JSFiddle - React, Tailwind, and code Playground

HTML

<div ng-app ng-controller="MyCtrl">
    <ul>
        <li ng-repeat="(key, value) in userlist">{{value.username}}</li>
    <ul>
</div>

JavaScript

function MyCtrl($scope) {
    $scope.userlist = {
        "-K3OFVYXVUiT-oYXFmgX": {
            "id": 4658,
                "username": "shamon"
        },
            "-K3OFZAt9Qyy9v6z-XYQ": {
            "id": 9891,
                "username": "manu"
        },
            "-K3OFafyCi6g9UhdR2mA": {
            "id": 7219,
                "username": "hari"
        },
            "-K3OGYGGry3pU8_Qkjg_": {
            "id": 8028,
                "username": "shamonsha"
        }
    };
}