |
| Segments Dynamic audiences are readable so other tools can mirror who qualifies. | Databases Logical groupings of collections that scope a sync connection. | |
| Events Timestamped behavioral records tied to metrics; external order and product events are pushed in to trigger flows. | Collections The table-like sync unit; each collection maps to a table or object in the paired system. | |
| Metrics Event type definitions organize the activity stream used in segmentation and attribution. | Documents BSON records created, updated, and deleted during syncs, keyed by _id. | |
| Campaigns Email and SMS sends expose performance data for warehouse-based reporting. | Embedded documents and arrays Nested structures that syncs flatten or map to related records in relational targets. | |
| Flows Automation definitions and their engagement data sync outward for attribution. | Indexes Keep lookups by sync key fast on large collections. |
What ships with Klaviyo ⇄ MongoDB
Connect Klaviyo and MongoDB for flexible, real-time data sync.
Real-time sync, workflow automation, event queues, EDI, and monitoring, for every Klaviyo–MongoDB connection.
No-code + pro-code
Workflow automation
Trigger automated workflows whenever Klaviyo or MongoDB 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 Klaviyo or MongoDB record.
Observability
Monitoring
Track your Klaviyo ⇄ MongoDB sync health, view errors, and replay failed events in one click.
Trading partners
EDI
Transform legacy EDI complexity into simple database interactions between Klaviyo and MongoDB.
How the Klaviyo and MongoDB connectors work
Klaviyo
- Integration surface
- REST API compliant with the JSON:API specification
- Authentication
- OAuth 2.0 for apps or private API keys
- Change detection
- Polling on updated timestamps; outbound webhooks exist for event topics (availability depends on plan or app-partner status) and as flow webhook actions
- Capabilities
- read · write · webhooks
- Rate limits
- Per-endpoint burst and steady rate limits apply
MongoDB
- Integration surface
- MongoDB wire protocol via official drivers; Atlas additionally offers an administration REST API for cluster management
- Authentication
- Database credentials (username/password) or TLS/SSL X.509 certificate (.pem upload), entered individually or via a MongoDB connection string (SRV or standard); Stacksync IP allowlisting required
- Change detection
- MongoDB oplog and change streams (requires the database to run as a replica set — even single-node); Stacksync leverages these built-in tools to track changes in real time
- Capabilities
- read · write · CDC
How it works
How to connect Klaviyo to MongoDB — 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.
- 01
Connect your apps
Authenticate Klaviyo and MongoDB with each platform's native method — OAuth, API keys, or service accounts — plus secure options like SSH tunneling, IP whitelisting, and VPC peering.
Klaviyo
connected
MongoDB
connected
OAuth 2.0SSH tunnelSSL certificateVPC peering - 02
Choose tables
Pick the Klaviyo and MongoDB 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.
objects · Klaviyo ⇄ MongoDBCustomers 12,480Sales Orders 8,213Invoices 5,902Items 1,344 - 03
Map fields
Fields map automatically even when names and types differ. Stacksync handles transformation and type casting for you, zero configuration required.
Klaviyo MongoDBCompany company_name textEmail email textAmount amount numericCreated created_at timestamp
FAQ
Klaviyo and MongoDB integration FAQ
-
Yes. Stacksync provides a managed, real-time two-way integration between Klaviyo and MongoDB: authenticate both systems, choose the objects to sync (such as Klaviyo's Lists and Segments), map fields visually, and changes propagate both ways in milliseconds — no code required.
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Change detection on Klaviyo: Polling on updated timestamps; outbound webhooks exist for event topics (availability depends on plan or app-partner status) and as flow webhook actions. On MongoDB: MongoDB oplog and change streams (requires the database to run as a replica set — even single-node); Stacksync leverages these built-in tools to track changes in real time. Each detected change propagates to the other side in milliseconds, with field-level conflict resolution and an inspectable event log.
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On the Klaviyo side: Campaigns, Flows, Templates, Catalog Items, plus custom fields where Klaviyo exposes them. On the MongoDB side: Change streams, GridFS files, Databases, Collections. Stacksync auto-detects both schemas and converts types between the two systems.
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Yes. Each object mapping can be bidirectional or restricted to a single direction (both systems accept writes). Read-only mirrors, one-way pushes, and full two-way sync can be mixed in the same integration.
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Common patterns for Klaviyo and MongoDB: One integration pattern for the whole stack; Read Klaviyo with a query; Automate Klaviyo from your codebase. Every synced tool looks the same from the database, so each new integration is configuration, not a new codebase.
-
Klaviyo: REST API compliant with the JSON:API specification. Authentication: OAuth 2.0 for apps or private API keys. MongoDB: MongoDB wire protocol via official drivers; Atlas additionally offers an administration REST API for cluster management. Authentication: Database credentials (username/password) or TLS/SSL X.509 certificate (.pem upload), entered individually or via a MongoDB connection string (SRV or standard); Stacksync IP allowlisting required. Stacksync manages authentication, retries, and rate limits on both sides.
SECURITY
Security teams love 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.
SOC 2 type II
ISO 27001
HIPAA BAA
GDPR
CCPA
CSA STAR
DPF US-EU-UK-CH
→ SECURITY WITH BENEFITS
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:
Related integrations
Every pair below is a real-time, two-way sync. Search all 386 integrations available for Klaviyo and MongoDB.
Popular · 8 of 386
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Klaviyo ⇄ Airtable -
Klaviyo ⇄ AWS Aurora MySQL - Klaviyo ⇄ AWS Aurora PostgreSQL
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Klaviyo ⇄ CockroachDB -
MongoDB ⇄ Amazon Seller Central -
MongoDB ⇄ SendGrid -
MongoDB ⇄ Twilio -
MongoDB ⇄ GitHub
No integrations match .
