How do I replicate MongoDB data to MotherDuck?

Sign up for Weld, connect MongoDB as a source and MotherDuck as a destination. Weld handles the extraction, loading, and lets you transform data using SQL or dbt.

What MongoDB data can I replicate to MotherDuck?

You can replicate the objects the MongoDB connector exposes. The available objects depend on your MongoDB account permissions and configuration.

How often does Weld replicate data from MongoDB?

Sync frequency depends on your Weld plan. Schedules range from every 5 minutes to daily intervals. Each sync processes only new and changed data.

Can I transform MongoDB data before it lands in MotherDuck?

Yes. Weld supports SQL-based transformations in the platform and integrates with dbt Cloud. You can clean, join, and model your data before analysis.

Is the MongoDB to MotherDuck integration secure?

Yes. Weld encrypts all data in transit and at rest, is SOC 2 Type II certified, and supports IP whitelisting. Credentials are stored encrypted and never logged.

MongoDB to MotherDuck integration

Replicate your MongoDB data into MotherDuck with Weld. Automatically replicate the tables you choose from MongoDB into MotherDuck, keeping your analytics layer up to date and ready for querying.

Start for free View setup guide

4.8 on G2

Source

Weld

Warehouse

Weld · New sync

SourceMongoDBConnected

Tables to sync

Your own tables, picked when you set up the sync.

Extract
Load
Keep in sync

DestinationMotherDuckReady

mongodb schema

mongodb.Synced
mongodb.Syncing
mongodb.Synced
mongodb.Synced

Trusted by data and AI teams

How it works

How to set up MongoDB to MotherDuck in Weld.
In the app, with the API or an agent.

Setup guide API guide MCP docs

Weld · New MongoDB sync

New connectionMongoDBAuthorised

Connection namemongodb

AuthorizeOpens MongoDB to grant read access

Use cases

Why replicate MongoDB to MotherDuck?
Ready for analysis.

Centralizing your MongoDB data in MotherDuck lets you join it with other data sources for cross-platform analytics and deeper insights.

Build reliable dashboards and reports by querying MongoDB data directly in MotherDuck using SQL or your preferred BI tool.

Consolidate data from MongoDB alongside other databases and applications in a single database for a unified analytical layer.

Database replication for analytics
Replicate your MongoDB production data to MotherDuck without impacting database performance. Query historical data without load on your primary database.
Centralized data warehouse
Bring MongoDB data into MotherDuck alongside other sources to create a single source of truth for your organization.
Automated reporting
Replace manual exports and spreadsheet-based reporting with automated pipelines from MongoDB to MotherDuck. Connect BI tools like Looker, Metabase, or Power BI.

Data

What data can you replicate?
From MongoDB to MotherDuck.

Weld syncs the objects the MongoDB connector exposes into MotherDuck, and you choose which tables and fields to include. The connector's docs list what is available.

Weld MCP server

Ask your agent.
It queries MotherDuck for you.

Connect Claude, Cursor, ChatGPT or your own agent to Weld over MCP. It reads the MongoDB context, finds the tables it needs and runs the query in MotherDuck.

Set up the MCP server

Claude CodeOpus 5

ConnectedWeld MCP

Which MongoDB tables do we have in MotherDuck, and which is the largest?

Looking up what Weld has synced from MongoDB.

●weld·search_available_references

⎿raw.mongodb.*

tables, columns and freshness

●weld·get_reference_schema

⎿columns, types and nullability

●weld·run_query

⎿select count(*) from {{raw.mongodb.…}}

submitted

●weld·get_query_status

⎿DONE

●weld·get_query_result

⎿rows returned

✓Answered from MongoDB data in MotherDuck

>Ask about your MongoDB dataMCP

Under the hood

Technical considerations.
What to expect.

Incremental syncing: Weld uses incremental syncing where supported by the MongoDB API, loading only new and updated records to minimize data transfer and warehouse costs.
Change data capture: For MongoDB, Weld can use log-based replication (CDC) to capture inserts, updates, and deletes without querying the entire table on every sync.
Schema handling: Weld automatically manages schema changes. If MongoDB adds new fields, they're detected and added to the corresponding MotherDuck tables.
Data freshness: Sync frequency depends on your Weld plan. Most connectors support schedules from every 5 minutes up to daily intervals.
Security: All data is encrypted in transit (TLS) and at rest. Weld is SOC 2 Type II compliant and supports IP whitelisting for database connections.

Resources

Keep reading.
Guides, docs and schema.

Documentation

MongoDB setup guide

How to connect MongoDB to Weld, step by step.

Documentation

MotherDuck setup guide

How to connect MotherDuck to Weld, step by step.

Connector

MongoDB connector

Everything Weld does with MongoDB.

Connector

MotherDuck connector

Everything Weld does with MotherDuck.

FAQ

Common questions.
About MongoDB to MotherDuck.

Start syncing MongoDB to MotherDuck.

Set up your MongoDB data pipeline in minutes. No credit card required. Free for 14 days.

Source

Weld

Warehouse

Start for free Talk to us

Related integrations.
More with MongoDB and MotherDuck.

View all

MongoDB to MotherDuck integration

How to set up MongoDB to MotherDuck in Weld.In the app, with the API or an agent.

Why replicate MongoDB to MotherDuck?Ready for analysis.

Database replication for analytics

Centralized data warehouse

Automated reporting

What data can you replicate?From MongoDB to MotherDuck.

Ask your agent.It queries MotherDuck for you.

Technical considerations.What to expect.

Keep reading.Guides, docs and schema.

Common questions.About MongoDB to MotherDuck.