Common Mistakes When Creating a Node.js Server

Common Mistakes When Creating a Node.js Server

Creating a Node.js server has predictable mistakes. Here are the common ones.

Forgetting to Call response.end

Without end, the response never finishes and the request hangs. Always call response.end after sending the body, even if the body is empty.

Not Handling the Request Body

The request body is a stream. If you do not read it, you miss the body data. Use the 'data' and 'end' events, or Express's body parsing middleware.

Hardcoding the Port

Hardcoding port 3000 means conflicts in production where another process uses that port. Use process.env.PORT || 3000 so the environment can set the port.

Not Handling Errors in the Server

The server can error on listen (port already in use). Handle the 'error' event on the server to catch these instead of crashing.

Mixing Sync and Async

Calling sync APIs in the request handler blocks the event loop. Always use async APIs in request handlers.

No Error Boundaries

An unhandled error in a route handler crashes the process. Use a global error handler, especially in Express, to catch and handle errors gracefully.

The Takeaway

Common Node.js server mistakes include forgetting response.end, not reading the request body, hardcoding the port, not handling server errors, mixing sync and async APIs, and having no error boundaries. Avoid these and your server is solid.