MongoDB

Before <a href="https://docs.atlas.mongodb.com/connect-to-cluster/" rel="nofollow noopener noreferrer" target="_blank">connecting to an Atlas cluster</a>, ensure your application can reach your <a href="https://docs.atlas.mongodb.com/" rel="nofollow noopener noreferrer" target="_blank">MongoDB Atlas</a> environment by <a href="https://docs.atlas.mongodb.com/connect-to-cluster/#open-ports-27015-to-27017-to-access-service-databases" rel="nofollow noopener noreferrer" target="_blank">allowing your applications to make outbound connections to ports 27015 to 27017</a> to TCP and UDP traffic on Atlas hosts.

To connect to an Atlas cluster:

<a href="https://docs.atlas.mongodb.com/security-whitelist/" rel="nofollow noopener noreferrer" target="_blank">Configure an IP access list entry</a> on the Atlas project’s IP access list for Network Access

<a href="https://docs.mongodb.com/manual/core/security-users/" rel="nofollow noopener noreferrer" target="_blank">Create a Database User</a> with access to your database(s) for Database Access

Copy your cluster's <a href="https://docs.mongodb.com/manual/reference/connection-string/index.html" rel="nofollow noopener noreferrer" target="_blank">connection string</a> by hitting CONNECT on your cluster and following the instructions for your chosen connection method

Paste the connection string into your application (to <a href="https://docs.atlas.mongodb.com/driver-connection/" rel="nofollow noopener noreferrer" target="_blank">connect via a driver</a>), the command line (to <a href="https://docs.atlas.mongodb.com/command-line-tools/" rel="nofollow noopener noreferrer" target="_blank">connect via the command line tools</a>) or the Compass UI (to <a href="https://docs.atlas.mongodb.com/compass-connection/" rel="nofollow noopener noreferrer" target="_blank">connect via Compass</a>).

- <a href="https://docs.atlas.mongodb.com/security-whitelist/" rel="nofollow noopener noreferrer" target="_blank">Configure an IP access list entry</a> on the Atlas project’s IP access list for Network Access
- <a href="https://docs.mongodb.com/manual/core/security-users/" rel="nofollow noopener noreferrer" target="_blank">Create a Database User</a> with access to your database(s) for Database Access
- Copy your cluster's <a href="https://docs.mongodb.com/manual/reference/connection-string/index.html" rel="nofollow noopener noreferrer" target="_blank">connection string</a> by hitting CONNECT on your cluster and following the instructions for your chosen connection method
- Paste the connection string into your application (to <a href="https://docs.atlas.mongodb.com/driver-connection/" rel="nofollow noopener noreferrer" target="_blank">connect via a driver</a>), the command line (to <a href="https://docs.atlas.mongodb.com/command-line-tools/" rel="nofollow noopener noreferrer" target="_blank">connect via the command line tools</a>) or the Compass UI (to <a href="https://docs.atlas.mongodb.com/compass-connection/" rel="nofollow noopener noreferrer" target="_blank">connect via Compass</a>).

For instructions on connecting to your Atlas Cluster see:

<a href="https://docs.atlas.mongodb.com/driver-connection/" rel="nofollow noopener noreferrer" target="_blank">Connect via Driver</a> to connect with an application using a <a href="https://docs.mongodb.com/drivers/" rel="nofollow noopener noreferrer" target="_blank">MongoDB driver</a>

<a href="https://docs.atlas.mongodb.com/compass-connection/" rel="nofollow noopener noreferrer" target="_blank">Connect via Compass</a>

<a href="https://docs.atlas.mongodb.com/mongo-shell-connection/" rel="nofollow noopener noreferrer" target="_blank">Connect via mongo Shell</a> to connect and use the <a href="https://docs.mongodb.com/manual/crud/" rel="nofollow noopener noreferrer" target="_blank">MongoDB CRUD Operations</a>

<a href="https://docs.atlas.mongodb.com/command-line-tools/" rel="nofollow noopener noreferrer" target="_blank">Connect to a Cluster using Command Line Tools</a>

<a href="https://docs.atlas.mongodb.com/bi-connection/" rel="nofollow noopener noreferrer" target="_blank">Connect via BI Connector for Atlas</a>

