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How to fix cannot read properties of undefined (reading ‘push’) error with JavaScript?

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To fix cannot read properties of undefined (reading ‘push’) error with JavaScript, we should make sure we’re calling push on an array.

For instance, we write

const arr = [1, 2, 3, 4];
arr.push(5);

to call push on arr with 5 to append 5 as the last item of the arr array.

We can check if a variable is an array with the Array.isArray method.

By John Au-Yeung

Web developer specializing in React, Vue, and front end development.

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