Fix Node.js event loop blocking, memory leaks, async/await bugs, Express middleware issues, production server problems, and enterprise backend issues
CPU-intensive synchronous operation blocks the event loop, freezing the entire server.
Database connections are opened but never closed, causing connection pool exhaustion.
Unhandled promise rejections crash the Node.js process in production.
Event listeners attached to EventEmitter are never removed, causing memory leaks.
Multiple concurrent file writes corrupt data because operations are not serialized.
Middleware doesn't call next(), causing requests to hang indefinitely.
setInterval timers continue running after server shutdown, preventing graceful exit.
Large buffers are created but never released, causing memory growth.
Synchronous crypto operations block the event loop, freezing the server.
Event emitter and listener reference each other, preventing garbage collection.
Multiple async file operations race, causing data corruption.
Uncaught exceptions crash the Node.js process, bringing down the entire application.
Large buffers are retained in memory, causing memory issues.
Worker threads continue running after main thread exits, causing resource leaks.
Streams are not properly piped or closed, causing memory buildup.
Cluster worker crashes but doesn't restart, reducing available workers.
Async function rejects but caller doesn't handle it, causing unhandled rejection.
Closures capture large objects, preventing garbage collection.
Middleware doesn't call next(), blocking request pipeline.
Child process continues running after parent exits, causing zombie processes.
Redis connections are not closed, causing connection pool exhaustion.
JSON.parse throws on invalid input, crashing the application.
Error objects with stack traces are retained, preventing GC of referenced code.
setTimeout timers are not cleared, continuing to run after component cleanup.
Module cache retains old data, causing stale values to be served.
Synchronous crypto operations block event loop, freezing the server.