Learn how to easily launch your Angular app on localhost with step-by-step examples.

Table of content

  1. Introduction
  2. Prerequisites
  3. Installing Angular CLI
  4. Building a new Angular project
  5. Running the Angular app on localhost
  6. Debugging the Angular app on localhost
  7. Troubleshooting common errors
  8. Conclusion



Launching an Angular app on a localhost is an essential step in the development process. It allows you to test your app for functionality and visual design before deploying it on a live server. Whether you're new to Angular or an experienced developer, learning how to launch an Angular app on a localhost is a valuable skill to have. In this guide, we'll walk you through the process of launching your Angular app on a localhost, step-by-step. By the end of this guide, you'll have a clear understanding of how to test your app on a localhost, and you'll be able to do it with ease. Let's get started!

To launch your Angular app on a localhost, you'll need to have some basic knowledge of Angular and its requirements. Here are some key concepts to keep in mind before we dive into the step-by-step guide:

  • Angular requires Node.js and the Angular CLI (Command Line Interface) to be installed on your machine.
  • Your Angular app must be created using the Angular CLI. If you've created your app using a different method, you'll need to migrate it to the Angular CLI.
  • The Angular CLI provides a development server that you can use to test your app on a localhost.
  • The development server runs on port 4200 by default. You can change the port number if you need to.

With these concepts in mind, let's move on to the first step in launching your Angular app on a localhost.


Before we dive into launching your Angular app on localhost, there are a few you’ll need to have in place:

  • Node.js: Node.js is an open-source, cross-platform JavaScript runtime environment which will allow you to execute our server-side code. You can download it from the official Node.js website.

  • Angular CLI: The Angular CLI is a command-line interface tool that allows you to create, customize, and build Angular apps. You can install it by running the following command in your terminal:

npm install -g @angular/cli

  • A Text Editor: A text editor is a software tool that allows you to write and edit code. Some popular text editors include VS Code, Sublime Text, and Notepad++.

  • An understanding of the basics of Angular: In order to launch your app on localhost using Angular, you’ll need to have some basic understanding of Angular concepts such as component, module, and dependency injection.

By having these in place, you will be able to follow along with the examples and launch your Angular app on localhost with ease. If you’re new to any of these , don’t worry, we’ll explain everything in detail throughout this guide.

Installing Angular CLI

Before we can launch our Angular application, we must first install Angular CLI. Here's how to do it:

  1. Open your terminal or command prompt.
  2. Type npm install -g @angular/cli and hit enter. This installs Angular CLI globally on your computer.
  3. Wait for the installation to complete. This may take a few minutes.

Once Angular CLI is installed, you're ready to create a new Angular project or work on an existing one. To create a new Angular project, simply type ng new project-name in your terminal and hit enter. This will create a new folder with the name of your project and generate all the necessary files and dependencies.

With Angular CLI, you can easily manage your Angular applications, add new components, services, and modules, and run your application locally or deploy it to a server. The CLI provides a seamless way to streamline the development process and make things easier for developers.

In summary, to launch an Angular app on localhost, you must first install Angular CLI. This can be done by running the npm install -g @angular/cli command in your terminal. Once you've installed Angular CLI, you're ready to create new Angular projects and start building your application.

Building a new Angular project

Before we can launch an Angular app on localhost, we need to build the app. Here are the steps to build a new Angular project:

  1. Install Node.js and npm (Node Package Manager) on your computer.
  2. Open your terminal or command prompt.
  3. Run the following command to install Angular CLI (Command Line Interface):
npm install -g @angular/cli
  1. Create a new Angular project with the following command:
ng new my-app
  1. Navigate to the project folder with the following command:
cd my-app
  1. Serve the app on localhost with the following command:
ng serve

The ng serve command compiles the app and launches it on a development server at http://localhost:4200/. You should see a message in your terminal indicating that the app is running.

Congratulations, you have successfully built your first Angular app! In the next section, we will explore how to launch the app on localhost.

Running the Angular app on localhost

Once you've created your Angular app, it's time to run it on localhost. This allows you to test your app's functionality without actually deploying it to a web server.

