Where do I typically find the MongoDB connection string in my Node.js application?

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Where do I typically find the MongoDB connection string in my Node.js application?
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The connection string is usually found in your main application file (e.g., `app.js`, `server.js`), a configuration file (e.g., `config.js`, `.env`), or an environment variable. Look for variables like `MONGODB_URI`, `MONGO_URL`, or similar names that contain a `mongodb://` URL.