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What is Pipes in Angular? Built in Pipes with examples and how we can create custom pipe using angular

Hello Guys,

In this blog you're going to learn about Angular Pipes with in-built pipes and and customized pipes with details understanding.


As an Angular developer, you often come across situations where you need to transform data before displaying it to the user. For instance, you might want to format a date, display a currency in a specific format, or filter a list of items based on some criteria. This is where Angular Pipes come into the picture. Angular Pipes are built-in features that allow you to transform data easily and efficiently.


What are Angular Pipes?

Angular Pipes are a built-in feature in Angular that allow you to transform data in the template. A pipe takes in a value or values and returns a transformed value. The transformed value is then displayed in the template.

Angular Pipes are similar to filters in AngularJS. However, they are more powerful and flexible. Angular Pipes can transform data in a variety of ways, including formatting, filtering, sorting, and more.

Angular provides several built-in pipes, including the DatePipe, CurrencyPipe, DecimalPipe, and PercentPipe. You can also create your own custom pipes to meet your specific requirements.


Using Angular Pipes

Using Angular Pipes is simple. To use a pipe, you simply add it to the template expression, followed by a pipe character (|) and any necessary parameters.

For example, let's say you have a date value that you want to display in a specific format. You can use the DatePipe as follows:



Here, the DatePipe takes in the value of myDate and formats it using the 'dd/MM/yyyy' format. The transformed value is then displayed in the template.

Similarly, you can use other pipes, such as CurrencyPipe, DecimalPipe, and PercentPipe, to format numbers and currencies. For example:



Here, the CurrencyPipe formats the value of myNumber as USD currency, the DecimalPipe formats the value of myDecimal with two decimal points, and the PercentPipe formats the value of myPercent as a percentage.

Creating Custom Pipes

In addition to the built-in pipes, you can also create your own custom pipes to meet your specific requirements. To create a custom pipe, you need to implement the PipeTransform interface and define the transform method.

For example, let's say you want to create a custom pipe that capitalizes the first letter of a string. You can create a custom pipe as follows:



Here, the CapitalizePipe implements the PipeTransform interface and defines the transform method. The transform method takes in a string value and capitalizes the first letter of the string.

To use the custom pipe in your template, you simply add it to the expression, as follows:





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