Angular

Angular is a popular framework for building cross-platform applications. IntelliJ IDEA provides support for Angular and helps you on every step of the development process – from creating a new Angular app and working on the components to debugging and testing it.

Before you start

Download and install Node.js.
Make sure the JavaScript and TypeScript and Angular and AngularJS required plugins are enabled on the Settings | Plugins page, tab Installed. For more information, refer to Managing plugins.

Create a new Angular application

The recommended way to start building a new Angular application is Angular CLI, which IntelliJ IDEA downloads and runs for you using npx. As a result, your application is bootstrapped with a ready-to-use TypeScript and Webpack configuration.

Of course, you can download Angular CLI yourself or create an empty IntelliJ IDEA project and install Angular in it.

Select File | New | Project from the main menu or click the New Project button on the Welcome screen.
In the left-hand pane, choose Angular CLI.
Specify the project name and the folder to create it in. In the Node Interpreter field, specify the Node.js interpreter to use. Select a configured interpreter from the list or choose Add to configure a new one.
From the Angular CLI list, select npx --package @angular/cli ng.
Alternatively, for npm version 5.1 and earlier, install the @angular/cli package yourself by running npm install -g @angular/cli in the Terminal Alt+F12. When creating an application, select the folder where the @angular/cli package is stored.
Optionally:
- In the Additional parameters field, specify the extra ng new options to pass to Angular CLI. Code completion is available in this field: as you start typing the name of an option or press Ctrl+Space, IntelliJ IDEA shows you the available options and their description.
- If you are using Angular version 16 or later, you can also select the Create new project with standalone components checkbox. Learn more from the Angular official website.
When you click Create, IntelliJ IDEA generates an Angular-specific project with all the required configuration files and downloads all the necessary dependencies.

Create an empty IntelliJ IDEA project

Select File | New | Project from the main menu or click the New Project button on the Welcome screen.
In the New Project dialog, select New Project in the left-hand pane.
In the right-hand pane, select JavaScript in the Language area.
Name the new project and change its location if necessary, then click Create.
When you click Create, IntelliJ IDEA creates and opens an empty project.

Install Angular in an empty project

Open the empty project where you will use Angular.
In the embedded Terminal (Alt+F12) , type:
npm install @angular/core
That will install the core Angular package with the critical runtime parts of the framework.

You may also need to install other packages that are parts of Angular, refer to the list of packages.

Start with an existing Angular application

To continue developing an existing Angular application, open it in IntelliJ IDEA and download the required dependencies.

Open the application sources that are already on your machine

Click Open or Import on the Welcome screen or select File | Open from the main menu. In the dialog that opens, select the folder where your sources are stored.

Check out the application sources from your version control

Click Get from VCS on the Welcome screen.
Alternatively, select File | New | Project from Version Control or Git | Clone or VCS | Get from Version Control from the main menu.
Instead of Git in the main menu, you may see any other Version Control System that is associated with your project. For example, Mercurial or Perforce.
In the dialog that opens, select your version control system from the list and specify the repository to check out the application sources from. For more information, refer to Check out a project (clone).

Download the dependencies

Click Run 'npm install' or Run 'yarn install' in the popup:
You can use npm, Yarn 1, or Yarn 2, refer to npm and Yarn for details.
Alternatively, select Run 'npm install' or Run 'yarn install' from the context menu of package.json in the editor or in the Project tool window.

Project security

When you open a project that was created outside IntelliJ IDEA and was imported into it, IntelliJ IDEA displays a dialog where you can decide how to handle this project with unfamiliar source code.

Select one of the following options:

Preview in Safe Mode: in this case, IntelliJ IDEA opens the project in a preview mode. It means that you can browse the project's sources but you cannot run tasks and script or run/debug your project.
IntelliJ IDEA displays a notification on top of the editor area, and you can click the Trust project link and load your project at any time.
Trust Project: in this case, IntelliJ IDEA opens and loads a project. That means the project is initialized, project's plugins are resolved, dependencies are added, and all IntelliJ IDEA features are available.
Don't Open: in this case, IntelliJ IDEA doesn't open the project.

Learn more from Project security.

