Sometimes, we want to fix cannot set property of undefined with JavaScript.

In this article, we’ll look at how to fix cannot set property of undefined with JavaScript.

How to fix cannot set property of undefined with JavaScript?

To fix cannot set property of undefined with JavaScript, we should make sure we’re setting a property on an object.

For instance, we write

d = {
  [a]: {
    greetings: b,
    data: c,
  },
};

d[a]["greeting"] = "hello";

to assign d to an object.

Then we can set d[a]["greeting"] to 'hello' since d[a] is an object that has the greetings property.

Conclusion

To fix cannot set property of undefined with JavaScript, we should make sure we’re setting a property on an object.