Angular Pipes

This gives Claude everything it needs to work with Angular pipes, from basic transforms to the latest Angular 21 features like standalone pipes and signal integration. You get practical examples for custom pipes, async handling with observables, and chaining. The best practices cover pure versus impure pipes (with the warning that impure ones hurt performance), the KeyValue pipe for iterating objects, and how to use inject() for dependency injection. It's comprehensive without being overwhelming, and the template syntax examples show both the new control flow and the async pipe pattern that trips people up. Good reference if you're doing any kind of data transformation or formatting in Angular templates.

skills.sh installs: 180
GitHub stars: 7
last updated: Aug 21, 2026

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Install

$ npx -y skills add oguzhan18/angular-ecosystem-skills --skill angular-pipes --agent claude-code

Installs into .claude/skills of the current project.

Files

Angular Pipes

Version: Angular 21 (2025) Tags: Pipes, Transform, Format, Async

References: Pipes Guide • API

API Changes

This section documents recent version-specific API changes.

NEW: Standalone pipes — All pipes can be standalone
NEW: Signal-based pipes — Pipes can use signals
NEW: inject() in pipes — Use functional DI in pipes
DEPRECATED: Impure pipes — Avoid for performance; use pure pipes

Best Practices

Use pure pipes for stateless transformations

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

@Pipe({
  name: 'capitalize',
  standalone: true
})
export class CapitalizePipe implements PipeTransform {
  transform(value: string): string {
    if (!value) return '';
    return value.charAt(0).toUpperCase() + value.slice(1);
  }
}

Use pipes in templates

@Component({
  template: `
    <p>{{ name | capitalize }}</p>
    <p>{{ price | currency:'USD' }}</p>
    <p>{{ items | json }}</p>
  `
})
export class MyComponent {}