Getting error on processing array of 20000 in node.js

Question

What is the maximum assignable length of an array in node.js? Why do these errors occur?

"FATAL ERROR: invalid array length Allocation failed - JavaScript heap out of memory"

This error occurs when I execute this code.

const answer = [];

for (let i = 0; i < 20000; i++) {
  for (let j = 0; j < 20000; j++) {
    answer.push(1);
  }
}

I think it means that the length that can be assigned to the array is exceeded. Then, what is the maximum allocation length of an array in node.js?

Thanks!!! :)

Ran Turner · Accepted Answer · 2021-03-24 11:55:25Z

2

There is a strict limitation for memory usage in the V8 JavaScript engine. the default are limits of ~512mb for 32-bit and ~1gb on 64-bit.

you can modify it like this for example:

node --max-old-space-size=4096 yourNodeFile.js

This will change the limitation to something like 4GB

answered Mar 24, 2021 at 11:50

Ran Turner

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1 Comment

WOW, Thank you so much !! :)