FAQ: Why is my JavaScript hook generating a "cannot read property" error?

Integrator.io
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1

Generally, the error "cannot read property 'fieldName' of undefined" stems from your JavaScript hook. It's trying to read a property from a field that is not available.

For example:

{
    "field1": "value1",
    "field2": "value2"
}

Hook code:

var sample = field1.innerField.testField;

The above code generates the error: "cannot read property 'testField' from undefined", because field1.innerField is undefined.