Write and edit your code

This chapter provides Angular-specific hints. For general guidelines, refer to Write and edit source code and TypeScript.

Create Angular components

With IntelliJ IDEA, you can create Angular components in several ways:

Use a predefined or custom live template.
Create a component folder with a bunch of related .ts, .html, and .css files.
Extract a component from a template using a dedicated refactoring.

Create a component using a predefined template

IntelliJ IDEA provides predefined live templates for creating Angular components, such as a-component, a-component-inline, and a-component-root.

Create an Angular component using a predefined code snippet

For more information about live templates, refer to Live templates.

To view a full list of predefined templates, open the Settings dialog (Ctrl+Alt+S) , go to Editor | Live Templates, and expand the Angular node.

In the editor, press Ctrl+J, select the appropriate template (for example, a-component) from the list, and then press Enter.
IntelliJ IDEA generates a component stub, places the caret at a field with canvas, and waits for you to specify the component name there. As you type the component name, the name of the selector and the template URL are filled in automatically in accordance with the Angular Style Guide.
If necessary, make the new component standalone using a the inspection pop-up.

Learn how to customize a template with variables from Using and Creating Code Snippets in WebStorm Blog.

Create a component folder

In IntelliJ IDEA, you can create a bunch of files for an Angular component in one action and even place them all in a separate folder. To do that, you need to use a file template with several child templates. When you create a file from the parent template, the related files from the child templates are generated automatically. For more information, refer to Templates with multiple files.

Suppose you want to create an example folder with a bunch of component files, for example, example.component.ts for logic, example.component.html for the template, and example.component.css for styles. You can create a file template with two parent templates so all the three files will be generated at once and placed in a separate folder.

In the Settings dialog (Ctrl+Alt+S) , select Editor | File and Code Templates.
First create a template for a TypeScript component file:
1. In the Files tab, click the Add button () on the toolbar.
  A new, Unnamed, template is added to the list.
2. In the right-hand pane, specify the template name, let it be Angular Component, and component.ts as the file extension.
3. In the File name field, type $NAME/$NAME.
4. Optionally, add a code template, for example:
  /* * Created by ${USER} on ${DATE} */ import { Component } from '@angular/core';
Click Apply.
Create a child template for the related HTML file:
1. Select the parent template Angular Component and click the Create Child Template File button on the toolbar.
  A child template is added below the Angular Component template.
2. In the right-hand pane, type $NAME/$NAME in the File name field and specify the component.html extension.
Click Apply.
Create a child template for the related Style Sheet.
1. Select the parent template Angular Component and click on the toolbar. A child template is added below the Angular Component template.
2. In the right-hand pane, type $NAME/$NAME in the File name field and specify the component.css extension.
Click OK to save the templates.
Create the component files.
From the context menu of the folder where you want to store the component files, select New | Angular Component. In the dialog that opens, specify the name that will be used for the folder and for the component files in it (example in this example).

Extract a component from a template

The Extract Angular component refactoring works by running ng generate component, taking schematic preferences inside your angular.json file into account.

In an HTML template file, select the code fragment that you want to extract into an Angular component.
From the context menu of the selection, choose Refactor | Extract Component.
Alternatively, press Ctrl+Alt+Shift+T and select Extract Component from the Refactor This popup.
In the dialog that opens, specify the name of the new component.

Angular signals

With IntelliJ IDEA, you can easily create Angular signals straight from signal, computed, and effect templates.

Create signals

Write the function you need. IntelliJ IDEA runs an inspection and highlights the new function as unresolved.
Hover over the highlighted function and click the Create signal '<function name>' link in the popup.
Alternatively, place the cursor at the highlighted function, press Alt+Enter, and select Create signal '<function name>'.
IntelliJ IDEA brings you to the component TypeScript file where a stub of the new signal is generated. Fill in the placeholders as necessary.

Configure highlighting for Angular signals

Press Ctrl+Alt+S to open the IDE settings and select Editor | Color Scheme | Angular Template.
Select Signal in the list and click the color indication next to Foreground.
Select the color you prefer and click Apply.

Navigate through an Angular application

When working on Angular projects you have to jump between different component files, such as TypeScript, template, and style files. To navigate around your code, you can use the following options:

Also, you can download the Angular CLI QuickSwitch plugin and install it on your computer.

