Error: ngRepeat:dupes Duplicate Key in Repeater (even though no dupes in data) - angularjs

Question

<div ng-repeat="item in skippedFiles.openCategories">
{{skippedFiles.openCategories}} prints:
[
{
"name": "Files with Code Differences",
"description": "Customizedfiles in which the code is different between the instance record and the platform record",
"sys_id": "undefined"
},
{
"name": "Files Deleted in the Instance",
"description": "Files which have been deleted by a developer or system administrator during thecustomization of out-of-box code",
"sys_id": "49e13d4113b8e3442a393ac2e144b0e9"
},
{
"name": "Files Deleted in Platform",
"description": "Files which are no longer a part of a platform release, resulting in deletion of file",
"sys_id": "6912358113b8e3442a393ac2e144b025"
}
I have validated JSON and there are no dupes in it and yet angular throws Duplicate Key in Repeater.
I have tried track by $index but that does not help.

Answer 1

Not sure what's wrong in your code, unless you paste the entire code here, would be difficult to answer.
I have created a code for you based on your question.
Have a look and let me know.
function LoginController($scope) {
$scope.user = {
firstName: "Foo",
lastName: "Bar"
};
$scope.skippedFiles = {};
$scope.skippedFiles.openCategories = [
{
"name": "Files with Code Differences",
"description": "Customizedfiles in which the code is different between the instance record and the platform record",
"sys_id": "undefined"
},
{
"name": "Files Deleted in the Instance",
"description": "Files which have been deleted by a developer or system administrator during thecustomization of out-of-box code",
"sys_id": "49e13d4113b8e3442a393ac2e144b0e9"
},
{
"name": "FilesDeleted in Platform",
"description": "Files which are no longer a part of a platform release, resulting in deletion of file",
"sys_id": "6912358113b8e3442a393ac2e144b025"
}
]
};
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<div ng-app ng-controller="LoginController">
<div>Hello {{ user.firstName }}</div>
<div ng-repeat="item in skippedFiles.openCategories">
{{item.name}}
{{item.description}}
</div>
</div>