AngularJS does not send hidden field value

You cannot use double binding with hidden field. The solution is to use brackets :

<input type="hidden" name="someData" value="{{data}}" /> {{data}}

EDIT : See this thread on github : https://github.com/angular/angular.js/pull/2574

EDIT:

Since Angular 1.2, you can use 'ng-value' directive to bind an expression to the value attribute of input. This directive should be used with input radio or checkbox but works well with hidden input.

Here is the solution using ng-value:

<input type="hidden" name="someData" ng-value="data" />

Here is a fiddle using ng-value with an hidden input: http://jsfiddle.net/6SD9N

You can always use a type=text and display:none; since Angular ignores hidden elements. As OP says, normally you wouldn't do this, but this seems like a special case.

<input type="text" name="someData" ng-model="data" style="display: none;"/>