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19th May, 2023

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How to Create Custom Pipes in Angular

Angular pipes are a powerful way to transform data in Angular applications. They can be used to format data, convert data types, and perform other data-related tasks.

In this blog post, we will learn how to create custom pipes in Angular 14. We will also look at some examples of custom pipes that can be used to improve the functionality of Angular applications.

Creating a Custom Pipe

To create a custom pipe, you need to create a TypeScript class that implements the PipeTransform interface. The PipeTransform interface has a single method, transform(), which takes the value to be transformed as its input and returns the transformed value.

The following code shows an example of a custom pipe that converts a string to uppercase:

TypeScript

import { Pipe, PipeTransform } from '@angular/core';

@Pipe({name: 'uppercase'})
export class UppercasePipe implements PipeTransform {

  transform(value: string): string {
    return value.toUpperCase();
  }

}

Once you have created your custom pipe, you need to register it with the Angular application. You can do this by adding the pipe to the declarations array of the AppModule class.

The following code shows how to register the UppercasePipe with the Angular application:

TypeScript

import { NgModule } from '@angular/core';
import { AppComponent } from './app.component';
import { UppercasePipe } from './pipes/uppercase.pipe';

@NgModule({
  declarations: [
    AppComponent,
    UppercasePipe
  ],
  imports: [
    BrowserModule
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

Using a Custom Pipe in a Template

Once you have registered your custom pipe with the Angular application, you can use it in a template. To do this, you need to use the pipe name followed by the value to be transformed.

The following code shows how to use the UppercasePipe in a template:

HTML

<h1>{{title | uppercase}}</h1>

This code will display the title of the application in uppercase letters.

Examples of Custom Pipes

Here are some examples of custom pipes that can be used to improve the functionality of Angular applications:

A pipe that converts a date to a human-readable format.
A pipe that converts a number to a currency format.
A pipe that converts a string to a boolean value.
A pipe that filters an array of objects.
A pipe that sorts an array of objects.

These are just a few examples of the many custom pipes that can be created. By creating custom pipes, you can extend the functionality of Angular applications and make them more powerful and user-friendly.

Conclusion

In this blog post, we have learned how to create custom pipes in Angular 14. We have also looked at some examples of custom pipes that can be used to improve the functionality of Angular applications.

I hope this blog post has been helpful. If you have any questions, please feel free to leave a comment below.

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