Heap out of memory Node.js

Why This Happens

In Node.js, the node.js process ran out of memory. This is one of the most common Node.js errors developers encounter. Understanding the root cause helps you fix it quickly and prevent it from recurring.

The Problem

const arr = new Array(1e9);

The Fix

// Increase memory limit:
// node --max-old-space-size=4096 app.js
// Or process data in streams

Step-by-Step Fix

1. 1

   Identify the error

   Look at the error message: FATAL ERROR: heap out of memory. This tells you exactly what went wrong.

2. 2

   Find the cause

   Check the stack trace to find which line of your Node.js code triggered this error.

3. 3

   Apply the fix

   Use the corrected code pattern shown above. Test to confirm the error is resolved.