Top 12 Angular Best Practices to Improve your Angular Code

Nimisha Kapadia July 20, 2021

Angular Development Best Practices

Quick Summary: For Angular or any other framework, maintaining your code is very important. It directly affects the output. When developers focus on the dos and don’t s of coding practices, they can develop the best application.

In this article – we will discuss Angular best practices to improve your Angular app performance instantly. This blog will be helpful to you to understand and discuss various best practices for a scalable framework like Angular.

Google developed Angular as a rewrite of Angular, which is the most powerful framework for developing front-end applications.  Its subsequent versions are Angular 2 and onward.

Google released Angular in 2010. Modules, components, metadata, templates, data binding, services, directives, and dependency injection are the main building blocks of Angular.

Today, over 40% of front-end developers are using Angular. Because of its widespread popularity, we thought it would be a productive activity to high spot a few Angular best practices with you.

Without further delay, let’s list some of the Angular best practices we are following to build web applications.

Table of Contents:

      1. Using Angular CLI 
      2. Angular Routing Best Practices
      3. Module Structure for Clean Application Structure
      4. Angular Coding Practices for Organized Coding Structure
      5. Angular Coding Standards
      6. Defining a Highly Scalable Folder Structure for Angular
      7. Using Lazy Load Feature Module for Reducing Initial Load Time
      8. Smart vs. Dumb Components: Understanding the Difference
      9. Angular State Management Best practice: Utilize Central State Management (Redux/Ngrx)
      10. Single Responsibility Principle
      11. Prevent Memory Leaks
      12. Security Best Practices in Angular apps
      13. Use of Async Pipes for Saving the Memory Bytes
      14. Use of Service Workers for the Responsive App

Angular Best Practices you can follow to organize your Angular project

Angular Best Practices

 

The search to find an acceptable frontend framework is solved by observing some crucial points regarding user experience and understanding the project’s needs. But after you consider bringing the most effectiveness out of any one of them, you’ll surely need to follow the best methods and practices.

When you think about a generalized architecture of an Angular app, it conveys completely different components in a hierarchy of grand, parent, and child elements inside a ngModule.

The whole method of communication between end-users and backend developers ought to be clear and understood. It is finished with the correct understanding and management of approaches that are best appropriate and organized with past experiences.

And therefore, I’m sharing some suggestions and what works best in Angular apps in the discussion below.

Here are some of the Angular best practices that have been tried, tested, and have worked wonders for our team. Here you go!

Using Angular CLI in the Application

Angular Command-Line Interface (CLI) helps you create, test, scaffold, and deploy the application. It establishes a workspace folder and creates a structure for the web app.

The primary purpose of this is to reduce JavaScript weakness and customize the application development environment.

You can use the Angular CLI tool to create an initial-level structure for the application. You can additionally find multiple modules in one place whereas still adding a variety of modules and features at any time.

More importantly, the most significant benefit of using Angular CLI in your development environment is that you can add new developers to the team at any point without any setbacks.

It’d be a lot easier for them to understand the folder structure and app flow using Angular CLI. Ultimately, it saves your time when it comes to explaining the project to your extended team.

So instead of manually creating the files and folders, use Angular CLI to generate new components, directives, modules, services, and pipes.

# Install Angular CLI
  npm install -g @angular/cli

# Check Angular CLI version
  ng version

 

Routing Best Practices of the Angular

The Angular router is a fundamental part of your Angular platform. It allows developers to build Single Page Applications with multiple views and enable navigation between these views.

The purpose of routing is to hide or display components as and when the user might need them. It removes frequent trips to the server by making components available upon requirement.

This idea of routing different paths in Angular applications turns around understanding the basics.

First, developers ought to understand the basic concept of adding components and templates into the app, followed by the correct functioning of routes.

The best practices in routing are

  • Creating module wise routes
  • Routing with lazy loading
  • Lazy loading routes with Preload
  • Organizing routes guards

For more details, explore this blog post on Routing Fundamentals and Configurations in Angular.

Module Development for Clean Application Structure

Angular applications are meant to be super speedy. An enterprise-grade app comprises multiple modules with different functionalities. And the modularization of the application mentions dividing an application into several parts.

For example, large applications like Facebook or massive content sites only contain a few crucial routes in the app component -root component. At the same time, other modules are separated according to the functionalities.

It is beneficial in initial loading time. In addition, it organizes the entire coding structure module-wise, which makes it easier for coders to understand the code.

This practice makes lazy loading possible most significantly by allowing loadChildren property to app modules that define the routes. It makes the concept of lazy loading all-purpose and connects to minimize the load time and increase user engagement.

Here’s an example:

const routes: Routes = [ {
path: 'items',
loadChildren: () => import('./items/items.module').then(m => m.ItemsModule)
} ]; 

 

Using Clean-Code Practice to Easily Locate Files & Code Structures

Angular has progressed to become one of the most demanding frameworks in JavaScript-based web applications. It has quite a lot of out-of-the-box features that help in building web apps with clean-code architecture.

