What are some strategies for optimizing memory usage in Node.js applications?

There are multiple strategies you can adopt to optimize memory usage in your Node.js app. First, you should profile your app to identify leaks using tools like Node Inspector or heapdump. Then, do your best to optimize your code by avoiding global variables, cleaning up unused objects, and using Buffers efficiently. You can also implement streaming for handling large datasets instead of loading them entirely into your memory. A thing to keep note of is to regularly update Node.js to benefit from future performance improvements. Lastly, consider using lightweight npm packages and scrutinizing dependencies to ensure they are not memory-intensive.