To call the Related Symbol popup with a list of related files, perform one of the following actions:
- Press Ctrl+Alt+Home.
- Select Navigate | Related Symbol from the main menu.
- Right-click any area in the editor and select Go To | Related Symbol.
In a TypeScript component file, the popup also lists all the symbols that were imported into this file.
To open a file, select it and press Enter. Alternatively, use the numbers associated with each file type:
1. The TypeScript file with the component class
2. Template
3. Tests
4. Styles

Add new features with ng add

In projects that use Angular CLI 6 or later, you can use the Angular Dependency action to add new libraries. This action runs the ng add command which installs the dependency and updates the app with a special installation script. Note that not all libraries support installation with ng add.

Select File | New from the main menu or press Alt+Insert in the Project tool window, and then select Angular Dependency.
From the list, select the library to add. The list shows the libraries that can be definitely installed with ng add. To install a package that is not on the list, scroll to its end and double-click the Install package not listed above link, then specify the package name in the dialog that opens.
The list of packages that can be installed with ng add is available on GitHub.
Follow the steps of the wizard.
The example below illustrates adding Angular Material to a project.

If you manage dependencies manually through your package.json, IntelliJ IDEA still recognizes packages that support ng add. When you add such package to package.json, IntelliJ IDEA suggests installing it with ng add.

IntelliJ IDEA suggests adding a dependency with ng add

Generate code with Angular Schematics

IntelliJ IDEA can generate code using both schematics defined in libraries like @angular/material and those defined in Angular CLI itself.

Select File | New from the main menu or press Alt+Insert in the Project tool window, and then select Angular Schematic.
From the list, select the relevant schematic. Start typing the name of the schematics, the list shrinks as you type.
In the dialog that opens, specify the name of the schematic to be generated and additional options, if necessary. IntelliJ IDEA shows the description of the schematic and provides code completion and description for available options.

View parameter hints

In Angular HTML templates, Parameter hints show the names of parameters in methods and functions to make your code easier to read. By default, parameter hints are shown only for values that are literals or function expressions but not for named objects.

Configure parameter hints

Open the Settings dialog (Ctrl+Alt+S) and go to Editor | Inlay Hints.
Expand Angular HTML template under Parameter names.
Specify the context in which you want parameter hints shown by selecting the corresponding checkboxes.
The preview shows how the changes you make in the settings affect the code appearance.
For some methods and functions, IntelliJ IDEA does not show parameter hints in any context. Click Exclude list... to view these methods and functions, possibly enable parameter hints for them, or add new items to the list.
To hide parameter hints for any value type in any context, clear the Angular HTML template checkbox under Parameter names.

Confgure parameter hints in Angular templates

Inspect your code

IntelliJ IDEA brings a number of Angular-specific inspections that help you find errors as you edit your code and suggest quick-fixes for them.

In the example below, both a template and a templateUrl properties are used. IntelliJ IDEA detects the error, warns you about it, and suggests a quick-fix.

Angular inspection: duplicate properties

Another example shows how IntelliJ IDEA warns you about incorrect use of the *ngIf and *ngFor structural directives.

Angular inspection: incorrect use of structural directive

Angular-specific inspections help you identify improper usage of standalone components. In the example below, IntelliJ IDEA detects an import statement for a component that is not standalone and suggests a wiock-fix for the problem.

You may find it handy to use quick-fixes for creating @Input and @Output properties from Angular component templates, both with or without a transform property. Note that the required import statements are also generated automatically.

Quick-fix to generate @Input and @Output properties

IntelliJ IDEA also provides context-aware Create Field and Create Method intention actions that help you generate properly declared fields.

View the list of Angular-specific inspections and configure them

In the Settings dialog (Ctrl+Alt+S) , go to Editor | Inspections.
Expand the Angular node.
Configure inspection profiles and severity, disable and suppress predefined inspections, and create custom ones
as described in Code inspections.

Use Angular Material Design components

IntelliJ IDEA recognizes Angular Material components and attributes and provides coding assistance for them:

Completion for components
Completion for attributes
Navigation between a component or an attribute and its declaration (press Ctrl+B or select Go To | Declaration from the context menu).

