Connection Options in Mongoose | Rustcode

Connection Options in Mongoose

Mongoose's connect() method supports various options to customize the connection behavior to MongoDB. These options help manage authentication, timeout handling, connection pooling, retry logic, and other aspects critical to a stable and performant application.

Table of Content

Authentication Options

user and pass: Username and password for authentication.
authSource: Specifies the authentication database.
authMechanism: The authentication mechanism, e.g., SCRAM-SHA-1, SCRAM-SHA-256, etc.

Timeout Options

connectTimeoutMS: How long to wait for a connection before timing out.
socketTimeoutMS: How long the socket should stay idle before timing out.
serverSelectionTimeoutMS: Time to wait for server selection before throwing an error.

Connection Pooling Options

maxPoolSize: Maximum number of sockets in the connection pool.
minPoolSize: Minimum number of sockets in the connection pool.
waitQueueTimeoutMS: Maximum time to wait for a connection from the pool.

Retry and Buffering Options

retryWrites: Enables retryable writes.
bufferCommands: Enable or disable Mongoose command buffering.
bufferMaxEntries: Maximum number of operations Mongoose buffers.

SSL and Security Options

ssl: Enable SSL connection.
sslCA: Certificate authority for SSL.
sslCert and sslKey: Client certificate and key.

Example Connection with Options

const mongoose = require('mongoose');

const options = {
  user: 'myUser',
  pass: 'myPassword',
  authSource: 'admin',
  authMechanism: 'SCRAM-SHA-256',
  connectTimeoutMS: 10000,
  socketTimeoutMS: 45000,
  maxPoolSize: 10,
  retryWrites: true,
  useNewUrlParser: true,
  useUnifiedTopology: true
};

mongoose.connect('mongodb://localhost:27017/mydb', options)
  .then(() => console.log('Connected to MongoDB'))
  .catch(err => console.error('Connection error:', err));

Best Practices

Specify authentication options explicitly to avoid connection failures.
Adjust timeout options based on network conditions and application needs.
Tune connection pool size to balance resource usage and throughput.
Enable retryWrites for resilient write operations.
Use SSL options when connecting to secured MongoDB instances.

Conclusion

Mongoose connection options provide powerful controls over how your application connects to MongoDB, affecting authentication, performance, security, and reliability. Understanding and configuring these options will help you build robust Node.js applications with efficient and secure database connections.