How to Migrating an AngularJS App to Angular

Hello everyone! Today’s discussion may appear very simple at the first glance but may be sure that it is not!

Migrating an AngularJS App to Angular: How can you do that?

I would like to start with the issue that nowadays developers have been creating incredibly contemporary progressive, amusing, useful, and interesting apps that stand out and gain an enormous number of users. As a consequence, it’s definitely obvious that if you are crazy about attracting more attention it is necessary to be the number one on the range of the developers, that’s why you should all the time get acquainted with something new, always fall in with the latest news in the sphere of developing and try to operate with exceptionally latest categories of computer programs. It is considered that the sphere of IT has been progressing over the years, so to stay in that range you have to do something.

If you are longing to find out incredibly helpful and interesting details and want to be aware of really useful information about migrating an AngularJS App to Angular, then this article is obviously for you.

Major reasons that made you think about the Angular Migration?

There are some answers to this question:

Why? An excellent example may be related to the working process. During the work you can face the problem with really slow request processing. Moreover, the errors in the codes often occur.

Who is responsible for the migration?

It all depends on the factor of how complicated your apps are. You can perform that process on your own or hire a professional developer, who definitely knows what to do. You may consult with him in order to get some recommendations or you can pay him for the work he will be going to do.

In case, you have finally decided to update your program, bring it to a better level, improve its functioning, interface and tools. If you want to feel the speed of quick features, the next step should be to choose the program to which you want to make the transition. There are some versions of Angular, let’s move on to them:


It is a useful framework for developing apps. It allows you to utilize HTML as your sample language and gives you an opportunity to enlarge the syntax and put your application’s elements briefly and shortly.


It has provided huge changes to the preliminary framework because it was designed in TypeScript. Its benefits are:

  • Because of the availability of a TypeScript it boosts the codes.
  • This can easily maintain the phone apps.
  • Accessibility of various languages.

Talking about the drawbacks, they are:

  • It is so difficult to personalize in relation to AngularJS.
  • Small and uncomplicated web apps.

Angular 4

As for its benefits:

  • By providing templates, it enhances fast application development.
  • It matches in the process of the development of an one page app.
  • You can write and check codes without any effort.

As for disadvantages it is only because of utilizing a huge amount of data, it can just work so slowly in some periods of time.

By considering the Angular 5 we are able to integrate it with the next version, in spite of they are somehow joined to each other. Their own goal is concentrated on at the developing CLI. Thanks for and with the aid of CLI it lets us easily generate an app very quickly and very well and allows you to stay peaceful so that it will counter your needs.

Now there can be found a huge range of f advantages of utilizing the CLI. First of all, it becomes for you a special tool with the help of which you can easily add features, and different peculiarities for creating an app. The major idea is that you are able to save your valuable time by not writing the topics but just utilize Angular coding guideline

In Angular 7 the advancement of CLI has continued to improve, so that you can explore the framework even on intuitional level. Moreover, due to the improvements the code-shortage has significantly increased in its size.

Furthermore, we can examine great changes in Angular 8. It stands out because only in the eighth version two new functions have just started out such as ivy renderer and bazel for building interfaces. Another also good improvement in handholding of outdated browsers this is manifested in quick uploading of browser’s content and files.

And the last but not the least version, Angular 9 was introduced in 2020. Taking into consideration early previous advancements, it has also its own changes. Like in the eight, it has significantly developed ivy; huge changes came with the platform, appearance, framework and CLI. Also, it has designed a new way to connect codes with the help of new methods.

So once you’ve determined which version you’d like to measure up to, you can decide which tools to use in order to migrate from AngularJS to Angular successfully and easily.

So, how to do that?

Overall, there are 4 ways how can you proceed to the migration from AngularJS to Angular:

  • Rewriting

It is obvious by its name, so it means that you have to rewrite the whole code. It is very obligatory for the old apps and the outmoded program files, so the rewriting will bring them back to life. Establishing from the very beginning, you are able to overthink all features of your program and start creating something fresh and new.

On the other hand, a huge disadvantage is also here. If you rewrite the whole app, it takes a lot of time. The major problem lies in that you have to work with the programs simultaneously, to be honest it is really hard, and if you want to do it on your own, it may be very difficult.

  • Using ngAssistant program

The main feature is that it is oriented on analyses and really comfortable in its use. It works along with the program that you obviously have installed the Angular Command Line Interface. Providing that you utilize the ngMigration Assistant, which observes AngularJS and creates the instructions to you on how to migrate, you can follow the commands you get and use it for any size of the application. So to begin the process of the migration wouldn’t seem so complex. If you have installed the program, you can observe how to use it, and get the general guidance.

In addition there is the ngMigration Forum, which is in charge of the availability of expert’s counseling. Due to that fact you have the great possibility to get acquainted with the information about the latest changes and transformations of operations with Angular. Moreover, by using their advice you may come to your own conclusion and find through which ways you will perform such tasks.

  • Migrating by ngUpgrade

Thanks to that tool you can easily maintain the working process of two programs. While combining AngularJS and Angular apps, so to handle them simultaneously the ngUpgrade is the greatest program appropriate for it. It lets you produce the moving in bits since the various frameworks work jointly. NgUpgrade has a module that assists you to launch and optimize your app. It provides you to slowly migrate from one to another, in addition, such kinds of migration can continue for a great period of time; it all depends on your preferences and requirements. Also, ngUpgrade lets Angular and AngularJS coexist and run together without interrupting the application.

  • Angular Elements

There are packages in Angular that permits you to modify and convert Angular elements into self-elements obviously understood by browsers. Angular Elements get rid of the importance of ngUpgrade; nevertheless, they are useful only for very large and complicated applications.


All in all, you can make a decision, if you have really decided to migrate from AngularJS to Angular, you should precede all problems that appear on your way. After that, you have to decide which version will be the most appropriate and may meet your demands. And the last is to decide in which way you will perform the migration. To my mind, if you are a professional you can ever try to rewrite the program. On the other hand, if you are a beginner or not confident in your action, you can choose easier ways. Altogether, it is really interesting and useful because in any case, you are able to gain new experience and enlarge your knowledge!

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