State Management with NGRX in Angular Applications

In the complex ecosystem of modern web applications, managing state efficiently and predictably is crucial. For Angular applications, NGRX offers an excellent solution for state management, adhering to the Redux pattern. This article will explore how NGRX can be utilized to handle application state, enhancing predictability and maintainability. We'll delve into the core concepts of NGRX, including actions, reducers, and effects, and provide practical code examples to demonstrate their implementation.

Understanding NGRX

NGRX is a state management library that follows the Redux pattern, designed specifically for Angular applications. It provides a single, immutable state container that makes state changes predictable and transparent.

Setting Up NGRX in an Angular Application

First, let’s set up NGRX in an Angular project. NGRX can be added via Angular CLI by running ng add @ngrx/store. This command sets up the necessary NGRX modules in your application.

Defining Actions

Actions in NGRX are the sources of information for the store. They express unique events that can change the state.

// counter.actions.ts
import { createAction } from '@ngrx/store';

export const increment = createAction('[Counter Component] Increment');
export const decrement = createAction('[Counter Component] Decrement');

Creating Reducers

Reducers in NGRX are pure functions that take the current state and an action and return a new state. They handle how the state changes in response to actions.

// counter.reducer.ts
import { createReducer, on } from '@ngrx/store';
import * as CounterActions from './counter.actions';

export const initialState = 0;

const _counterReducer = createReducer(
  on(CounterActions.increment, state => state + 1),
  on(CounterActions.decrement, state => state - 1)

export function counterReducer(state, action) {
  return _counterReducer(state, action);

Managing Side Effects with Effects

Effects in NGRX handle side effects of actions in your application. They provide a way to interact with external resources or asynchronous operations.

// counter.effects.ts
import { Injectable } from '@angular/core';
import { Actions, ofType, createEffect } from '@ngrx/effects';
import { of } from 'rxjs';
import { switchMap } from 'rxjs/operators';
import * as CounterActions from './counter.actions';

export class CounterEffects {
  loadCounter$ = createEffect(() => this.actions$.pipe(
    switchMap(() => {
      // Handle the side effect and return a new action
      return of(/* New Action */);

  constructor(private actions$: Actions) {}

Benefits of Using NGRX

  1. Predictability: With NGRX, the state changes are predictable and consistent, making debugging and testing easier.
  2. Maintainability: NGRX’s structured approach to state management makes Angular applications more maintainable and scalable.
  3. Performance: NGRX’s use of observables and immutability ensures optimal performance even for complex applications.


The adoption of NGRX for state management in Angular applications represents a significant paradigm shift towards more structured, predictable, and efficient handling of application state. NGRX’s adherence to the Redux pattern brings a level of discipline and clarity to state changes that is invaluable in large-scale and complex applications. Through the use of actions, reducers, and effects, NGRX provides a comprehensive framework for managing state that is both scalable and maintainable.

The benefits of using NGRX in Angular applications extend beyond just predictability and efficiency. The structured approach to state management with NGRX enhances the overall maintainability of applications, making it easier for development teams to collaborate and manage large codebases. This is particularly beneficial in enterprise-level applications where different teams may be working on various features simultaneously. Moreover, the performance optimizations inherent in NGRX, such as minimizing unnecessary renders and efficient state updates, contribute to smoother and faster application experiences, which are crucial in today’s user-centric digital world.

In summary, the integration of NGRX in Angular applications is more than a technical implementation; it is a strategic approach to building robust, high-performing web applications. At Mazooma, our commitment to leveraging advanced technologies like NGRX underscores our dedication to delivering not just functional but also highly optimized and user-friendly applications. By harnessing the power of NGRX, we are able to offer our clients software solutions that are not just in line with current best practices but also future-ready, ensuring they stay ahead in the competitive landscape of digital technology.

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