`inject()`

Retrieves a dependency from the current injector without constructor params.

Since Angular 14+ Spec ↗

Syntax

inject<T>(token: ProviderToken<T>, options?): T

Parameters

Name	Type	Required	Description
`token`	`ProviderToken<T>`	No	The class or InjectionToken to resolve.
`options`	`object`	No	Supports optional, self, skipSelf, host.

Returns

T — The resolved dependency instance.

Throws

NullInjectorError — When no provider is found and optional is not set.

Examples

import { Component, inject } from '@angular/core';
import { HttpClient } from '@angular/common/http';

@Component({ selector: 'app-data', standalone: true, template: '' })
export class DataComponent {
  private http = inject(HttpClient);
  load() {
    return this.http.get('/api/items');
  }
}

Notes

Call inject() within an injection context: constructors, field initializers, or factory functions. It is the preferred modern alternative to constructor injection and works well with inheritance and functional guards/resolvers. Pass `{ optional: true }` to allow a null result.