How to Fix Fatal JavaScript invalid size error

Fatal JavaScript invalid size error occurs when you exceed a limit on the size of some data structure(object, array) in your code. If runtime finds a data structure like an array too large to be handled, it will throw an error like this.

To fix the error, ensure you “only access elements within the array’s bounds”. Alternatively, you can restructure your code to use a data structure that can handle the size of the data you are working with.

Common reasons for the error

  1. Maximum array size limit
  2. Infinite loops
  3. Incompatible Browser Extensions
  4. Memory leak and overload
  5. Resource Exhaustion

Reproducing the error

let arr = [];

for (let i = 0; i < 10000000000000; i++) {
   arr.push(i);
}

console.log(arr[100000001]);

Output

Screenshot of getting Fatal JavaScript invalid size error

How to fix it?

let arr = [];

for (let i = 0; i < 1000000; i++) {
  arr.push(i);
}

console.log(arr[100000]);

Output

100000

If you are using an array, you might want to split your data into chunks and process it so it won’t load on your server memory allocation.

The array has different exceptions, including RangeError, TypeError, ReferenceError, and SyntaxError. To handle these types of exceptions, use a try-catch block.

The best way to deal with this type of error is to examine the code causing the error and look for any issues that might be causing the data structure to be invalid.

Other solutions

Code proper loops

If you write a program that unintentionally goes into an infinite loop, then it will cause this error. Write a proper termination code that prevents this infinite loop.

Remove Incompatible Browser Extensions

Some browser extensions may interfere with the code. Please check if any plugin is interfering, and if there is, then temporarily disable it. Remove or update incompatible extensions as necessary.

Review External Dependencies

Make sure you are using the correct external dependencies and upgrade them from time to time so that they work smoothly.

Use debugging tools

Use Chrome DevTools, to debug your code. Set breakpoints, inspect variables, and step through your code to identify logical or runtime errors.

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