JavaScript heap out of memory error in long-running Node.js apps

After running for a while, my Node.js process crashes with: pgsql Copy code FATAL ERROR: Reached heap limit Allocation failed – JavaScript heap out of memory What typically causes this, and how can I prevent it?

This error often points to a memory leak. In long-lived Node.js apps, memory can accumulate due to: • Global arrays/objects never cleared • Circular references • Open connections or listeners not releasing memoryturn0search2turn0search6turn0search9 Diagnostics & Fixes: • Use heap snapshots via Chrome DevTools or v8-profiler to locate growing references. • Avoid global variables; store state locally or clear caches. • Remove timers, intervals, and event listeners when done. • Break circular references, or ensure objects don't hold onto each other indefinitely. • Close database or network connections properly, always send a response, and end the request lifecycle. These steps help prevent memory buildup and improve application stability.turn0search2turn0search6turn0search9