<a href="https://intercom-help.mongodb.com/en/articles/4658883-connecting-your-mongodb-atlas-cluster-to-robo3t-robomongo">Connecting to Atlas using Robo 3T (formerly RoboMongo)</a>

- <a href="https://docs.atlas.mongodb.com/driver-connection/" rel="nofollow noopener noreferrer" target="_blank">Connect via Driver</a> to connect with an application using a <a href="https://docs.mongodb.com/drivers/" rel="nofollow noopener noreferrer" target="_blank">MongoDB driver</a>
- <a href="https://docs.atlas.mongodb.com/compass-connection/" rel="nofollow noopener noreferrer" target="_blank">Connect via Compass</a>
- <a href="https://docs.atlas.mongodb.com/mongo-shell-connection/" rel="nofollow noopener noreferrer" target="_blank">Connect via mongo Shell</a> to connect and use the <a href="https://docs.mongodb.com/manual/crud/" rel="nofollow noopener noreferrer" target="_blank">MongoDB CRUD Operations</a>
- <a href="https://docs.atlas.mongodb.com/command-line-tools/" rel="nofollow noopener noreferrer" target="_blank">Connect to a Cluster using Command Line Tools</a>
- <a href="https://docs.atlas.mongodb.com/bi-connection/" rel="nofollow noopener noreferrer" target="_blank">Connect via BI Connector for Atlas</a>
- <a href="https://intercom-help.mongodb.com/en/articles/4658883-connecting-your-mongodb-atlas-cluster-to-robo3t-robomongo">Connecting to Atlas using Robo 3T (formerly RoboMongo)</a>

For troubleshooting connection issues:

<a href="https://docs.atlas.mongodb.com/troubleshoot-connection/" rel="nofollow noopener noreferrer" target="_blank">Troubleshoot Connection Issues</a>

<a href="https://docs.atlas.mongodb.com/reference/atlas-limits/#connection-limits-and-cluster-tier" rel="nofollow noopener noreferrer" target="_blank">Connection Limits and Cluster Tier</a>

<a href="https://docs.atlas.mongodb.com/data-explorer/" rel="nofollow noopener noreferrer" target="_blank">Data Explorer</a> for managing Atlas data

<a href="https://docs.atlas.mongodb.com/tutorial/test-failover/" rel="nofollow noopener noreferrer" target="_blank">Test Failover</a> to test the failure of a <a href="https://docs.mongodb.com/manual/reference/glossary/#term-primary" rel="nofollow noopener noreferrer" target="_blank">primary</a> replica set member on an Atlas cluster

<a href="https://docs.atlas.mongodb.com/best-practices-connecting-to-aws-lambda/" rel="nofollow noopener noreferrer" target="_blank">Best Practices Connecting from AWS Lambda</a>

- <a href="https://docs.atlas.mongodb.com/troubleshoot-connection/" rel="nofollow noopener noreferrer" target="_blank">Troubleshoot Connection Issues</a>
- <a href="https://docs.atlas.mongodb.com/reference/atlas-limits/#connection-limits-and-cluster-tier" rel="nofollow noopener noreferrer" target="_blank">Connection Limits and Cluster Tier</a>
- <a href="https://docs.atlas.mongodb.com/data-explorer/" rel="nofollow noopener noreferrer" target="_blank">Data Explorer</a> for managing Atlas data
- <a href="https://docs.atlas.mongodb.com/tutorial/test-failover/" rel="nofollow noopener noreferrer" target="_blank">Test Failover</a> to test the failure of a <a href="https://docs.mongodb.com/manual/reference/glossary/#term-primary" rel="nofollow noopener noreferrer" target="_blank">primary</a> replica set member on an Atlas cluster
- <a href="https://docs.atlas.mongodb.com/best-practices-connecting-to-aws-lambda/" rel="nofollow noopener noreferrer" target="_blank">Best Practices Connecting from AWS Lambda</a>

See also the article <a href="https://intercom.help/mongodb-atlas/en/articles/3069111-connections-in-mongodb-atlas-clusters" rel="nofollow noopener noreferrer" target="_blank">Connections in MongoDB Atlas Clusters</a> explaining Atlas connections and where to see them.