Clean-code practice includes:

  •  Using Angular CLI.
  •  Coding style guide.
  •  Writing readable code.
  •  Practicing organized folder structure in your angular app.

This practice involves keeping the code readable at most places, having a clean code structure for effortless management and maintenance, writing small functions, and maintaining reliable and related naming to the file names.

Coding standards are the traditions of programming software. For example, in your Angular applications, the developers can follow certain coding styles for the best user experience. It improves the understandability, readability, simplicity, and adaptability of your project.

Programming without any coding standards results in complex code structures and makes it very difficult for developers to fix bugs and reflect on immediate issues.

Angular Project structure

A simple but important thing we should follow is Creating an Angular Project structure. It gives a clear idea of all the components that exist in your application.

You can have trouble managing the whole application if you have not correctly structured your project.

Either the size of the project is medium or large, you should always try to have the habit of structuring your project.

Following consistent Angular coding styles

Here are some best coding practices you should follow to develop your Angular application with the proper coding standard.

  • Limit files to have code Lines within 400.
  • Define small functions and limit them to have code lines, not more than 75. All symbols have consistent names. The suggested pattern is feature.type.ts. Use ‘const’ if the values of the variables are constant throughout the file.
  • To separate words in the descriptive names, use dashes. Use dots to separate names from the type.
  • Function names should be meaningful, and names of properties and methods should always be in lower camel case.
  • Always have a habit of leaving one empty line between imports and modules, such as third party and application imports and third-party modules and custom modules.
  • Use a custom prefix for different slider components.

Defining an Extremely Scalable Folder Structure for Angular

Among all mentioned best practices, creating a folder structure is a critical factor that you should consider before initiating your project. If you haven’t structured the folder properly, there will be a high chance of inviting many problems haunting you throughout your application development.

Whether your project is medium or large-sized, you will come across many changes in the middle of development, and your project should speedily adapt to the new changes made in the middle of the action. And that is possible only when you have created a proper folder in place.

If you aim to build a scalable angular app , defining a highly scalable folder structure is recommended. Developers should practice shared-module concepts to increase code re-usability since it ultimately saves development time and cost and increases the performance of your angular project.

Lazy Loading Feature Module for Reducing Initial Load Time

Lazy Loading Module is one of the best practices offered by Angular. This feature module tells your application to work on the user demand.

It mainly works to decrease start-up time, which results in the easy loading of the application. Thus, the lazy load module in Angular helps developers to load the thing on demand.

For example, when you use it, it loads the components and other things you need and stops other unnecessary files from getting loaded.

Have a look at the following example of the lazy-loading feature module using the loadChildren property:

import {Routes} from '@angular/router';

// StoreComponent is a normal, eager loaded component

import { StoreComponent } from './Store/Store.component';
export const routes: Routes = [
{ path: '', component: StoreComponent, pathMatch: 'full'},
{ path: 'shop', loadChildren: () => import('./shop/shop.module').then(m => m.ShopModule)}; 

Smart vs Dumb Components: Understand the Difference

Smart vs Dumb Components

The title may not sound kind enough. In essence, the idea is like this. For any specific feature/page, you may have a smart one and several dumb components in your app.

Smart components do the functionalities like manipulating data, calling the APIs, focusing more on functionalities, and managing states. While dumb components are all about cosmetics: they focus more on how they look.

The smart component takes care of many “logical” stuff and passes enough data to dumb components to present. Smart components focus on functionality like how things work, whereas dumb components are UI concentrated and more reusable.

For example, Let’s have a website with a simple login process that contains an input form and login-in function for the users– The login form has input boxes and buttons.

The dumb components handle the look (UI) of the buttons and text boxes. The smart components run these buttons’ functionality, i.e., after clicking on the submit button, they check user login info and do the login process.

It is critical to decide and structure these components and minor details behind them in any scalable Angular project, but categorizing helps you create more intelligible Angular apps effortlessly, and it also improves user experience.

Angular State Management Best practice: Utilize Central State Management (Redux/Ngrx)

 

Angular Routing Best Practices

When you are dealing with small and medium-sized Angular applications, State management is manageable, but as the size grows, the process becomes pretty complicated and hectic.

It would be best if you had smooth communication between components which have their local states. For that purpose, you need to follow Angular State management best practices, i.e., utilizing central state management. Yeah! You might be thinking about what central state management is?

So, the answer is – Having all the states of the components in one place is Central State Management. There is no need to divide states among various small components unless there is a requirement for it. By doing these, it makes communication between components very easy.

Various state management libraries are available, such as NGRX, NGXS, Akita, etc., with different usages, states, and purposes.

NGXS could be the preferred one for all of them as most developers have referred to this as the most usable and straightforward tool to learn.

Advantages of using Central State Management

  • Manages all states in one place, so there is no need to search the component tree.
  • Transfer of data easy is also effortless
  • When the application has a centralized state, communication between components, the main issue is solved.
  • It reduces debugging time.

Two great choices for centralizing your Angular State Management

Redux and Ngrx:

The answer to which one you must prefer altogether depends on your project’s demand, application size, project structure, and technology stack.

