MongoDB Connection String Builder

Build your MongoDB connection URI visually. Configure host, port, authentication, SSL, replica sets, and additional options — then copy the ready-to-use string.

Protocol

Host

Port

Database (optional)

Authentication

TLS / SSL

Replica Set (optional)

Additional Options (key=value)

No additional options. Click "Add" to include custom query parameters.

Connection String

mongodb://localhost

MongoDB Connection String Format

A MongoDB connection string (also called a connection URI) is the standard way to tell drivers and tools how to connect to your database. The format follows the URI specification and encodes the hostname, credentials, database name, and connection preferences in a single string.

The general structure is:

mongodb://[username:password@]host[:port][/database][?options]

For MongoDB Atlas and other hosted services that use DNS seed lists, the mongodb+srv:// protocol is used instead. This resolves the hostname via DNS SRV records, which means you do not need to specify a port or multiple hosts manually.

Common Connection Options

Connection options are appended as query parameters after the database name. Here are the most commonly used options:

Option	Type	Default	Description
retryWrites	boolean	true	Enable retryable writes for transient network errors.
w	string \| number	"majority"	Write concern. Controls acknowledgement of write operations.
maxPoolSize	number	100	Maximum number of connections in the connection pool.
connectTimeoutMS	number	30000	Timeout in milliseconds for establishing a connection.
authSource	string	"admin"	Database used for authentication when credentials are provided.
replicaSet	string	-	Name of the replica set to connect to.
tls	boolean	false	Enable TLS/SSL for the connection.
readPreference	string	"primary"	How reads are routed to replica set members (primary, secondary, nearest, etc.).

Examples

Local Development

Connect to a MongoDB instance running on your machine with default settings:

mongodb://localhost:27017/myapp

MongoDB Atlas (SRV)

Connect to a MongoDB Atlas cluster with authentication and retryable writes:

mongodb+srv://admin:[email protected]/production?retryWrites=true&w=majority

Replica Set

Connect to a three-node replica set with TLS enabled:

mongodb://dbuser:[email protected]:27017,mongo2.example.com:27017,mongo3.example.com:27017/mydb?replicaSet=rs0&tls=true

Manage MongoDB visually with Mongon

Paste your connection string into Mongon and start browsing collections, navigating relations, and building queries — all in a native macOS app.

Download Mongon