How to make protractor press the enter key?

Keyup/Keydown is limited to modifier keys in WebDriver (shift, ctrl, etc). I think you want

browser.actions().sendKeys(protractor.Key.ENTER).perform();

The actions() is not required.

You can do something like:

var input = $('#someInput');
input.sendKeys(protractor.Key.ENTER);

Update: some people have complained that you are not sending the enter to browser. If you want to do this just change your selector:

$('body').sendKeys(protractor.Key.ENTER);

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