If you are managing massive applications where you have got some of the components to handle, then redux is the best for you.

But, if you are running small or medium-sized applications, Redux should be prevented. Considering Redux for such applications will indeed cause performance problems and more complicates the code.

Single Responsibility Principle

It is essential not to create more than one component, service, or directive within a single file. Each file should be responsible for a single functionality. By doing this, we are keeping our files clean, readable, and maintainable.

Prevent Memory Leaks

Observable Memory Leaks are generally detected in almost all frameworks and libraries. Angular additionally has a similar issue—angular Observable in the mainstream actual data. If you are not focused enough, there will be full chances of memory leaks.

Memory Leaks are one of the damaging and straightforward issues attacking the application’s security.

Here are some ways suggested that you can use to secure your application:

– Utilizing async pipes

You can use async pipes and guarantee to stop memory leaks. You must attempt your best to avoid subscribing to observables then binding them with the component.

So, the conclusion is that if the observable technique is not entirely done, the probabilities of memory leaks are possible.

– Using take(1)

Angular take(1) is an operator. It takes the {value} and lets it not subscribe each time a replacement value is diagnosed. It takes care that you receive data just once. It prevents the leakage of memory with efficiency.

info$.pipe(take(1)).subscribe((response)=>console.log(response))

– Use of takeUntil

takeUntil is also the operator. It allows viewing the Observable and gets free from the subscriptions once Observable produces the value.  We can conclude that it will secure the Observable from getting leaked.

Security Best Practices in Angular apps

The most vulnerable part of your web application could be the security.

The web applications have proven to be helpless to attacks from different sources, though it is our responsibility to safeguard our data and the code.

So how does Angular handle security?

Well, cross-site scripting (XSS) is one most necessary reason your client-side platform needs protection. These kinds of scripting attacks can pass on to the controls of a page on the client-side, and it will change the web pages that the users view.

On the other hand, some built-in features can prevent these attacks that the angular framework offers.

Since there’s no assurance that attackers won’t pass malicious code through the property, attribute, or any provided value, Angular considers all the values untrusted by default.

Hence, while using this protective characteristic of Angular, coders should be aware of specific tasks that the framework executes.

  • Regular Maintenance of Angular Libraries – Stay updated with the latest Angular library
  • Prevention of XSS cross-site security threats 
  • Sanitization and security contexts
  • DOM sanitization service
  • Context security policy
  • Offline template compiler
  • Block HTTP-related vulnerabilities
  • Avoid risky Angular APIs
  • Don’t customize Angular files

The security measures mentioned above are required to keep attackers from feeding in wrong data values to the client-side and sanitizing DOMs, thus developing Angular client-side applications with more vital protection.

Google’s core Angular team keeps their libraries updated with the latest security issues and bug fixes for a safe frontend connection. So, whenever Google releases a new update, the libraries need to be updated every time.

Use Async Pipes for Saving the Memory Bytes

Angular comes prepared with various built-in pipes. These attributes are advantageous in tuning the output of any number of inputs provided to it.

Fundamentally, they support the concept of any web application, i.e., receiving inputs and processing the data, and changing them into a required output.

Developers should use these features in the code for re-usability purposes. They can simplify code architecture by separating complex mathematical processes.

Async Pipes are built-in attributes. They save you an overload of memory bytes when you develop a large-scale application visited by many users. They subscribe to the observable and display the value it has omitted.

Hence, they come in convenient while marking the components for emitted values and automatically unsubscribing from the observable to control the unnecessary memory leakages.

As shown in the example below:

alert (@Component ({  selector: 'async-observable-pipe',
template: ' observable|async: Time: {{time | async}}
 
‘}) export class AsyncObservablePipeComponent {   time = new Observable((observer: Observer) => { setInterval(() =>observer.next(new Date().toString()), 1000);   }); } )

 

Use of Service Workers for the Responsive App

We already know that Angular makes user interactions easy. It makes it possible by converting traditional web apps into single page applications, adding responsiveness, and creating interactive web applications.

Service workforce makes it more accessible for users to cooperate with web applications.

Service workers make it even easier for users to interact with web apps. We can convert our single page application into progressive web apps (PWA) by adding native features to them. You can use service workers with any version of the Angular framework above five.

Service workers work as a network proxy. They increase/enhance the user experience by allowing users to access and interact with native features of a web application without waiting for internet connectivity.

So, what are the Service Workers for apps?

  • Offers native app experience, entirely caches the version on refreshing the web pages
  • Loads newest cached code in the further tabs
  • Downloads the resources only upon the edited contents
  • Serves the previous version of the application until the stable version is being served

 

Conclusion

Proper attention is necessary if you desire to make your app popular and delightful. You need to update your knowledge regularly.

Applying these Angular best practices will help you to make your development smooth and help you create an impressive application.

Besides, the practices explained here are not the end. There is more out there, which we need to learn through real life projects. You are most welcome to share with us your thoughts and doubts on the  CONTACT US page.