To run your Angular app on localhost, follow these steps:

  1. Open your terminal and navigate to your project directory.
  2. Type ng serve and hit enter. This will compile your app and start a local web server at http://localhost:4200.
  3. Open your web browser and navigate to http://localhost:4200. Your app should now be running on localhost!

Additional Notes

Here are a few additional notes to keep in mind when running your Angular app on localhost:

  • You can specify a different port number by adding the --port flag followed by your desired port number. For example, ng serve --port 3000 will start the server at http://localhost:3000.
  • You can also use the --open flag to automatically open your app in a web browser after it's compiled. For example, ng serve --open will compile your app and open it in your default web browser.
  • If you make changes to your code, the server will automatically recompile your app and refresh the webpage in your browser. This makes it easy to test your app as you develop it.

    Debugging the Angular app on localhost

When developing an Angular app on localhost, it's always a good idea to test and debug your app before deploying it to a production environment. Debugging your app on localhost can help you catch errors and fix bugs before they become bigger problems in production.

Here are some steps to help you debug your Angular app on localhost:

  1. Debugging with the browser developer tools. Most modern browsers, such as Chrome and Firefox, come with developer tools that allow you to inspect the code and debug your Angular app. You can use these tools to view the console log, check for errors, and inspect the HTML and CSS to identify any issues.

  2. Debugging with Angular CLI. If you've created your Angular app using Angular CLI, you can use its built-in debugging tools to test and debug your app. You can use the ng serve command to run your app on localhost, and then use the --source-map flag to generate source maps for better debugging.

  3. Debugging with Visual Studio Code. Visual Studio Code is a popular code editor that provides excellent debugging support for Angular apps. You can use the built-in debugger to step through your code, set breakpoints, and inspect variables and expressions.

  4. Testing with unit tests. Unit tests are an essential part of Angular development, and they can help you catch bugs and errors early. You can run unit tests on your Angular app using tools such as Karma and Jasmine.

By following these steps, you can ensure that your Angular app is free from errors and bugs before it goes live. Debugging your app on localhost can save you a lot of time and effort in the long run, so it's always worth taking the time to do it properly.

Troubleshooting common errors

As with any development project, errors can arise when launching an Angular app on localhost. Some of the most common errors and their solutions are:

Port already in use error:

This error message indicates that the port number you are using to run your Angular app is already occupied by another process. To fix this error, change the port number in the angular.json configuration file.

CORS error:

CORS (Cross-Origin Resource Sharing) errors occur when an Angular app running on localhost tries to access a resource from a different origin. To fix this error, you can add a proxy configuration that enables your app to access external resources.

Missing dependencies error:

This error occurs when your Angular app is missing a required dependency. To fix this error, reinstall the missing dependency using the npm install command.

Compilation errors:

Compilation errors can occur if there are syntax errors or other issues in the code. To fix this error, review the code and check for syntax errors or undefined variables.

Network connectivity issues:

If you are unable to access your Angular app on localhost, check your network connectivity settings. Ensure that your computer is connected to the internet and that your firewall settings allow connections to the port on which your app is running.

By addressing the common errors that can arise when launching an Angular app on localhost, you can save time and focus your efforts on developing your app. Remember to regularly test your app on localhost to catch errors early on in the development process.


Congratulations on learning how to easily launch your Angular app on localhost! We hope that this guide has been helpful in getting you started with the process.


  • Angular apps run on a local server, which you can start using the "ng serve" command in the Terminal.
  • By default, your app will be accessible at "http://localhost:4200".
  • You may encounter issues with CORS or port number conflicts, which can be resolved using a proxy configuration or by specifying a different port number.

Don't forget to test your app thoroughly and consult the official Angular documentation if you need further assistance with deployment or troubleshooting. By following these steps, you'll be well on your way to launching your Angular app on localhost with ease. Good luck!

Cloud Computing and DevOps Engineering have always been my driving passions, energizing me with enthusiasm and a desire to stay at the forefront of technological innovation. I take great pleasure in innovating and devising workarounds for complex problems. Drawing on over 8 years of professional experience in the IT industry, with a focus on Cloud Computing and DevOps Engineering, I have a track record of success in designing and implementing complex infrastructure projects from diverse perspectives, and devising strategies that have significantly increased revenue. I am currently seeking a challenging position where I can leverage my competencies in a professional manner that maximizes productivity and exceeds expectations.
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