10 Common Node.js Mistakes That Can Crash Your App (And How to Avoid Them)

Since its introduction, Node.js has been adopted for building many robust and complex web services thanks to its high‑concurrency performance and efficient development experience. These services are not only highly scalable but have also proven their resilience over long periods on the Internet.

However, its simplicity can also lead developers to make mistakes that either degrade performance or render a Node.js application completely unusable. Below are ten common errors frequently made by Node.js developers:

Blocking the event loop

Calling the same callback multiple times

Deeply nested callbacks

Expecting callbacks to execute synchronously

Assigning to exports instead of module.exports

Throwing exceptions from inside callbacks

Assuming Number is an integer type

Ignoring the benefits of streaming APIs

Using console.log for debugging

Not employing monitoring tools

For details on the impact of each mistake and how to avoid them, refer to the original article linked below.