Install Angular Material

Open the embedded Terminal (Alt+F12) and type ng add @angular/material.
Add "@angular/material": "^16.2.11" under dependencies in your package.json and run npm install.
In the main menu, go to File | New | Angular Dependency, then select @angular/material from the list and follow the steps of the wizard that starts.

Configure syntax highlighting

You can configure Angular-aware syntax highlighting according to your preferences and habits.

In the Settings dialog (Ctrl+Alt+S) , go to Editor | Color Scheme | Angular Template.
Select the color scheme, accept the highlighting settings inherited from the defaults or customize them as described in Colors and fonts.

Run and debug an Angular application

For applications created with Angular CLI in the IntelliJ IDEA New Project wizard as described above, IntelliJ IDEA generates two run/debug configurations with default settings:

An npm configuration with the default name Angular CLI Server. This configuration runs the ng serve command that launches the development server and starts your application in the development mode.
A JavaScript Debug configuration with the default name Angular Application. This configuration launches a debugging session.

If your application was created without using Angular CLI, you need to create an npm and a JavaScript Debug run/debug configurations with the actual settings, such as, host, port, etc., manually.

Run an Angular application

Select the Angular CLI Server run configuration from the list on the toolbar and click .
Alternatively, run npm start in the Terminal Alt+F12, or double-click the start task in the npm tool window (View | Tool Windows | npm), or click in the gutter next to the start script in package.json.
Wait till the application is compiled and the development server is ready.
The Run tool window or the Terminal shows the URL at which your application is running, by default it is http://localhost:4200/. Click this link to view the application.

Debug an Angular application

You can start a debugging session in different ways depending on how your application was created and where it is running.

If your application was created with Angular CLI, start a debugging session through an autogenerated Debug Application configuration. See Debug applications created with Angular CLI below.
If your application is running on localhost:4200, you can also start the debugger from the built-in Terminal or from the Run tool window. See Debug applications running on localhost below.
For debugging applications running on custom URLs, create a configuration of the type JavaScript Debug and specify the URL address at which your application is actually running. See Debug applications running on custom URLs below. This general workflow also works for applications running on localhost:4200 and for applications created with Angular CLI.

Debug applications created with Angular CLI

Set the breakpoints in your code.
Start the application in the development mode as described above and wait till the application is compiled and the development server is ready.
Select the autogenerated Angular Application configuration from the list and click next to it.
Alternatively, go to the Run tool window or the Terminal, hold Ctrl+Shift, and click this URL link.

Debug applications running on localhost

Set the breakpoints in your code.
Start the application in the development mode as described above and wait till the application is compiled and the development server is ready.
The Run tool window or the Terminal shows the URL at which your application is running, by default it is http://localhost:4200/. Hold Ctrl+Shift and click this URL link. IntelliJ IDEA starts a debugging session with an automatically generated Angular Application configuration of the type JavaScript Debug.
Alternatively, select the autogenerated Angular Application configuration from the list and click the Debug button next to the list.

Debug applications running on custom URLs

Set the breakpoints in your code.
Start the application in the development mode as described above and wait till the application is compiled and the Webpack development server is ready.
The Run tool window or the Terminal shows the URL at which your application is running. Copy this URL address, you will later specify it in a debug configuration. To view your application, just click the link.
Create a JavaScript Debug configuration. To do that, go to Run | Edit Configurations in the main menu, click , and select JavaScript Debug from the list. In the Run/Debug Configuration: JavaScript Debug dialog, paste the saved URL in the URL field and save the configuration.
To launch your newly created configuration, select it from the list of configurations and click next to the list.

When the first breakpoint is hit, switch to the Debug tool window and proceed as usual: step through the program, stop and resume program execution, examine it when suspended, explore the call stack and variables, set watches, evaluate variables, view actual HTML DOM, and so on.

Troubleshooting for Node.js 17+

If you are using Node.js version 17 or later, during a debugging session you may face network connectivity issues that result in problems with attaching the debugger or with loading sourcemaps.

The workaround is to pass --host 127.0.0.1 to the server by updating the start script in your package.json as follows:

"start": "ng serve --host=127.0.0.1"

Last modified: 11 February 2024