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What are the AngularJs Global API ?

Last Updated : 12 Jul, 2025
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Global API in AngularJS: API stands for Application Programming Interface. It is a set of protocols, routines, and tools for building software applications that allow the user to interact with the application and perform several tasks. In AngularJS Global API is a set of global Javascript functions used for performing tasks like comparing objects, iterating objects, and converting data. 

Some API functions in AngularJS are shown below:

angular.lowercase: This is a built-in filter that is used to transform any string into lowercase. 

Syntax:

angular.lowercase(string);

Example 1: This example describes the basic usage of the Global API that is utilized to convert the string to lowercase.

HTML 
<!DOCTYPE html>
<html>

<head>
    <script src=
"https://ajax.googleapis.com/ajax/libs/angularjs/1.6.9/angular.min.js">
    </script>
</head>

<body>
    <div ng-app="App" ng-controller="Ctrl">
        <p>{{"Before Conversion: " + i1 }}</p>
        <p>{{"After Conversion: " + i2 }}</p>
    </div>
    <script>
        var app = angular.module('App', []);
        app.controller('Ctrl', function($scope) {
            $scope.i1 = "GeeksforGeeks";
            // converting string into lowercase
            $scope.i2 = angular.lowercase($scope.i1);
        });
    </script>
</body>
</html>

Output:

Before Conversion: GeeksforGeeks                   
After Conversion: geeksforgeeks

angular.uppercase: This is a built-in filter that is used to transform any string into uppercase. 

Syntax:

angular.uppercase(string);

Example 2: This example describes the basic usage of the Global API that is utilized to convert the string to uppercase.

HTML 
<!DOCTYPE html>
<html>

<head>
    <script src=
"https://ajax.googleapis.com/ajax/libs/angularjs/1.6.9/angular.min.js">
    </script>
</head>

<body>
    <div ng-app="App" ng-controller="Ctrl">
        <p>{{"Before Conversion: " + i1 }}</p>
        <p>{{"After Conversion: " + i2 }}</p>
    </div>
    <script>
        var app = angular.module('App', []);
        app.controller('Ctrl', function($scope) {
            $scope.i1 = "geeksforGeeks";
            
            // converting string into uppercase
            $scope.i2 = angular.uppercase($scope.i1);
        });
    </script>
</body>

</html>

Output:

Before Conversion: geeksforgeeks
After Conversion: GEEKSFORGEEKS

angular.isString: This is a built-in filter that is used to check whether the given value is a string or not, if the value is a string then it returns true else it returns false. 

Syntax:

angular.isString(value);

Example 3: This example describes the use of the Global API that is utilized to check whether the entered value is a string or not.

HTML 
<!DOCTYPE html>
<html>

<head>
    <script src=
"https://ajax.googleapis.com/ajax/libs/angularjs/1.6.9/angular.min.js">
    </script>
</head>

<body>
    <div ng-app="App" ng-controller="Ctrl">
        <p>{{"Value is: " + i1 }}</p>
        <p>{{"Value is string: " + i2 }}</p>
    </div>
    <script>
        var app = angular.module('App', []);
        app.controller('Ctrl', function($scope) {
            $scope.i1 = 15;
          
            // checks whether the given value is a string
            $scope.i2 = angular.isString($scope.i1);
        });
    </script>
</body>
</html>

Output:

Value is: 15
Value is String: false

angular.isNumber: This is a built-in filter that is used to check whether the given value is a number or not, if it is a number then it returns true else it returns false. 

Syntax:

angular.isNumber(value);

Example 4: This example describes the use of the Global API that is utilized to check whether the given value is a number or not.

HTML 
<!DOCTYPE html>
<html>

<head>
    <script src=
"https://ajax.googleapis.com/ajax/libs/angularjs/1.6.9/angular.min.js">
    </script>
</head>

<body>
    <div ng-app="App" ng-controller="Ctrl">
        <p>{{"Value is: " + i1 }}</p>
        <p>{{"Value is string: " + i2 }}</p>
    </div>
    <script>
        var app = angular.module('App', []);
        app.controller('Ctrl', function($scope) {
            $scope.i1 = 15;
          
            // checks whether the given value is a number
            $scope.i2 = angular.isNumber($scope.i1);
        });
    </script>
</body>
</html>

Output:

Value is: 15
Value is Number: true

There are several other Global APIs, which are described below:


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