# Preventing a form submission in JavaScript

If necessary, you can prevent the form from being submitted. This is done through the already known to you `preventDefault`. Let's look at an example.

Let's say we have the following form:

`<form action="/handler/" method="POST"> <input name="test1"> <input name="test2"> <input type="submit"> </form>`

Get a reference to it into a variable:

`let form = document.querySelector('form');`

Form submission can be caught via the `submit` event:

`form.addEventListener('submit', function() { });`

Let's prevent form submission now:

`form.addEventListener('submit', function(event) { event.preventDefault(); });`

Given a form with an input. When you try to submit the form, check that a correct email is entered in the input. If this is not the case, prevent the form submission and display a message about it.

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