Files and Folder Structure of Angular: A Comprehensive Overview

Whenever we create a new Angular project using Angular CLI, it generates a bunch of files and folders inside the project directory and each file and folder has its own purpose. So let’s see the use of some important files and folders of the Angular project which we should know about:

Let’s Start with the node_modules Folder

This is the Angular folder structure where all the third-party libraries get stored which our application might depend on and this folder is purely for development purposes, we don’t deploy this folder in the production server. So basically it contains all the dependencies.

While deploying our application in production, we exclude the node_modules folder from the deployment package as this folder is only required for development purposes.

After that, there is a src folder, this is the folder where we need to put all our application’s source code, so all the code related to our Angular application will go inside the src folder.

Inside the src folder, we have an app folder, and the app folder has a component as well as a module, as we already know that every Angular app must have at least one component and module. So basically, whenever we create any component, module or service that we create inside the app folder.

Below the app folder, we have an assets folder, in this folder, we store the static assets of our application, like images, icons, text files etc.

After that, there is an environments folder, this folder is basically used to set up different environments, in this folder we have two files, one is for the production environment and another for the development environment, so inside these files, we write environment-related configurations. We can use these files to store environment-related configurations such as database credentials of the server etc.

After that, we have the favicon.ico file, which is the icon file that displays on the browser

After that, there is an index.html file, this index.html file is the main HTML file, which gets rendered in the browser when the Angular app runs. Here we don’t have any references to the stylesheet or JavaScript files, this is because all these dependencies will be injected into this file during the build process by Angular CLI.

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Then we have the main.ts file, which is a TypeScript file and this file is basically the starting point of an Angular application, so in a lot of programming languages we have this concept of main() which is the starting point of a program and we have the same concept in Angular as well. So whenever the Angular application runs, the first file that will be executed is the main.ts file because this file is the entry point of the Angular application.

In this file, all we are doing is, we are bootstrapping the main module to the project and the main module is the app.module, so we are bootstrapping the app module to our project. So when we run the Angular application, Angular will load this module and everything else will start from there.

Then, we have the polyfills file which basically imports some scripts that are required for running Angular. This is required because the Angular framework uses features of JS that are not available in the current version of JS supported by most browsers available out there. So these polyfills fill the gap between the features of JS that Angular needs and the features supported by the current browser.

Then we have the style.css file, this is where we add global CSS style for our Angular application.

Then we have a test.ts file, this file is used for setting our testing environment.

Then, there is the .editorconfig file, this file is basically used to set up the team environment, so in a real-world project, many developers can work on a single project and each developer may follow different coding standards to declare variables, classes etc but at the end we need to merge the code of each developer in order to achieve the final product, at that time it may throw some error as each developer has their own coding standards.

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In order to solve this problem, the edit-config file is used where the standard rules are defined which need to be followed by the developer in teamwork. So, in this file, some standard rules are defined & these rules need to be followed by each developer in the team. Therefore, we define a set of instructions in this file that every developer needs to follow while coding in the application.

Then we have a .gitignore file, in this file, we can specify the files & folders which we want to exclude from our git repository.

Then we have an Angular.json file, this is one of the most important files & it contains all the configuration of our Angular project. So it contains configurations like what is the project name, what is the root folder name, what is the source folder name and other configurations.

Then we have the karma.config.js file, which is the configuration file for karma which is the test runner for JS.

Then we have a package. JSON file, which is a very important file, is a standard configuration file that every node project has. In this file, we can have all the configurations followed by dependencies & dev dependencies, inside dependencies, we can see the list of dependencies on which our project is dependent. In the same way, there is something called dev-dependencies, here all those dependencies are listed which we need for the development purpose.

The dependencies that is listed inside devDependencies, we don’t need them in production, we only need them for development purpose but for the dependencies that are listed inside the dependencies section, we need them for developing our application.

After that, we have a tsconfig.json file, this file contains a bunch of settings for our TypeScript compiler. The TypeScript compiler looks at the settings & based on these settings, it is going to compile our TypeScript code into JavaScript that the browser can understand.

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In conclusion, understanding the files and folder structure of an Angular application is essential for any developer working with this framework. Each file and folder serves a specific purpose in the development and deployment process.

By grasping the purpose and significance of each file and folder, developers can navigate and manage their projects effectively, ensuring the smooth development and deployment of Angular applications.

The proper knowledge and utilization of the files and folder structure in Angular will empower developers to build robust, maintainable, and efficient applications with ease. Happy Angular coding!

How to structure Angular project?

Structure an Angular project by using Angular CLI, organizing code into modules/components, separating services, defining routes in feature modules, and centralizing global styles/assets while ensuring code quality and documentation.

What is the node_modules folder in Angular?

The node_modules folder in Angular contains external libraries and dependencies required for the project.

How to create a folder structure in Angular?

To create a folder structure in Angular, use Angular CLI for project generation and follow a modular organization, grouping components, services, and modules by feature.

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