Formio - How to add Javascript from the Builder? (runs 2 times or more)

Question

I am using the **Formio **Plugin. What is the correct way to add "Javascript" to the Builder?

I tried this and other ways:

• I created a "Text Field" component.

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• I placed a "Console.log" in "Custom Default".

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• Finally, when I save my form, I open it and my console shows my console.log 2 times :(

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Why did this happened? I've tried reading the documentation, but I'm having a bit of a hard time understanding it. I hope someone can see this. I thank you very much!!